You searched for subject:(Wireless communication systems ).
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University of Johannesburg
1.
Van Rooyen, Pieter Gert Wessel.
Maximum entropy based analysis of a DS/SSMA diversity system.
Degree: 2014, University of Johannesburg
URL: http://hdl.handle.net/10210/9334 
► D.Ing.
This thesis sets out to propose and analyze a cellular Direct Sequence Spread Spectrum Multiple Access (DSjSSMA) system for the Indoor Wireless Communication (IWC)…
(more)
▼ D.Ing.
This thesis sets out to propose and analyze a cellular Direct Sequence Spread Spectrum Multiple Access (DSjSSMA) system for the Indoor Wireless Communication (IWC) Nakagami fading channel. The up- and downlink of the system implement Differential Phase Shift Keying (DPSK) and Coherent Phase Shift Keying (CPSK) as modulation schemes respectively, and are analyzed using Maximum Entropy (MaxEnt) principles due to its reliability and accuracy. As a means to enhance system capacity and performance, different forms of diversity are investigated; for the up- and downlink, respectively, RAKE reception and Maximum Ratio Combining (MRC) diversity together with Forward Error Control (FEC) coding are assumed. Further, the validity of the Gaussian Assumption (GA) is quantified and investigated under fading and non-fading conditions by calculating the missing information, using Minimum Relative Entropy (MRE) principles between the Inter- User Interference (IUI) distribution and a Gaussian distribution of equal variance.
Subjects/Keywords: Wireless communication systems
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APA (6th Edition):
Van Rooyen, P. G. W. (2014). Maximum entropy based analysis of a DS/SSMA diversity system. (Thesis). University of Johannesburg. Retrieved from http://hdl.handle.net/10210/9334
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Van Rooyen, Pieter Gert Wessel. “Maximum entropy based analysis of a DS/SSMA diversity system.” 2014. Thesis, University of Johannesburg. Accessed June 18, 2019.
http://hdl.handle.net/10210/9334.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Van Rooyen, Pieter Gert Wessel. “Maximum entropy based analysis of a DS/SSMA diversity system.” 2014. Web. 18 Jun 2019.
Vancouver:
Van Rooyen PGW. Maximum entropy based analysis of a DS/SSMA diversity system. [Internet] [Thesis]. University of Johannesburg; 2014. [cited 2019 Jun 18].
Available from: http://hdl.handle.net/10210/9334.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Van Rooyen PGW. Maximum entropy based analysis of a DS/SSMA diversity system. [Thesis]. University of Johannesburg; 2014. Available from: http://hdl.handle.net/10210/9334
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Johannesburg
2.
Swarts, Jacobus Stephanus.
Aspects of multipath channel characterization.
Degree: 2012, University of Johannesburg
URL: http://hdl.handle.net/10210/6088
► M.Ing.
In this thesis we investigated the characterization of wireless communication channels. The characterization of the channel itself focused on the analog as well as…
(more)
▼ M.Ing.
In this thesis we investigated the characterization of wireless communication channels. The characterization of the channel itself focused on the analog as well as the discrete domains. This was done to provide a more complete treatment than that which is usually found in the literature (which normally focuses" on either one of the domains). We also provide a discussion on the basic issues that arise when trying to characterize a wireless communication channel. The analog characterization proceeded by means of the impulse response of the chan nel. We calculated the scattering function of the channel as well as the Delay and Doppler Power Spectra. From the wideband data we also derived the equivalent Narrowband en velope and phase and investigated the probability density functions of these. We also implemented the GMSK modulation scheme, used in the GSM system, in software. This included a simulation of the additive white Gaussian noise channel as well as the Rayleigh fading channel, the two most common assumed models. A complete discussion is provided on this implementation. The implementation above was used to obtain discrete channel models of GMSK on a Rayleigh fading channel. This also provided us with the opportunity to compare the performance of three of the most common discrete channel models : the Gilbert model, the Gilbert-Elliott model and the Fritchman model. Lastly we obtained equations that describe the behaviour of the Gilbert model's parameters as a function of average signal to-noise ratio.
Subjects/Keywords: Wireless communication systems
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APA (6th Edition):
Swarts, J. S. (2012). Aspects of multipath channel characterization. (Thesis). University of Johannesburg. Retrieved from http://hdl.handle.net/10210/6088
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Swarts, Jacobus Stephanus. “Aspects of multipath channel characterization.” 2012. Thesis, University of Johannesburg. Accessed June 18, 2019.
http://hdl.handle.net/10210/6088.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Swarts, Jacobus Stephanus. “Aspects of multipath channel characterization.” 2012. Web. 18 Jun 2019.
Vancouver:
Swarts JS. Aspects of multipath channel characterization. [Internet] [Thesis]. University of Johannesburg; 2012. [cited 2019 Jun 18].
Available from: http://hdl.handle.net/10210/6088.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Swarts JS. Aspects of multipath channel characterization. [Thesis]. University of Johannesburg; 2012. Available from: http://hdl.handle.net/10210/6088
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Rutgers University
3.
Daya, Ronak, 1985-.
Virtual network traffic shaping (VNTS) technique to ensure fairness in virtual WiMax networks:.
Degree: MS, Electrical and Computer Engineering, 2009, Rutgers University
URL: http://hdl.rutgers.edu/1782.2/rucore10001600001.ETD.000051805
► This thesis presents the results of an experimental study on wireless network virtualization. The design and evaluation of virtualization methods for a WiMAX base station,…
(more)
▼ This thesis presents the results of an experimental study on
wireless network virtualization. The design and evaluation of virtualization methods for a WiMAX base station, a
wireless technology of growing importance for emerging “4G” wide-area data services is performed using an experimental WiMAX base station which has recently been deployed at WINLAB, Rutgers University as part of the national GENI experimental network for future Internet research. The goal of this project was to benchmark the performance of this WiMAX base station with and without virtualization over a range of realistic scenarios, and to evaluate methods for improving fairness and isolation between virtual networks in the system under study.
A set of mobile client experiments (without virtualization) show that the base station is capable of operating at peak rates of around 16 Mbps indoors, and that the achievable bit-rate at a mobile client varies considerably as a function of received signal strength (RSSI) at the mobile client. The next step was to perform virtualization of this device, using Kernel Virtual Machine (KVM); with multiple slices having the ability to share the same base station. Experimental results are performed for multiple virtual networks operating in realistic scenarios with varying received signal strength at mobile devices. The results show that virtual networks can have significant coupling between their throughput performance, and that unfairness is further amplified by autorate and scheduling algorithms in the WiMAX base station, which have the effect of moving resources to mobile clients with low signal-to-noise ratio.
As a solution to the above mentioned problem, a Virtual Network Traffic Shaping (VNTS) technique is proposed and evaluated. An algorithm is developed using feedback from the base station’s control interface to assess the current channel utilization for each slice. A control parameter in the form of downlink data rate is defined and this value is regulated dynamically for each slice, using an implementation of the Click Modular Router in order to maintain fairness across slices. The VNTS auto-reconfigures itself and imposes fairness at pre-set time intervals. We evaluate the performance of this mechanism and compare it to the initial results that were observed for the uncontrolled scenario. Preliminary results indicate that the VNTS scheme effectively implements fairness, and helps to reduce the coupling between slices.
Advisors/Committee Members: Daya, Ronak, 1985- (author), Raychaudhuri, Dipankar (chair), Marsic, Ivan (internal member), Gruteser, Marco (internal member).
Subjects/Keywords: Wireless communication systems; Mobile communication systems
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APA (6th Edition):
Daya, Ronak, 1. (2009). Virtual network traffic shaping (VNTS) technique to ensure fairness in virtual WiMax networks:. (Masters Thesis). Rutgers University. Retrieved from http://hdl.rutgers.edu/1782.2/rucore10001600001.ETD.000051805
Chicago Manual of Style (16th Edition):
Daya, Ronak, 1985-. “Virtual network traffic shaping (VNTS) technique to ensure fairness in virtual WiMax networks:.” 2009. Masters Thesis, Rutgers University. Accessed June 18, 2019.
http://hdl.rutgers.edu/1782.2/rucore10001600001.ETD.000051805.
MLA Handbook (7th Edition):
Daya, Ronak, 1985-. “Virtual network traffic shaping (VNTS) technique to ensure fairness in virtual WiMax networks:.” 2009. Web. 18 Jun 2019.
Vancouver:
Daya, Ronak 1. Virtual network traffic shaping (VNTS) technique to ensure fairness in virtual WiMax networks:. [Internet] [Masters thesis]. Rutgers University; 2009. [cited 2019 Jun 18].
Available from: http://hdl.rutgers.edu/1782.2/rucore10001600001.ETD.000051805.
Council of Science Editors:
Daya, Ronak 1. Virtual network traffic shaping (VNTS) technique to ensure fairness in virtual WiMax networks:. [Masters Thesis]. Rutgers University; 2009. Available from: http://hdl.rutgers.edu/1782.2/rucore10001600001.ETD.000051805
University of Oklahoma
4.
Shahriar, Abu Zafar.
Evaluation of Network Mobility Schemes for Terrestrial and Satellite Networks.
Degree: PhD, 2012, University of Oklahoma
URL: http://hdl.handle.net/11244/319493
networks by selecting and extending optimal route optimization schemes, and presenting new architecture and protocol.
Advisors/Committee Members: Atiquzzaman, Mohammed (advisor).Subjects/Keywords: Wireless communication systems; Mobile communication systems; Telecommunication
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APA ·
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APA (6th Edition):
Shahriar, A. Z. (2012). Evaluation of Network Mobility Schemes for Terrestrial and Satellite Networks. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/319493
Chicago Manual of Style (16th Edition):
Shahriar, Abu Zafar. “Evaluation of Network Mobility Schemes for Terrestrial and Satellite Networks.” 2012. Doctoral Dissertation, University of Oklahoma. Accessed June 18, 2019.
http://hdl.handle.net/11244/319493.
MLA Handbook (7th Edition):
Shahriar, Abu Zafar. “Evaluation of Network Mobility Schemes for Terrestrial and Satellite Networks.” 2012. Web. 18 Jun 2019.
Vancouver:
Shahriar AZ. Evaluation of Network Mobility Schemes for Terrestrial and Satellite Networks. [Internet] [Doctoral dissertation]. University of Oklahoma; 2012. [cited 2019 Jun 18].
Available from: http://hdl.handle.net/11244/319493.
Council of Science Editors:
Shahriar AZ. Evaluation of Network Mobility Schemes for Terrestrial and Satellite Networks. [Doctoral Dissertation]. University of Oklahoma; 2012. Available from: http://hdl.handle.net/11244/319493
University of Oklahoma
5.
Shahriar, Abu Zafar.
Evaluation of Network Mobility Schemes for Terrestrial and Satellite Networks.
Degree: PhD, 2012, University of Oklahoma
URL: http://hdl.handle.net/11244/318543
networks by selecting and extending optimal route optimization schemes, and presenting new architecture and protocol.
Advisors/Committee Members: Atiquzzaman, Mohammed (advisor).Subjects/Keywords: Wireless communication systems; Mobile communication systems; Telecommunication
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APA ·
Chicago ·
MLA ·
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CSE |
Export
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Manager
APA (6th Edition):
Shahriar, A. Z. (2012). Evaluation of Network Mobility Schemes for Terrestrial and Satellite Networks. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/318543
Chicago Manual of Style (16th Edition):
Shahriar, Abu Zafar. “Evaluation of Network Mobility Schemes for Terrestrial and Satellite Networks.” 2012. Doctoral Dissertation, University of Oklahoma. Accessed June 18, 2019.
http://hdl.handle.net/11244/318543.
MLA Handbook (7th Edition):
Shahriar, Abu Zafar. “Evaluation of Network Mobility Schemes for Terrestrial and Satellite Networks.” 2012. Web. 18 Jun 2019.
Vancouver:
Shahriar AZ. Evaluation of Network Mobility Schemes for Terrestrial and Satellite Networks. [Internet] [Doctoral dissertation]. University of Oklahoma; 2012. [cited 2019 Jun 18].
Available from: http://hdl.handle.net/11244/318543.
Council of Science Editors:
Shahriar AZ. Evaluation of Network Mobility Schemes for Terrestrial and Satellite Networks. [Doctoral Dissertation]. University of Oklahoma; 2012. Available from: http://hdl.handle.net/11244/318543
Ryerson University
6.
Kohn, Adam.
Multi-Channel Wireless Mesh Networks With TCP Proxies.
Degree: 2010, Ryerson University
URL: https://digital.library.ryerson.ca/islandora/object/RULA%3A2031
► Wireless mesh networks based on 802.11 technology could potentially be an inexpensive means of constructing large-scale wireless infrastructure networks. Wireless mesh networks attempt to capitalize…
(more)
▼ Wireless mesh networks based on 802.11 technology could potentially be an inexpensive means of constructing large-scale
wireless infrastructure networks.
Wireless mesh networks attempt to capitalize on multiple hop
communication to achieve transmissions over relatively larger distances. One fundamental concern is that multi-hop
wireless networks may suffer heavily from co-channel interference. If multiple channels from the 802.11 spectrum are employed across adjacent links of
communication, the interference effects can be mitigated. In practice, either overlapping channels or independent orthogonal channels can be assigned to the different links with varying effects. Topology control can be used to help manage these channels to limit the interference effects while providing for the necessary capacity and scalability requirements. By means of analyses and testbed experiments, I have validated that the introduction of multiple channels can improve overall system performance. With respect to the end-users, end-to-end performance over multiple
wireless hops should be the primary concern. Under UDP-based
communication sessions, network congestion is not the main contributor to transport layer performance degradation. Upon further investigation, TCP performance degrades exponentially with hop count, because it incorrectly interprets lost packets as a sigh of network congestion. Since TCP performance weakens for connections with more
wireless hops, I further evaluate if network performance can be improved by adding an n-hop TCP proxy service. These proxies have the effect of breaking long connections into shorter connections with tighter transport layer control. A trade-off between the number of proxies and the hop count between proxies becomes evident through testbed evaluation. Analyzing various mesh characteristics and the relationships between MAC and transport layers can help establish a suitable protocol for future work.
Advisors/Committee Members: Ryerson University (Degree grantor).
Subjects/Keywords: Wireless communication systems; Wireless communication systems – Computer simulation; Wireless communication systems – Evaluation
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APA (6th Edition):
Kohn, A. (2010). Multi-Channel Wireless Mesh Networks With TCP Proxies. (Thesis). Ryerson University. Retrieved from https://digital.library.ryerson.ca/islandora/object/RULA%3A2031
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Kohn, Adam. “Multi-Channel Wireless Mesh Networks With TCP Proxies.” 2010. Thesis, Ryerson University. Accessed June 18, 2019.
https://digital.library.ryerson.ca/islandora/object/RULA%3A2031.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kohn, Adam. “Multi-Channel Wireless Mesh Networks With TCP Proxies.” 2010. Web. 18 Jun 2019.
Vancouver:
Kohn A. Multi-Channel Wireless Mesh Networks With TCP Proxies. [Internet] [Thesis]. Ryerson University; 2010. [cited 2019 Jun 18].
Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A2031.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kohn A. Multi-Channel Wireless Mesh Networks With TCP Proxies. [Thesis]. Ryerson University; 2010. Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A2031
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of KwaZulu-Natal
7.
[No author].
Traffic modelling and analysis of next generation networks.
Degree: Electronic engineering, 2008, University of KwaZulu-Natal
URL: http://hdl.handle.net/10413/688
► Wireless communication systems have demonstrated tremendous growth over the last decade, and this growth continues unabated worldwide. The networks have evolved from analogue based first…
(more)
▼ Wireless communication systems have demonstrated tremendous growth over the last decade,
and this growth continues unabated worldwide. The networks have evolved from analogue
based first generation
systems to third generation
systems and further. We are envisaging a
Next Generation Network (NGN) that should deliver anything anywhere anytime, with full
quality of service (QoS) guarantees. Delivering anything anywhere anytime is a challenge that
is a focus for many researchers. Careful teletraffic design is required for this ambitious project
to be realized. This research goes through the protocol choices, design factors, performance
measures and the teletraffic analysis, necessary to make the project feasible.
The first significant contribution of this thesis is the development of a Call Admission Control
(CAC) model as a means of achieving QoS in the NGN’s. The proposed CAC model uses an
expanded set of admission control parameters. The existing CAC schemes focus on one major
QoS parameter for CAC; the Code Division Multiple Access (CDMA) based models focus on
the signal to interference ratio (SIR) while the Asynchronous Transfer Mode (ATM) based
models focus on delay. A key element of NGN’s is inter-working of many protocols and
hence the need for a diverse set of admission control parameters. The developed CAC
algorithm uses an expanded set of admission control parameters (SIR, delay, etc). The
admission parameters can be generalized as broadly as the design engineer might require for a
particular traffic class without rendering the analysis intractable.
The second significant contribution of this thesis is the presentation of a complete teletraffic
analytical model for an NGN. The NGN network features the following issues; firstly, NGN
call admission control algorithm, with expanded admission control parameters; secondly,
multiple traffic types, with their diverse demands; thirdly, the NGN protocol issues such as
CDMA’s soft capacity and finally, scheduling on both the wired and
wireless links. A full
teletraffic analysis with all analytical challenges is presented. The analysis shows that an
NGN teletraffic model with more traffic parameters performs better than a model with less
traffic parameters.
The third contribution of the thesis is the extension of the model to traffic arrivals that are not
purely Markovian. This work presents a complete teletraffic analytical model with Batch
Markovian Arrival (BMAP) traffic statistics unlike the conventional Markovian types. The
Markovian traffic models are deployed for analytical simplicity at the expense of realistic
traffic types. With CAC, the BMAP processes become non-homogeneous. The analysis of
homogeneous BMAP process is extended to non-homogeneous processes for the teletraffic
model in this thesis. This is done while incorporating all the features of the NGN network.
A feasible analytical model for an NGN must combine factors from all the areas of the
protocol stack. Most models only consider the physical layer issues such as…
Advisors/Committee Members: Takawira, Fambirai (advisor).
Subjects/Keywords: Wireless communication systems.;
Electronic engineering.
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APA (6th Edition):
author], [. (2008). Traffic modelling and analysis of next generation networks.
(Thesis). University of KwaZulu-Natal. Retrieved from http://hdl.handle.net/10413/688
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
author], [No. “Traffic modelling and analysis of next generation networks.
” 2008. Thesis, University of KwaZulu-Natal. Accessed June 18, 2019.
http://hdl.handle.net/10413/688.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
author], [No. “Traffic modelling and analysis of next generation networks.
” 2008. Web. 18 Jun 2019.
Vancouver:
author] [. Traffic modelling and analysis of next generation networks.
[Internet] [Thesis]. University of KwaZulu-Natal; 2008. [cited 2019 Jun 18].
Available from: http://hdl.handle.net/10413/688.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
author] [. Traffic modelling and analysis of next generation networks.
[Thesis]. University of KwaZulu-Natal; 2008. Available from: http://hdl.handle.net/10413/688
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
8.
Al-Sherbaz, Ali.
WiMAX-WiFi techniques for baseband convergence and routing protocols.
Degree: PhD, 2010, University of Buckingham
URL: http://nectar.northampton.ac.uk/4241/
;
http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.544129
► The focus of this study was to investigate solutions that, when implemented in any heterogeneous wireless network, shall enhance the existing standard and routing protocol…
(more)
▼ The focus of this study was to investigate solutions that, when implemented in any heterogeneous wireless network, shall enhance the existing standard and routing protocol connectivity without impacting the standard or changing the wireless transceiver’s functions. Thus achieving efficient interoperability at much reduced overheads. The techniques proposed in this research are centred on the lower layers. This because of the facts that WiMax and WiFi standards have not addressed the backward compatibility of the two technologies at the MAC and PHY layers, for both the baseband functions as well as the routing IP addresses. This thesis describes two innovate techniques submitted for a PhD degree. The first technique is to combine WiMax and WiFi signals so to utilise the same "baseband implementation chain" to handle both of these technologies, thus insuring ubiquitous data communication. WiMax-WiFi Baseband Convergence (W2BC) implementation is proposed to offer an optimum configurable solution targeted at combining the 802.16d WiMax and the 802.11a WiFi technologies. This approach provides a fertile ground for future work into combining more OFDM based wireless technologies. Based on analysis and simulation, the W2BC can achieve saving in device cost, size, power consumption and implementation complexity when compared to current side-by-side implementations for these two technologies. The second technique, called "Prime-IP", can be implemented with, and enhance, any routing protocol. During the route discovery process, Prime-IP enables any node on a wireless mesh network (WMN) to dynamically select the best available route on the network. Prime-IP proposes a novel recursive process, based on prime numbers addressing, to accumulate knowledge for nodes beyond the “neighbouring nodes”, and to determine the sequence of all the “intermediate nodes” used to form the route
Subjects/Keywords: 621.382; TK5103.2 Wireless communication systems
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Manager
APA (6th Edition):
Al-Sherbaz, A. (2010). WiMAX-WiFi techniques for baseband convergence and routing protocols. (Doctoral Dissertation). University of Buckingham. Retrieved from http://nectar.northampton.ac.uk/4241/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.544129
Chicago Manual of Style (16th Edition):
Al-Sherbaz, Ali. “WiMAX-WiFi techniques for baseband convergence and routing protocols.” 2010. Doctoral Dissertation, University of Buckingham. Accessed June 18, 2019.
http://nectar.northampton.ac.uk/4241/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.544129.
MLA Handbook (7th Edition):
Al-Sherbaz, Ali. “WiMAX-WiFi techniques for baseband convergence and routing protocols.” 2010. Web. 18 Jun 2019.
Vancouver:
Al-Sherbaz A. WiMAX-WiFi techniques for baseband convergence and routing protocols. [Internet] [Doctoral dissertation]. University of Buckingham; 2010. [cited 2019 Jun 18].
Available from: http://nectar.northampton.ac.uk/4241/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.544129.
Council of Science Editors:
Al-Sherbaz A. WiMAX-WiFi techniques for baseband convergence and routing protocols. [Doctoral Dissertation]. University of Buckingham; 2010. Available from: http://nectar.northampton.ac.uk/4241/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.544129
Oregon State University
9.
Chen, Deyan.
PAPR Reduction of Optical OFDM Systems with Exponential Companding Transform and Zero Padding.
Degree: MS, Electrical and Computer Engineering, 2016, Oregon State University
URL: http://hdl.handle.net/1957/58553
► Optical wireless communication (OWC) is an alternative to radio frequency (RF)communication with a signi cantly larger and unregulated spectrum. In OWC systems, optical orthogonal frequency…
(more)
▼ Optical
wireless communication (OWC) is an alternative to radio frequency (RF)
communication with a signi cantly larger and unregulated spectrum. In OWC
systems, optical orthogonal frequency division multiplexing (O-OFDM) with intensity modulation and direct detection (IM/DD) is commonly used. There are two common signal structures in most OWC
systems based on IM/DD OFDM. One is called DC-biased optical OFDM (DCO-OFDM) and the other one is called asymmetrically clipped optical OFDM (ACO-OFDM). One drawback of an OFDM signal is its high peak-to-average power ratio (PAPR), which requires the transmitter to operate in a large dynamic range to retain all desirable information. To reduce the PAPR,companding transform has been investigated. Because of the nonlinear operation of companding, a high electrical signal-to-noise ratio (SNR) is required. In this thesis, a combination of an exponential companding transform and a zero padding scheme is employed on both DCO-OFDM and ACO-OFDM
systems to reduce PAPR and the required electrical SNR.
Systems that employ quadrature amplitude modulation (QAM) with gray mapping are simulated. Results have shown that the optimized DCO-OFDM and ACO-OFDM reduced the PAPR by about 7dB and 11dB, respectively, through exponential companding. Meanwhile, the required SNR is decreased by approximately 10dB in the optimized DCO-OFDM and by approximately 13dB in the optimized ACO-OFDM by using zero padding.
Advisors/Committee Members: Liu, Huaping (advisor), Nguyen, Thinh (committee member).
Subjects/Keywords: PAPR; Wireless communication systems
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Manager
APA (6th Edition):
Chen, D. (2016). PAPR Reduction of Optical OFDM Systems with Exponential Companding Transform and Zero Padding. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/58553
Chicago Manual of Style (16th Edition):
Chen, Deyan. “PAPR Reduction of Optical OFDM Systems with Exponential Companding Transform and Zero Padding.” 2016. Masters Thesis, Oregon State University. Accessed June 18, 2019.
http://hdl.handle.net/1957/58553.
MLA Handbook (7th Edition):
Chen, Deyan. “PAPR Reduction of Optical OFDM Systems with Exponential Companding Transform and Zero Padding.” 2016. Web. 18 Jun 2019.
Vancouver:
Chen D. PAPR Reduction of Optical OFDM Systems with Exponential Companding Transform and Zero Padding. [Internet] [Masters thesis]. Oregon State University; 2016. [cited 2019 Jun 18].
Available from: http://hdl.handle.net/1957/58553.
Council of Science Editors:
Chen D. PAPR Reduction of Optical OFDM Systems with Exponential Companding Transform and Zero Padding. [Masters Thesis]. Oregon State University; 2016. Available from: http://hdl.handle.net/1957/58553
Hong Kong University of Science and Technology
10.
Wang, Jiaheng.
Robust designs for wireless communication systems.
Degree: 2010, Hong Kong University of Science and Technology
URL: https://doi.org/10.14711/thesis-b1114881
;
http://repository.ust.hk/ir/bitstream/1783.1-7017/1/th_redirect.html
► During the past decades, there has been an increasing demand of high-rate services to be supported by wireless communications. Among different solutions that have been…
(more)
▼ During the past decades, there has been an increasing demand of high-rate services to be supported by wireless communications. Among different solutions that have been proposed to meet this demand, the utilization of multiple antennas, which leads to multi-input multi-output (MIMO) transmissions, arises as one of the best candidates. Fundamentally, MIMO channels constitute a unified way to model a wide range of different physical channels, for example wireless multi-antenna channels and wireline Digital Subscriber Line (DSL) channels. The full potential of MIMO channels is achieved by exploring the channel state information (CSI). It is well known that the performance of MIMO systems depends, to a substantial extent, on the quantity and quality of CSI that is available at the communication ends. However, in wireless communications, CSI, especially CSI at the transmitter (CSIT), is seldom perfectly known, due to many issues such as estimation or feedback errors. Therefore, a practical MIMO system must utilize CSI and at the same time has the ability to combat against the imperfectness of CSI, or, in other words, is robust to imperfect CSI. In this thesis, we apply the philosophy of worst-case robustness, which originates from robust optimization in mathematical programming, to designing wireless communication systems, especially MIMO systems. Firstly, we focus on designing robust transmit strategies for a MIMO link by optimizing the worst-case received signal-to-noise ratio (SNR) or the error probability if a space-time block code (STBC) is used. The attention is not only on finding the numerical solutions to the formulated maximin and quality-of-service (QoS) problems through convex optimization, but also on searching the optimal transmit directions of the robust precoder, which lead to a closed-form solution that provides important insights. Secondly, we investigate the robustness of beamforming, a simple strategy that transmits data along only one spatial direction. Because of its simplicity, beamforming has been doubted to be sensitive to inaccuracies of CSIT. However, we show, from the perspective of worst-case robustness, that beamforming is actually robust in some sense, and thus has the ability to combat against the imperfectness of CSIT, especially when channel dimensions or channel errors are small. Thirdly, we design robust precoders for MIMO communication systems with pre-fixed receivers under the minimum mean square error (MMSE) criterion. Different types of CSI are taken into account through either the stochastic model or the deterministic (worst-case) model. Our focus is on the worst-case robust design. The optimal transmit directions are found in all considered situations, hence simplifying the matrix-valued problems to scalar power allocations problems, for which either closed-form solutions or efficient numerical methods are provided. Finally, we consider a robust design of a cognitive radio (CR) system, consisting of multiple primary users (PUs) and multiple secondary users (SUs) over either…
Subjects/Keywords: Wireless communication systems; Robust control
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
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APA (6th Edition):
Wang, J. (2010). Robust designs for wireless communication systems. (Thesis). Hong Kong University of Science and Technology. Retrieved from https://doi.org/10.14711/thesis-b1114881 ; http://repository.ust.hk/ir/bitstream/1783.1-7017/1/th_redirect.html
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Wang, Jiaheng. “Robust designs for wireless communication systems.” 2010. Thesis, Hong Kong University of Science and Technology. Accessed June 18, 2019.
https://doi.org/10.14711/thesis-b1114881 ; http://repository.ust.hk/ir/bitstream/1783.1-7017/1/th_redirect.html.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Wang, Jiaheng. “Robust designs for wireless communication systems.” 2010. Web. 18 Jun 2019.
Vancouver:
Wang J. Robust designs for wireless communication systems. [Internet] [Thesis]. Hong Kong University of Science and Technology; 2010. [cited 2019 Jun 18].
Available from: https://doi.org/10.14711/thesis-b1114881 ; http://repository.ust.hk/ir/bitstream/1783.1-7017/1/th_redirect.html.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Wang J. Robust designs for wireless communication systems. [Thesis]. Hong Kong University of Science and Technology; 2010. Available from: https://doi.org/10.14711/thesis-b1114881 ; http://repository.ust.hk/ir/bitstream/1783.1-7017/1/th_redirect.html
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Hong Kong
11.
Huang, Wen.
Opportunistic scheduling in wireless data
networks.
Degree: PhD, 2011, University of Hong Kong
URL: Huang,
W.
[黄文].
(2011).
Opportunistic
scheduling
in
wireless
data
networks.
(Thesis).
University
of
Hong
Kong,
Pokfulam,
Hong
Kong
SAR.
Retrieved
from
http://dx.doi.org/10.5353/th_b4589523
;
http://dx.doi.org/10.5353/th_b4589523
;
http://hdl.handle.net/10722/134086
published_or_final_version
Electrical and Electronic
Engineering
Doctoral
Doctor of Philosophy
Advisors/Committee Members: Yeung, LK.Subjects/Keywords: Wireless communication systems.; Computer scheduling.
Record Details
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Record Details
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Huang, W. (2011). Opportunistic scheduling in wireless data
networks. (Doctoral Dissertation). University of Hong Kong. Retrieved from Huang, W. [黄文]. (2011). Opportunistic scheduling in wireless data networks. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b4589523 ; http://dx.doi.org/10.5353/th_b4589523 ; http://hdl.handle.net/10722/134086
Chicago Manual of Style (16th Edition):
Huang, Wen. “Opportunistic scheduling in wireless data
networks.” 2011. Doctoral Dissertation, University of Hong Kong. Accessed June 18, 2019.
Huang, W. [黄文]. (2011). Opportunistic scheduling in wireless data networks. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b4589523 ; http://dx.doi.org/10.5353/th_b4589523 ; http://hdl.handle.net/10722/134086.
MLA Handbook (7th Edition):
Huang, Wen. “Opportunistic scheduling in wireless data
networks.” 2011. Web. 18 Jun 2019.
Vancouver:
Huang W. Opportunistic scheduling in wireless data
networks. [Internet] [Doctoral dissertation]. University of Hong Kong; 2011. [cited 2019 Jun 18].
Available from: Huang, W. [黄文]. (2011). Opportunistic scheduling in wireless data networks. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b4589523 ; http://dx.doi.org/10.5353/th_b4589523 ; http://hdl.handle.net/10722/134086.
Council of Science Editors:
Huang W. Opportunistic scheduling in wireless data
networks. [Doctoral Dissertation]. University of Hong Kong; 2011. Available from: Huang, W. [黄文]. (2011). Opportunistic scheduling in wireless data networks. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b4589523 ; http://dx.doi.org/10.5353/th_b4589523 ; http://hdl.handle.net/10722/134086
University of Hong Kong
12.
Zhou, Haojie.
Auction-based resource allocation in selfish
networks.
Degree: PhD, 2014, University of Hong Kong
URL: Zhou,
H.
[周豪杰].
(2014).
Auction-based
resource
allocation
in
selfish
networks.
(Thesis).
University
of
Hong
Kong,
Pokfulam,
Hong
Kong
SAR.
Retrieved
from
http://dx.doi.org/10.5353/th_b5328038
;
http://dx.doi.org/10.5353/th_b5328038
;
http://hdl.handle.net/10722/206758
► Networks function properly only when nodes cooperate to provide service. In many networks, such as ad hoc and interdomain networks, network devices are deployed by…
(more)
▼ Networks function properly only when nodes
cooperate to provide service. In many networks, such as ad hoc and
interdomain networks, network devices are deployed by different
owners. Due to limited communication resources, nodes in such
networks may behave selfishly. That is, they are only interested in
maximizing their own utilities, leading to selfish networks.
Incentives are required in such networks to stimulate cooperation.
In wired selfish networks, existing work mainly focuses on traffic
assignment among predetermined available paths for one source and
destination pair. In wireless selfish networks, available bandwidth
is assumed to be fixed and predetermined, and the interferences
among flows are ignored. Resource allocation in selfish networks
needs to be developed under more general models. This dissertation
has devised general analytical models for bandwidth allocation in
wired and wireless selfish networks. Based on the analogy between
resource allocation in selfish networks and auction, auction theory
has been adopted in the design and analysis of resource allocation
schemes. With incentives introduced in the schemes, selfish nodes
will follow the prescribed algorithm and report their information
truthfully so that the system cost is minimized.
I firstly propose
a general model for bandwidth allocation in wired selfish networks.
Bandwidth requirements of call routing requests in a given period
are allocated as a batch and satisfied at the end of the period.
Then, a centralized mechanism is designed to allocate bandwidth and
determine payments with different sequencing strategies. Some
properties of the mechanism such as individual rationality and
incentive-compatibility are studied.
I go on to develop the
distributed algorithm in wired selfish networks. Available paths
are no longer assumed to be fixed and predetermined. Destination
nodes conduct the sub-auctions in a certain order for bandwidth
allocation and determine payments in a distributed manner.
Truthfulness of the distributed mechanism is guaranteed under Nash
equilibrium. This distributed mechanism, as a more scalable
solution to allocate bandwidth in wired selfish networks, can still
guarantee the performance achieved by existing
work.
published_or_final_version
Electrical and Electronic
Engineering
Doctoral
Doctor of Philosophy
Advisors/Committee Members: Leung, KC, Li, VOK.
Subjects/Keywords: Wireless communication systems; Resource allocation
Record Details
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Record Details
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Zhou, H. (2014). Auction-based resource allocation in selfish
networks. (Doctoral Dissertation). University of Hong Kong. Retrieved from Zhou, H. [周豪杰]. (2014). Auction-based resource allocation in selfish networks. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b5328038 ; http://dx.doi.org/10.5353/th_b5328038 ; http://hdl.handle.net/10722/206758
Chicago Manual of Style (16th Edition):
Zhou, Haojie. “Auction-based resource allocation in selfish
networks.” 2014. Doctoral Dissertation, University of Hong Kong. Accessed June 18, 2019.
Zhou, H. [周豪杰]. (2014). Auction-based resource allocation in selfish networks. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b5328038 ; http://dx.doi.org/10.5353/th_b5328038 ; http://hdl.handle.net/10722/206758.
MLA Handbook (7th Edition):
Zhou, Haojie. “Auction-based resource allocation in selfish
networks.” 2014. Web. 18 Jun 2019.
Vancouver:
Zhou H. Auction-based resource allocation in selfish
networks. [Internet] [Doctoral dissertation]. University of Hong Kong; 2014. [cited 2019 Jun 18].
Available from: Zhou, H. [周豪杰]. (2014). Auction-based resource allocation in selfish networks. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b5328038 ; http://dx.doi.org/10.5353/th_b5328038 ; http://hdl.handle.net/10722/206758.
Council of Science Editors:
Zhou H. Auction-based resource allocation in selfish
networks. [Doctoral Dissertation]. University of Hong Kong; 2014. Available from: Zhou, H. [周豪杰]. (2014). Auction-based resource allocation in selfish networks. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b5328038 ; http://dx.doi.org/10.5353/th_b5328038 ; http://hdl.handle.net/10722/206758
University of Hong Kong
13.
Huang, Fei.
Design and analysis of transmission protocols in wireless
networks with smart antennas.
Degree: PhD, 2011, University of Hong Kong
URL: Huang,
F.
[黄菲].
(2011).
Design
and
analysis
of
transmission
protocols
in
wireless
networks
with
smart
antennas.
(Thesis).
University
of
Hong
Kong,
Pokfulam,
Hong
Kong
SAR.
Retrieved
from
http://dx.doi.org/10.5353/th_b4642161
;
http://dx.doi.org/10.5353/th_b4642161
;
http://hdl.handle.net/10722/144004
published_or_final_version
Electrical and Electronic
Engineering
Doctoral
Doctor of Philosophy
Advisors/Committee Members: Li, VOK, Yeung, LK.Subjects/Keywords: Wireless communication systems.; Adaptive antennas.
Record Details
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Share »
Record Details
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« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Huang, F. (2011). Design and analysis of transmission protocols in wireless
networks with smart antennas. (Doctoral Dissertation). University of Hong Kong. Retrieved from Huang, F. [黄菲]. (2011). Design and analysis of transmission protocols in wireless networks with smart antennas. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b4642161 ; http://dx.doi.org/10.5353/th_b4642161 ; http://hdl.handle.net/10722/144004
Chicago Manual of Style (16th Edition):
Huang, Fei. “Design and analysis of transmission protocols in wireless
networks with smart antennas.” 2011. Doctoral Dissertation, University of Hong Kong. Accessed June 18, 2019.
Huang, F. [黄菲]. (2011). Design and analysis of transmission protocols in wireless networks with smart antennas. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b4642161 ; http://dx.doi.org/10.5353/th_b4642161 ; http://hdl.handle.net/10722/144004.
MLA Handbook (7th Edition):
Huang, Fei. “Design and analysis of transmission protocols in wireless
networks with smart antennas.” 2011. Web. 18 Jun 2019.
Vancouver:
Huang F. Design and analysis of transmission protocols in wireless
networks with smart antennas. [Internet] [Doctoral dissertation]. University of Hong Kong; 2011. [cited 2019 Jun 18].
Available from: Huang, F. [黄菲]. (2011). Design and analysis of transmission protocols in wireless networks with smart antennas. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b4642161 ; http://dx.doi.org/10.5353/th_b4642161 ; http://hdl.handle.net/10722/144004.
Council of Science Editors:
Huang F. Design and analysis of transmission protocols in wireless
networks with smart antennas. [Doctoral Dissertation]. University of Hong Kong; 2011. Available from: Huang, F. [黄菲]. (2011). Design and analysis of transmission protocols in wireless networks with smart antennas. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b4642161 ; http://dx.doi.org/10.5353/th_b4642161 ; http://hdl.handle.net/10722/144004
University of Victoria
14.
Rahman, Md. Mizanur.
Modeling of compact antennas for wireless communication in complex environment.
Degree: Department of Electrical and Computer Engineering, 2018, University of Victoria
URL: https://dspace.library.uvic.ca//handle/1828/10064
► Demand for low-profile and compact antennas has greatly increased due to miniaturization of electronic devices. High performance for these antennas is also desired. The conflicting…
(more)
▼ Demand for low-profile and compact antennas has greatly increased due to miniaturization of electronic devices. High performance for these antennas is also desired. The conflicting nature of the requirements of high performance and compact size makes the design of these antennas challenging. The primary focus of this dissertation is to investigate and enhance the performance of various compact and low-profile antennas for
wireless communications.
Two dual band antennas for handheld telephones have been designed for the operation in AMPS and PCS bands and investigated in presence of the user's head. Antenna performance is evaluated in terms of VSWR, far-field radiation patterns, and the specific absorption rate (SAR) of energy in the user's head. A finite difference time domain (FDTD) code has been used for the modeling of antennas and user's head.
Two wide band circularly polarized patch antennas have also been analyzed using an FDTD code. A Moment Method based code (Ensemble) has been used to verify the performance of the antennas. Excitation of surface waves within the substrate of patch antennas is one of the main reasons for their low efficiency. Recently developed 2D planar photonic band gap (PBG) structures can be used to prevent the propagation of these unwanted surface waves within a particular frequency band. An analytical model has been developed for two existing PBG structures that predicts the band gaps for these structures. A new PBG structure with lower operating frequency and multiple stop bands has also been developed and modeled using the proposed analytical model. The analytical results have been compared with FDTD computed results and a good agreement has been found. Finally, a wide band circularly polarized patch has been further analyzed and integrated with a PBG structure. A significant improvement in the antenna performance is obtained with the use of PBG structure. The numerical results obtained are in excellent agreement with the measured data.
Advisors/Committee Members: Stuchly, M. A. (supervisor).
Subjects/Keywords: Antennas (Electronics); Wireless communication systems
Record Details
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Record Details
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Rahman, M. M. (2018). Modeling of compact antennas for wireless communication in complex environment. (Thesis). University of Victoria. Retrieved from https://dspace.library.uvic.ca//handle/1828/10064
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Rahman, Md Mizanur. “Modeling of compact antennas for wireless communication in complex environment.” 2018. Thesis, University of Victoria. Accessed June 18, 2019.
https://dspace.library.uvic.ca//handle/1828/10064.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Rahman, Md Mizanur. “Modeling of compact antennas for wireless communication in complex environment.” 2018. Web. 18 Jun 2019.
Vancouver:
Rahman MM. Modeling of compact antennas for wireless communication in complex environment. [Internet] [Thesis]. University of Victoria; 2018. [cited 2019 Jun 18].
Available from: https://dspace.library.uvic.ca//handle/1828/10064.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Rahman MM. Modeling of compact antennas for wireless communication in complex environment. [Thesis]. University of Victoria; 2018. Available from: https://dspace.library.uvic.ca//handle/1828/10064
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
15.
Ahmed, Hafiz.
Study on the trade off between throughput and power consumption in the design of bluetooth low energy applications.
Degree: 2013, University of Tennessee – Chattanooga
URL: https://scholar.utc.edu/theses/187
► Bluetooth Low Energy (BLE) is an emerging technology that is considered a breakthrough in the field of wireless communications due to its very low power…
(more)
▼ Bluetooth Low Energy (BLE) is an emerging technology that is considered a
breakthrough in the field of
wireless communications due to its very low power consumption property. One of the issues of the current practical implementations of BLE is throughput. The theoretical throughput of BLE is around 260 Kbps but the current practical implementations have much lower throughput values. In this work, the effect of important parameters related to the BLE connection and the
Generic Attribute Profile (GATT) protocol on the
throughput and power consumption of the system has been studied based on practical
laboratory experiments.
The throughput was found to increase almost linearly with the number of
characteristics and characteristic size used in a BLE application. Additionally, the throughput
was found to have an inverse relationship with the connection interval. The average current consumed while the device is connected was found to have a proportional relationship with the number of characteristics and characteristic size and therefore the battery life of a BLE
device is greatly affected by these variables.
Understanding these results is crucial to BLE system designers and developer because it allows them to design their
systems in a way that suits their needs optimally.
Advisors/Committee Members: Eltom, Ahmed H., Sartipi, Mina, Craven, Stephen, College of Engineering and Computer Science.
Subjects/Keywords: Bluetooth technology; Wireless communication systems
Record Details
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Record Details
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Ahmed, H. (2013). Study on the trade off between throughput and power consumption in the design of bluetooth low energy applications. (Masters Thesis). University of Tennessee – Chattanooga. Retrieved from https://scholar.utc.edu/theses/187
Chicago Manual of Style (16th Edition):
Ahmed, Hafiz. “Study on the trade off between throughput and power consumption in the design of bluetooth low energy applications.” 2013. Masters Thesis, University of Tennessee – Chattanooga. Accessed June 18, 2019.
https://scholar.utc.edu/theses/187.
MLA Handbook (7th Edition):
Ahmed, Hafiz. “Study on the trade off between throughput and power consumption in the design of bluetooth low energy applications.” 2013. Web. 18 Jun 2019.
Vancouver:
Ahmed H. Study on the trade off between throughput and power consumption in the design of bluetooth low energy applications. [Internet] [Masters thesis]. University of Tennessee – Chattanooga; 2013. [cited 2019 Jun 18].
Available from: https://scholar.utc.edu/theses/187.
Council of Science Editors:
Ahmed H. Study on the trade off between throughput and power consumption in the design of bluetooth low energy applications. [Masters Thesis]. University of Tennessee – Chattanooga; 2013. Available from: https://scholar.utc.edu/theses/187
Montana State University
16.
Weber, Raymond Joseph.
Development of a cognitive array system.
Degree: College of Engineering, 2010, Montana State University
URL: https://scholarworks.montana.edu/xmlui/handle/1/2516
► This thesis proposes a design for a cognitive array system for next generation wireless communication systems, combining the techniques of cognitive radios and adaptive array…
(more)
▼ This thesis proposes a design for a cognitive array system for next generation
wireless communication systems, combining the techniques of cognitive radios and adaptive array
systems. This novel array system allows for the possibility of greater spectral usage and reuse, and improved
communication ranges. In this thesis, numerous algorithms were studied to map an RF environment in both spatial and spectral domains that would be useful in this system. Towards this goal, direction of arrival estimation, frequency sensing and spectral hole finding algorithms were studied, in addition to a joint frequency and direction of arrival estimation algorithm. Beamforming was also studied as a means of improving signal quality and increasing range. Once the direction to a target was found, localization and tracking were studied to further refine the target's position and change in position over time. After the algorithms were studied in simulation to determine their properties, hardware calibration was performed followed by laboratory tests of the methods with a uniform circular array testbed at Montana State University to verify the expected performances.
Advisors/Committee Members: Chairperson, Graduate Committee: Richard Wolff. (advisor).
Subjects/Keywords: Wireless communication systems.; Antenna arrays.
Record Details
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Record Details
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Weber, R. J. (2010). Development of a cognitive array system. (Thesis). Montana State University. Retrieved from https://scholarworks.montana.edu/xmlui/handle/1/2516
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Weber, Raymond Joseph. “Development of a cognitive array system.” 2010. Thesis, Montana State University. Accessed June 18, 2019.
https://scholarworks.montana.edu/xmlui/handle/1/2516.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Weber, Raymond Joseph. “Development of a cognitive array system.” 2010. Web. 18 Jun 2019.
Vancouver:
Weber RJ. Development of a cognitive array system. [Internet] [Thesis]. Montana State University; 2010. [cited 2019 Jun 18].
Available from: https://scholarworks.montana.edu/xmlui/handle/1/2516.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Weber RJ. Development of a cognitive array system. [Thesis]. Montana State University; 2010. Available from: https://scholarworks.montana.edu/xmlui/handle/1/2516
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Victoria
17.
Annamalai, Annamalai Jr.
Accurate and efficient analysis of wireless digital communication systems in multiuser and multipath fading environments.
Degree: Department of Electrical and Computer Engineering, 2017, University of Victoria
URL: https://dspace.library.uvic.ca//handle/1828/8687
► Testimonies of “wireless catching up with wireline” have begun. However, the nonstationary and hostile nature of the wireless channel impose the greatest threat to reliable…
(more)
▼ Testimonies of “
wireless catching up with wireline” have begun. However, the nonstationary and hostile nature of the
wireless channel impose the greatest threat to reliable data transmission over
wireless links. The performance of a digital modulation scheme is degraded by many transmission impairments including fading, delay spread, co-channel interference and noise. Two powerful techniques for improving the quality of service over the
wireless network are investigated: diversity reception and adaptive error control schemes. Owing to the growing interest in
wireless communications, the importance of exact theoretical analysis of such
systems cannot be understated. In light of these considerations, this dissertation focuses on accurate and efficient analysis of
wireless digital
communication systems in multiuser and multipath fading environments.
The evaluation of error probabilities in digital
communication systems is often amenable to calculating a generic error probability of the form Pr {X ≤ 0}, where X is a random variable whose probability distribution is known. We advocate a simple numerical approach based on the Fourier or Laplace inversion formulas and Gauss-Chebychev quadratures (GCQ) for computing this error probability. Using this result, and by formulating the outage probability of cellular mobile radio networks in the framework of statistical decision theory, we can unify the outage performance analysis for cellular mobile radio
systems in generalized fading channels without imposing any restrictions on the desired signal and interferers statistics.
Next, we develop two unified analytical frameworks for evaluating the bit or symbol error probability (SER) of a broad class of coherent, differentially coherent and noncoherent digital
communication systems with diversity reception in generalized fading channels. The exact SER is mostly expressed in terms of a single finite-range integral, and in some cases in the form of double finite-range integrals. Virtually “exact” closed-form expressions (in terms of a rapidly converging series) are also derived. This offers a convenient method to perform a comprehensive study of all common diversity combining techniques (maximal-ratio combining (MRC), equal-gain combining (EGC), selection combining (SDC) and switched combining (SWC)) with different modulation formats in a myriad of fading scenarios. In particular, our unified approach based on characteristic function (CHF) method allows us to unify the above problem in a single common framework. Nevertheless, the moment generating function (MGF) method often yields a more concise solution than the CHF approach in the analysis of MRC, SDC and SWC diversity
systems.
Subsequently, we examine the performance of a maximum amplitude selection diversity (MA/SD) rake receiver configuration in indoor
wireless channels. The proposed low-complexity receiver structure is practically appealing because of its simplicity as well as its ability to operate effectively even at high signalling rates. We have also devised a…
Advisors/Committee Members: Bhargava, Vijay K. (supervisor).
Subjects/Keywords: Wireless communication systems; Digital communications
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APA (6th Edition):
Annamalai, A. J. (2017). Accurate and efficient analysis of wireless digital communication systems in multiuser and multipath fading environments. (Thesis). University of Victoria. Retrieved from https://dspace.library.uvic.ca//handle/1828/8687
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Annamalai, Annamalai Jr. “Accurate and efficient analysis of wireless digital communication systems in multiuser and multipath fading environments.” 2017. Thesis, University of Victoria. Accessed June 18, 2019.
https://dspace.library.uvic.ca//handle/1828/8687.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Annamalai, Annamalai Jr. “Accurate and efficient analysis of wireless digital communication systems in multiuser and multipath fading environments.” 2017. Web. 18 Jun 2019.
Vancouver:
Annamalai AJ. Accurate and efficient analysis of wireless digital communication systems in multiuser and multipath fading environments. [Internet] [Thesis]. University of Victoria; 2017. [cited 2019 Jun 18].
Available from: https://dspace.library.uvic.ca//handle/1828/8687.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Annamalai AJ. Accurate and efficient analysis of wireless digital communication systems in multiuser and multipath fading environments. [Thesis]. University of Victoria; 2017. Available from: https://dspace.library.uvic.ca//handle/1828/8687
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Victoria
18.
Wu, Bo.
On optimum system design for wireless communications.
Degree: Department of Electrical and Computer Engineering, 2018, University of Victoria
URL: https://dspace.library.uvic.ca//handle/1828/9747
► This dissertation addresses the issue of optimum system design to achieve reliable communication in the presence of various types of interference. Multiobjective formulation is used…
(more)
▼ This dissertation addresses the issue of optimum system design to achieve reliable
communication in the presence of various types of interference. Multiobjective
formulation is used with noncooperative and cooperative approaches owing to the
nature of the problems under consideration.
Since intentional Jamming is one of the most severe kinds of interference, anti-jam
techniques are crucial for communications in a hostile environment. The jam
and anti-jam problem is modeled as a two-person zero-sum game in which the communicator and the jammer have antagonistic objectives and are viewed as the two
players. The concept of Nash equilibrium is introduced and its characterizations
such as existence, uniqueness, stability, robustness, and sensitivity are investigated.
This model is then applied to a frequency-hop spread spectrum M-ary frequency-shift-keying system where ratio-threshold diversity is used to combat partial-band
noise and multitone jamming. Equilibrium performance in terms of cutoff rate and
bit error rate is shown to be superior to that predicted by worst-case analysis.
When mutual interference caused by simultaneous transmissions is the major
concern in a heterogeneous packet network, a multiobjective framework is proposed
in this dissertation with the objectives and constraints of the individual users taken
into consideration. Near-far effect and Rayleigh fading may occasion packet capture
and therefore create unfairness in favor of closer users. Thus, multiobjective
optimality is introduced, in which criterion of fairness is embedded. Optimum
strategies controlling transmission probability and/or power are examined to yield
the Pareto optimal solution in a slotted ALOHA network. Then, the same control
strategies are studied with the channel utilization being the maximization objective.
Optimization results are obtained in various situations, and effectiveness of
different strategies is compared.
A multimedia direct-sequence spread spectrum system may support multiple
services with different transmission rates and diverse quality-of-service requirements. To facilitate multimedia applications and maximize the system capacity,
average power control, error correction coding, and time diversity are incorporated
into the system. The capacity of such a system is evaluated in multipath Rayleigh
fading channels. Average bit error rate, outage probability, and corresponding information theoretic bounds are discussed. Concatenation of Reed-Solomon codes
and convolutional codes is considered for error correction to account for different
quality and delay constraints. It is shown through a numerical example that the
system capacity can be increased significantly by an appropriate system design.
Advisors/Committee Members: Wang, Qiang (supervisor).
Subjects/Keywords: Mathematical optimization; Wireless communication systems
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APA (6th Edition):
Wu, B. (2018). On optimum system design for wireless communications. (Thesis). University of Victoria. Retrieved from https://dspace.library.uvic.ca//handle/1828/9747
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Wu, Bo. “On optimum system design for wireless communications.” 2018. Thesis, University of Victoria. Accessed June 18, 2019.
https://dspace.library.uvic.ca//handle/1828/9747.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Wu, Bo. “On optimum system design for wireless communications.” 2018. Web. 18 Jun 2019.
Vancouver:
Wu B. On optimum system design for wireless communications. [Internet] [Thesis]. University of Victoria; 2018. [cited 2019 Jun 18].
Available from: https://dspace.library.uvic.ca//handle/1828/9747.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Wu B. On optimum system design for wireless communications. [Thesis]. University of Victoria; 2018. Available from: https://dspace.library.uvic.ca//handle/1828/9747
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Massey University
19.
Palmer, Stephen Matthew.
What is a cellphone? A tetradic odyssey : a study in media ecology.
Degree: M. Phil., Media Studies, 2011, Massey University
URL: http://hdl.handle.net/10179/2662
► This study asks the question, “What is a cellphone?” Marshall McLuhan et al. jointly devised the tetrad as a method for revealing the hidden characteristics…
(more)
▼ This study asks the question, “What is a cellphone?” Marshall McLuhan et al.
jointly devised the tetrad as a method for revealing the hidden characteristics
of any human medium or artefact. This study views a cellphone through the
tetrad’s distinctive four-dimensional non-dialectical approach. In the process,
many intriguing, surprising and even contradictory aspects come to light.
Subjects/Keywords: Media theory;
Wireless communication systems
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APA (6th Edition):
Palmer, S. M. (2011). What is a cellphone? A tetradic odyssey : a study in media ecology. (Masters Thesis). Massey University. Retrieved from http://hdl.handle.net/10179/2662
Chicago Manual of Style (16th Edition):
Palmer, Stephen Matthew. “What is a cellphone? A tetradic odyssey : a study in media ecology.” 2011. Masters Thesis, Massey University. Accessed June 18, 2019.
http://hdl.handle.net/10179/2662.
MLA Handbook (7th Edition):
Palmer, Stephen Matthew. “What is a cellphone? A tetradic odyssey : a study in media ecology.” 2011. Web. 18 Jun 2019.
Vancouver:
Palmer SM. What is a cellphone? A tetradic odyssey : a study in media ecology. [Internet] [Masters thesis]. Massey University; 2011. [cited 2019 Jun 18].
Available from: http://hdl.handle.net/10179/2662.
Council of Science Editors:
Palmer SM. What is a cellphone? A tetradic odyssey : a study in media ecology. [Masters Thesis]. Massey University; 2011. Available from: http://hdl.handle.net/10179/2662
Oregon State University
20.
Redfield, Stephen J.
Understanding the ultra-wideband channel within a computer chassis.
Degree: MS, Electrical and Computer Engineering, 2010, Oregon State University
URL: http://hdl.handle.net/1957/16473
► Recent developments in computing technology have generated a demand for more streamlined and effective test systems. By replacing traditional in-chassis wired interconnects with a broadcast…
(more)
▼ Recent developments in computing technology have generated a demand for more streamlined and effective test
systems. By replacing traditional in-chassis wired interconnects with a broadcast
wireless system, fault detection and error susceptibility will drastically improve, input/output capabilities will expand, and routing complexity will decrease. Ultra-wideband impulse radio's (UWB-IR) characteristic multipath-immunity and free-licensed spectrum makes it ideal for use in this scenario. Understanding the unique and complex communications channel within the confines of a computer is vital to any future system implementation. A comprehensive measurement campaign is mounted with the goal of thoroughly characterizing this channel. A UWB channel model specifying channel impulse response (CIR), path loss, and fading characteristics is derived and presented in enough detail to be used as a guide for future channel modeling endeavors. Analysis of this model provides a baseline for a proof-of-concept communications system consisting of a UWB pulser and receiver, which are implemented on printed circuit board (PCB) to decrease prototyping costs. These devices are then implemented within the channel of interest to find a UWB pulse response. The pulse response measurement is a simple experiment which takes into account the pulse distortion and delay spread shortening effects of UWB antennas and in-channel radiating interference, which are not apparent in the traditional channel model. The comprehensive model is then used to determine any issues that may arise during the conversion from wired to
wireless interconnects among a computer's integrated circuits (IC).
Advisors/Committee Members: Liu, Huaping (advisor), Liu, Huaping (committee member).
Subjects/Keywords: Ultra-wideband; Wireless communication systems
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APA (6th Edition):
Redfield, S. J. (2010). Understanding the ultra-wideband channel within a computer chassis. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/16473
Chicago Manual of Style (16th Edition):
Redfield, Stephen J. “Understanding the ultra-wideband channel within a computer chassis.” 2010. Masters Thesis, Oregon State University. Accessed June 18, 2019.
http://hdl.handle.net/1957/16473.
MLA Handbook (7th Edition):
Redfield, Stephen J. “Understanding the ultra-wideband channel within a computer chassis.” 2010. Web. 18 Jun 2019.
Vancouver:
Redfield SJ. Understanding the ultra-wideband channel within a computer chassis. [Internet] [Masters thesis]. Oregon State University; 2010. [cited 2019 Jun 18].
Available from: http://hdl.handle.net/1957/16473.
Council of Science Editors:
Redfield SJ. Understanding the ultra-wideband channel within a computer chassis. [Masters Thesis]. Oregon State University; 2010. Available from: http://hdl.handle.net/1957/16473
21.
Aldroubi, Marwan.
Collaborative modulation multiple access for single hop and multihop networks.
Degree: PhD, 2012, University of Sussex
URL: http://sro.sussex.ac.uk/id/eprint/39645/
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.556439
► While the bandwidth available for wireless networks is limited, the world has seen an unprecedented growth in the number of mobile subscribers and an ever…
(more)
▼ While the bandwidth available for wireless networks is limited, the world has seen an unprecedented growth in the number of mobile subscribers and an ever increasing demand for high data rates. Therefore efficient utilisation of bandwidth to maximise link spectral efficiency and number of users that can be served simultaneously are primary goals in the design of wireless systems. To achieve these goals, in this thesis, a new non-orthogonal uplink multiple access scheme which combines the functionalities of adaptive modulation and multiple access called collaborative modulation multiple access (CMMA) is proposed. CMMA enables multiple users to access the network simultaneously and share the same bandwidth even when only a single receive antenna is available and in the presence of high channel correlation. Instead of competing for resources, users in CMMA share resources collaboratively by employing unique modulation sets (UMS) that differ in phase, power, and/or mapping structure. These UMS are designed to insure that the received signal formed from the superposition of all users' signals belongs to a composite QAM constellation (CC) with a rate equal to the sum rate of all users. The CC and its constituent UMSs are designed centrally at the BS to remove ambiguity, maximize the minimum Euclidian distance (dmin) of the CC and insure a minimum BER performance is maintained. Users collaboratively precode their transmitted signal by performing truncated channel inversion and phase rotation using channel state information (CSI ) obtained from a periodic common pilot to insure that their combined signal at the BS belongs to the CC known at the BS which in turn performs a simple joint maximum likelihood detection without the need for CSI. The coherent addition of users' power enables CMMA to achieve high link spectral efficiency at any time without extra power or bandwidth but on the expense of graceful degradation in BER performance. To improve the BER performance of CMMA while preserving its precoding and detection structure and without the need for pilot-aided channel estimation, a new selective diversity combining scheme called SC-CMMA is proposed. SC-CMMA optimises the overall group performance providing fairness and diversity gain for various users with different transmit powers and channel conditions by selecting a single antenna out of a group of L available antennas that minimises the total transmit power required for precoding at any one time. A detailed study of capacity and BER performance of CMMA and SC-CMMA is carried out under different level of channel correlations which shows that both offer high capacity gain and resilience to channel correlation. SC-CMMA capacity even increase with high channel correlation between users' channels. CMMA provides a practical solution for implementing the multiple access adder channel (MAAC) in fading environments hence a hybrid approach combining both collaborative coding and modulation referred to as H-CMMA is investigated. H-CMMA divides users into a number of subgroups…
Subjects/Keywords: 620; TK5103.2 Wireless communication systems
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APA (6th Edition):
Aldroubi, M. (2012). Collaborative modulation multiple access for single hop and multihop networks. (Doctoral Dissertation). University of Sussex. Retrieved from http://sro.sussex.ac.uk/id/eprint/39645/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.556439
Chicago Manual of Style (16th Edition):
Aldroubi, Marwan. “Collaborative modulation multiple access for single hop and multihop networks.” 2012. Doctoral Dissertation, University of Sussex. Accessed June 18, 2019.
http://sro.sussex.ac.uk/id/eprint/39645/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.556439.
MLA Handbook (7th Edition):
Aldroubi, Marwan. “Collaborative modulation multiple access for single hop and multihop networks.” 2012. Web. 18 Jun 2019.
Vancouver:
Aldroubi M. Collaborative modulation multiple access for single hop and multihop networks. [Internet] [Doctoral dissertation]. University of Sussex; 2012. [cited 2019 Jun 18].
Available from: http://sro.sussex.ac.uk/id/eprint/39645/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.556439.
Council of Science Editors:
Aldroubi M. Collaborative modulation multiple access for single hop and multihop networks. [Doctoral Dissertation]. University of Sussex; 2012. Available from: http://sro.sussex.ac.uk/id/eprint/39645/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.556439
22.
Holroyd, Patrick Michael.
A framework for the design, prototyping and evaluation of mobile interfaces for domestic environments.
Degree: PhD, 2013, University of Sussex
URL: http://sro.sussex.ac.uk/id/eprint/45101/
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.574936
► The idea of the smart home has been discussed for over three decades, but it has yet to achieve mass-market adoption. This thesis asks the…
(more)
▼ The idea of the smart home has been discussed for over three decades, but it has yet to achieve mass-market adoption. This thesis asks the question Why is my home not smart? It highlights four main areas that are barriers to adoption, and concentrates on a single one of these issues: usability. It presents an investigation that focuses on design, prototyping and evaluation of mobile interfaces for domestic environments resulting in the development of a novel framework. A smart home is the physical realisation of a ubiquitous computing system for domestic living. The research area offers numerous benefits to end-users such as convenience, assistive living, energy saving and improved security and safety. However, these benefits have yet to become accessible due to a lack of usable smart home control interfaces. This issue is considered a key reason for lack of adoption and is the focus for this thesis. Within this thesis, a framework is introduced as a novel approach for the design, prototyping and evaluation of mobile interfaces for domestic environments. Included within this framework are three components. Firstly, the Reconfigurable Multimedia Environment (RME), a physical evaluation and observation space for conducting user centred research. Secondly, Simulated Interactive Devices (SID), a video-based development and control tool for simulating interactive devices commonly found within a smart home. Thirdly, iProto, a tool that facilitates the production and rapid deployment of high fidelity prototypes for mobile touch screen devices. This framework is evaluated as a round-tripping toolchain for prototyping smart home control and found to be an efficient process for facilitating the design and evaluation of such interfaces.
Subjects/Keywords: 004; TK5103.2 Wireless communication systems
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APA (6th Edition):
Holroyd, P. M. (2013). A framework for the design, prototyping and evaluation of mobile interfaces for domestic environments. (Doctoral Dissertation). University of Sussex. Retrieved from http://sro.sussex.ac.uk/id/eprint/45101/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.574936
Chicago Manual of Style (16th Edition):
Holroyd, Patrick Michael. “A framework for the design, prototyping and evaluation of mobile interfaces for domestic environments.” 2013. Doctoral Dissertation, University of Sussex. Accessed June 18, 2019.
http://sro.sussex.ac.uk/id/eprint/45101/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.574936.
MLA Handbook (7th Edition):
Holroyd, Patrick Michael. “A framework for the design, prototyping and evaluation of mobile interfaces for domestic environments.” 2013. Web. 18 Jun 2019.
Vancouver:
Holroyd PM. A framework for the design, prototyping and evaluation of mobile interfaces for domestic environments. [Internet] [Doctoral dissertation]. University of Sussex; 2013. [cited 2019 Jun 18].
Available from: http://sro.sussex.ac.uk/id/eprint/45101/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.574936.
Council of Science Editors:
Holroyd PM. A framework for the design, prototyping and evaluation of mobile interfaces for domestic environments. [Doctoral Dissertation]. University of Sussex; 2013. Available from: http://sro.sussex.ac.uk/id/eprint/45101/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.574936
23.
Bukar, Ibrahim.
Spectrally efficient Non-Orthogonal Multiple Access (NOMA) techniques for future generation mobile systems.
Degree: PhD, 2017, University of Sussex
URL: http://sro.sussex.ac.uk/id/eprint/71053/
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.731209
► With the expectation of over a 1000-fold increase in the number of connected devices by 2020, efficient utilization of the limited bandwidth has become ever…
(more)
▼ With the expectation of over a 1000-fold increase in the number of connected devices by 2020, efficient utilization of the limited bandwidth has become ever more important in the design of mobile wireless systems. Furthermore, the ever-increasing demand for higher data rates has made it necessary for a new waveform design that satisfies not only throughput demands, but network capacity as well. One such technique recently proposed is the non-orthogonal multiple access (NOMA) which utilizes the distance-dependent power domain multiplexing, based on the principles of signal superposition. In this thesis, new spectrally efficient non-orthogonal signal techniques are proposed. The goal of the schemes is to allow simultaneous utilization of the same time frequency network resources. This is achieved by designing component signals in both power and phase domain such that users are precoded or preformed to form a single and uniquely decodable composite signal. The design criteria are based on maximizing either the sum rate or spectral efficiency, minimizing multi-user interference and detection ambiguity, and maximizing the minimum Euclidean distance between the composite constellation points. The design principles are applied in uplink, downlink and coordinated multipoint (CoMP) scenarios. We assume ideal channel state with perfect estimation, low mobility and synchronization scenarios so as to prove the concept and serve as a bound for any future work in non-ideal conditions. Extensive simulations and numerical analysis are carried to show the superiority and compatibility of the schemes. First, a new NOMA signal design called uplink NOMA with constellation precoding is proposed. The precoding weights are generated at the eNB based on the number of users to be superposed. The eNB signals the precoding weights to be employed by the users to adjust their transmission. The adjustments utilize the channel state information estimated from common periodic pilots broadcasted by the eNB. The weights ensure the composite received signal at the eNB belongs to the pre-known constellation. Furthermore, the users precode to the eNB antenna that requires the least total transmit power from all the users. At the eNB, joint maximum likelihood (JML) detection is employed to recover the component signals. As the composite constellation is as that of a single user transmitting that same constellation, multiple access interference can be viewed as absent, which allows multiple users to transmit at their full rates. Furthermore, the power gain achieved by the sum of the component signals maximizes the sum rate. Secondly, the constellation design principle is employed in the downlink scenario. In the scheme, called downlink NOMA with constellation preforming, the eNB preforms the users signal with power and phase weights prior to transmission. The preforming ensures multi-user interference is eliminated and the spectral efficiency maximized. The preformed composite constellation is broadcasted by the eNB which is received by all users.…
Subjects/Keywords: 620; TK5103.2 Wireless communication systems
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APA (6th Edition):
Bukar, I. (2017). Spectrally efficient Non-Orthogonal Multiple Access (NOMA) techniques for future generation mobile systems. (Doctoral Dissertation). University of Sussex. Retrieved from http://sro.sussex.ac.uk/id/eprint/71053/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.731209
Chicago Manual of Style (16th Edition):
Bukar, Ibrahim. “Spectrally efficient Non-Orthogonal Multiple Access (NOMA) techniques for future generation mobile systems.” 2017. Doctoral Dissertation, University of Sussex. Accessed June 18, 2019.
http://sro.sussex.ac.uk/id/eprint/71053/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.731209.
MLA Handbook (7th Edition):
Bukar, Ibrahim. “Spectrally efficient Non-Orthogonal Multiple Access (NOMA) techniques for future generation mobile systems.” 2017. Web. 18 Jun 2019.
Vancouver:
Bukar I. Spectrally efficient Non-Orthogonal Multiple Access (NOMA) techniques for future generation mobile systems. [Internet] [Doctoral dissertation]. University of Sussex; 2017. [cited 2019 Jun 18].
Available from: http://sro.sussex.ac.uk/id/eprint/71053/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.731209.
Council of Science Editors:
Bukar I. Spectrally efficient Non-Orthogonal Multiple Access (NOMA) techniques for future generation mobile systems. [Doctoral Dissertation]. University of Sussex; 2017. Available from: http://sro.sussex.ac.uk/id/eprint/71053/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.731209
24.
Rajaei, Aydin.
Efficient and flexible geocasting for opportunistic networks.
Degree: PhD, 2016, University of Sussex
URL: http://sro.sussex.ac.uk/id/eprint/66039/
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.701629
► With the proliferation of smartphones and their advanced connectivity capabilities, opportunistic networks have gained a lot of traction during the past years; they are suitable…
(more)
▼ With the proliferation of smartphones and their advanced connectivity capabilities, opportunistic networks have gained a lot of traction during the past years; they are suitable for increasing network capacity and sharing ephemeral, localised content. They can also offload traffic from cellular networks to device-to-device ones, when cellular networks are heavily stressed. Opportunistic networks can play a crucial role in communication scenarios where the network infrastructure is inaccessible due to natural disasters, large scale terrorist attacks or government censorship. Geocasting, where messages are destined to specific locations (casts) instead of explicitly identified devices, has a large potential in real world opportunistic networks, however it has attracted little attention in the context of opportunistic networking. In this thesis, we propose Geocasting Spray And Flood (GSAF), a simple but efficient and flexible geocasting protocol for opportunistic, delay tolerant networks. GSAF follows a simple but elegant and flexible approach where messages take random walks towards the destination cast. Messages that follow directions away from the cast are extinct when the device buffer gets full, freeing space for new messages to be delivered. In GSAF, casts do not have to be pre-defined; instead users can route messages to arbitrarily defined casts. Also, the addressed cast is flexible in comparison to other approaches and can take complex shapes in the network. DA-GSAF as the direction aware version of the GSAF is proposed as well which use location information to aid routing decisions in the GSAF. Extensive evaluation shows that GSAF and DA-GSAF are significantly more efficient than existing solutions, in terms of message delivery ratio and latency as well as network overhead.
Subjects/Keywords: 621.382; TK5103.2 Wireless communication systems
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APA (6th Edition):
Rajaei, A. (2016). Efficient and flexible geocasting for opportunistic networks. (Doctoral Dissertation). University of Sussex. Retrieved from http://sro.sussex.ac.uk/id/eprint/66039/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.701629
Chicago Manual of Style (16th Edition):
Rajaei, Aydin. “Efficient and flexible geocasting for opportunistic networks.” 2016. Doctoral Dissertation, University of Sussex. Accessed June 18, 2019.
http://sro.sussex.ac.uk/id/eprint/66039/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.701629.
MLA Handbook (7th Edition):
Rajaei, Aydin. “Efficient and flexible geocasting for opportunistic networks.” 2016. Web. 18 Jun 2019.
Vancouver:
Rajaei A. Efficient and flexible geocasting for opportunistic networks. [Internet] [Doctoral dissertation]. University of Sussex; 2016. [cited 2019 Jun 18].
Available from: http://sro.sussex.ac.uk/id/eprint/66039/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.701629.
Council of Science Editors:
Rajaei A. Efficient and flexible geocasting for opportunistic networks. [Doctoral Dissertation]. University of Sussex; 2016. Available from: http://sro.sussex.ac.uk/id/eprint/66039/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.701629
25.
Lawal, Lasisi Salami.
Economically sustainable public security and emergency network exploiting a broadband communications satellite.
Degree: PhD, 2014, University of Sussex
URL: http://sro.sussex.ac.uk/id/eprint/50603/
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.629052
► The research contributes to work in Rapid Deployment of a National Public Security and Emergency Communications Network using Communication Satellite Broadband. Although studies in Public…
(more)
▼ The research contributes to work in Rapid Deployment of a National Public Security and Emergency Communications Network using Communication Satellite Broadband. Although studies in Public Security Communication networks have examined the use of communications satellite as an integral part of the Communication Infrastructure, there has not been an in-depth design analysis of an optimized regional broadband-based communication satellite in relation to the envisaged service coverage area, with little or no terrestrial last-mile telecommunications infrastructure for delivery of satellite solutions, applications and services. As such, the research provides a case study of a Nigerian Public Safety Security Communications Pilot project deployed in regions of the African continent with inadequate terrestrial last mile infrastructure and thus requiring a robust regional Communications Satellite complemented with variants of terrestrial wireless technologies to bridge the digital hiatus as a short and medium term measure apart from other strategic needs. The research not only addresses the pivotal role of a secured integrated communications Public safety network for security agencies and emergency service organizations with its potential to foster efficient information symmetry amongst their operations including during emergency and crisis management in a timely manner but demonstrates a working model of how analogue spectrum meant for Push-to-Talk (PTT) services can be re-farmed and digitalized as a “dedicated” broadband-based public communications system. The network's sustainability can be secured by using excess capacity for the strategic commercial telecommunication needs of the state and its citizens. Utilization of scarce spectrum has been deployed for Nigeria's Cashless policy pilot project for financial and digital inclusion. This effectively drives the universal access goals, without exclusivity, in a continent, which still remains the least wired in the world.
Subjects/Keywords: 620; TK5103.2 Wireless communication systems
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APA (6th Edition):
Lawal, L. S. (2014). Economically sustainable public security and emergency network exploiting a broadband communications satellite. (Doctoral Dissertation). University of Sussex. Retrieved from http://sro.sussex.ac.uk/id/eprint/50603/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.629052
Chicago Manual of Style (16th Edition):
Lawal, Lasisi Salami. “Economically sustainable public security and emergency network exploiting a broadband communications satellite.” 2014. Doctoral Dissertation, University of Sussex. Accessed June 18, 2019.
http://sro.sussex.ac.uk/id/eprint/50603/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.629052.
MLA Handbook (7th Edition):
Lawal, Lasisi Salami. “Economically sustainable public security and emergency network exploiting a broadband communications satellite.” 2014. Web. 18 Jun 2019.
Vancouver:
Lawal LS. Economically sustainable public security and emergency network exploiting a broadband communications satellite. [Internet] [Doctoral dissertation]. University of Sussex; 2014. [cited 2019 Jun 18].
Available from: http://sro.sussex.ac.uk/id/eprint/50603/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.629052.
Council of Science Editors:
Lawal LS. Economically sustainable public security and emergency network exploiting a broadband communications satellite. [Doctoral Dissertation]. University of Sussex; 2014. Available from: http://sro.sussex.ac.uk/id/eprint/50603/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.629052
26.
Hayes, T.
Routing protocols for next generation mobile wireless sensor networks.
Degree: PhD, 2016, University of Sussex
URL: http://sro.sussex.ac.uk/id/eprint/63977/
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.701608
► The recent research interest in wireless sensor networks has caused the development of many new applications and subsequently, these emerging applications have ever increasing requirements.…
(more)
▼ The recent research interest in wireless sensor networks has caused the development of many new applications and subsequently, these emerging applications have ever increasing requirements. One such requirement is that of mobility, which has inspired an entirely new array of applications in the form of mobile wireless sensor networks (MWSNs). In terms of communications, MWSNs present a challenging environment due to the high rate at which the topology may be changing. As such, the motivation of this work is to investigate potential communications solutions, in order to satisfy the performance demands of new and future MWSN applications. As such this work begins by characterising and evaluating the requirement of a large variety of these emerging applications. This thesis focuses on the area of routing, which is concerned with the reliable and timely delivery of data from multiple, mobile sensor nodes to a data sink. For this purpose the technique of gradient routing was identified as a suitable solution, since data can quickly be passed down a known gradient that is anchored at the sink. However, in a mobile network, keeping the gradient up-to-date is a key issue. This work proposes the novel use of a global time division multiple access (GTDMA) MAC as a solution to this problem, which mitigates the need for regularly flooding the network. Additionally, the concept of blind forwarding is utilised for its low overhead and high reliability through its inherent route diversity. The key contribution of this thesis is in three novel routing protocols, which use the aforementioned principles. The first protocol, PHASeR, uses a hop-count metric and encapsulates data from multiple nodes in its packets. The hop-count metric was chosen because it is simple and requires no additional hardware. The inclusion of encapsulation is intended to enable the protocol to cope with network congestion. The second protocol, LASeR, utilises location awareness to maintain a gradient and performs no encapsulation. Since many applications require location awareness, the communications systems may also take advantage of this readily available information and it can be used as a gradient metric. This protocol uses no encapsulation in order to reduce delay times. The third protocol, RASeR, uses the hop-count metric as a gradient and also does not perform encapsulation. The reduced delay time and the relaxed requirement for any existing method of location awareness makes this the most widely applicable of the three protocols. In addition to analytical expressions being derived, all three protocols are thoroughly tested through simulation. Results show the protocols to improve on the state-of-the-art and yield excellent performance over varying speeds, node numbers and data generation rates. LASeR shows the lowest overhead and delay, which comes from the advantage of having available location information. Alternatively, at the expense of increased overhead, RASeR gives comparatively high performance metrics without the need for location information.…
Subjects/Keywords: 620; TK5103.2 Wireless communication systems
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APA ·
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MLA ·
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Manager
APA (6th Edition):
Hayes, T. (2016). Routing protocols for next generation mobile wireless sensor networks. (Doctoral Dissertation). University of Sussex. Retrieved from http://sro.sussex.ac.uk/id/eprint/63977/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.701608
Chicago Manual of Style (16th Edition):
Hayes, T. “Routing protocols for next generation mobile wireless sensor networks.” 2016. Doctoral Dissertation, University of Sussex. Accessed June 18, 2019.
http://sro.sussex.ac.uk/id/eprint/63977/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.701608.
MLA Handbook (7th Edition):
Hayes, T. “Routing protocols for next generation mobile wireless sensor networks.” 2016. Web. 18 Jun 2019.
Vancouver:
Hayes T. Routing protocols for next generation mobile wireless sensor networks. [Internet] [Doctoral dissertation]. University of Sussex; 2016. [cited 2019 Jun 18].
Available from: http://sro.sussex.ac.uk/id/eprint/63977/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.701608.
Council of Science Editors:
Hayes T. Routing protocols for next generation mobile wireless sensor networks. [Doctoral Dissertation]. University of Sussex; 2016. Available from: http://sro.sussex.ac.uk/id/eprint/63977/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.701608
Stellenbosch University
27.
Kotze, Daniel Johannes Van Wyk.
Minimum congestion routing for a 17 GHz wireless ad hoc network.
Degree: Electrical and Electronic Engineering, 2011, Stellenbosch University
URL: http://hdl.handle.net/10019.1/6510
► Thesis (MScEng (Electrical and Electronic Engineering)) – University of Stellenbosch, 2011.
ENGLISH ABSTRACT: An investigation is made to find a suitable routing protocol for a millimeter…
(more)
▼ Thesis (MScEng (Electrical and Electronic Engineering)) – University of Stellenbosch, 2011.
ENGLISH ABSTRACT: An investigation is made to find a suitable routing protocol for a millimeter wave ad hoc
wireless network. It is discovered that a hierarchical routing protocol is ideal for a high
node density. Due to the high bandwidth that is possibly available, with millimeter wave
transmission, packets are used to keep links between nodes active and to control data packet
congestion. Cluster leaders are elected and use token packets to provide nodes with more
queued messages with more transmission chances, assisting the network in congestion control.
Hello messages are sent frequently to keep routing information at nodes fresh and to detect
broken links quickly. If a broken link is found a new route is readily available, within a
second. A simulation is created to test the protocol. Changes are made to the original
proactive cluster routing protocol to reduce the route length and lessen routing overhead.
A theoretical model is developed to estimate the mean waiting time for a packet. Although
insight is gained by modelling the latency with queueing theory it is suggested, due to the
protocol’s complexity, to use other mathematical modelling techniques such as a Markov
state model or a Petri net.
AFRIKAANSE OPSOMMING: Ondersoek word ingestel na ’n geskikte roete protokol vir ’n millimeter golflengte ad hoc radio
pakkie netwerk. Daar word gevind dat ’n hi¨erargiese kluster roete protokol ideaal is vir ’n
ho¨e digtheid van nodusse. As gevolg van die ho¨e bandwydte, wat moontlik beskikbaar is
met millimeter golflengte transmissie, word pakkies gebruik om kommunikasie skakels tussen
nodes in stand te hou en data pakkie verkeersopeenhoping te beheer. Kluster leiers word
verkies en gebruik teken-pakkies om nodes met ’n groter data pakkie las meer transmissie
kanse te gee. Sodoende word die verkeersopeenhoping van data pakkies verminder. Hallo
pakkies word gereeld gestuur om die roete inligting vars te hou en gebroke kommunikasie
skakels vinnig op te spoor. As ’n gebroke skakel gevind word, word ’n alternatiewe roete
vinnig opgestel, binne ’n sekonde. ’n Simulasie word opgestel om die protokol te toets.
Veranderinge aan die oorspronklike proaktiewe kluster protokol word aangebring om roete
lengte te verklein en oorhoofse roete inligting kommunikasie te verminder. ’n Teoretiese
model gebasseer op tou-staan teorie word ontwikkel om die wagtyd van ’n pakkie te bepaal.
Alhoewel, insig verkry is deur die protokol te analiseer deur middel van tou-staan teorie, word
daar voorgestel, as gevolg van die protokol se kompleksiteit, om eerder ander wiskundige
modelleeringstegnieke te gebruik soos ’n Markov toestands model of ’n Petri net.
Advisors/Committee Members: Wolhuter, R., University of Stellenbosch. Faculty of Engineering. Dept. of Electrical and Electronic Engineering..
Subjects/Keywords: Electronic engineering; Wireless communication systems
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Manager
APA (6th Edition):
Kotze, D. J. V. W. (2011). Minimum congestion routing for a 17 GHz wireless ad hoc network. (Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/6510
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Kotze, Daniel Johannes Van Wyk. “Minimum congestion routing for a 17 GHz wireless ad hoc network.” 2011. Thesis, Stellenbosch University. Accessed June 18, 2019.
http://hdl.handle.net/10019.1/6510.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kotze, Daniel Johannes Van Wyk. “Minimum congestion routing for a 17 GHz wireless ad hoc network.” 2011. Web. 18 Jun 2019.
Vancouver:
Kotze DJVW. Minimum congestion routing for a 17 GHz wireless ad hoc network. [Internet] [Thesis]. Stellenbosch University; 2011. [cited 2019 Jun 18].
Available from: http://hdl.handle.net/10019.1/6510.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kotze DJVW. Minimum congestion routing for a 17 GHz wireless ad hoc network. [Thesis]. Stellenbosch University; 2011. Available from: http://hdl.handle.net/10019.1/6510
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Rutgers University
28.
Tang, Xiaojun, 1978-.
Communicating over wireless channels with information-theoretic secrecy.
Degree: PhD, Electrical and Computer Engineering, 2010, Rutgers University
URL: http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000053342
► Wireless systems are susceptible to eavesdropping as an unwelcome result of the broadcast nature of the wireless medium. Fortunately, the wireless medium also provides endowments…
(more)
▼ Wireless systems are susceptible to eavesdropping as an unwelcome result of the broadcast nature of the
wireless medium. Fortunately, the
wireless medium also provides endowments including the temporal dispersion, the capability of signal superposition and other properties, to facilitate defending against eavesdropping. The focus of the thesis is to provide schemes for utilizing these properties at the physical layer and their performance analysis from an information-theoretic secrecy perspective. The work is based on Wyner's results on the wire-tap channel, in which the transmission between two legitimate users (Alice and Bob) is eavesdropped upon by Eve. The secrecy level is measured by the equivocation rate at Eve. The system performance is measured by the secrecy capacity. This is the maximum rate at which a message can be sent from Alice to Bob, while constraining the equivocation rate at Eve equal to the
communication rate, and thus ensuring that Eve cannot deduce any useful information asymptotically. First, the scenario where a secret message needs to be delivered to the intended receiver within a given delay constraint and without the knowledge of the channel state information (CSI) at the transmitter is considered. In particular, hybrid automatic retransmission request (HARQ) protocols are revisited for a block-fading wire-tap channel via a joint consideration of channel coding, secrecy coding, and retransmission protocols. Two secure HARQ protocols: a repetition time diversity (RTD) scheme with maximal-ratio combining, and an incremental redundancy (INR) scheme based on ratecompatible Wyner secrecy codes are analyzed via an outage-based formulation. The throughput of RTD and INR protocols under probabilistic outage requirements is derived. Asymptotic analysis and numerical computations are given to demonstrate both the benefits of HARQ protocols and the tradeoff between reliability and confidentiality in delay-constrained communications. Second, the effects of interference on information-theoretic secret
communication is considered. More specifically, the wiretap channel with a helping interferer (WT-HI) is proposed and studied. Here, an interferer, which does not know the confidential message, helps in ensuring the secrecy of the message by sending independent signals. Achievable secrecy rates and upper bounds on the secrecy capacity are given for both discrete memoryless and Gaussian channels. Interference has conventionally been regarded as a harmful phenomenon that leads to decreasing the rate and the reliability performance of
wireless systems. In this work, it is shown that interference can be exploited to assist
wireless secrecy. Lastly, the problem of secret key generation over fading channels, in which there exists an additional authenticated, public and error-free feedback channel from Bob to Alice, is considered. A key generation scheme consisting of a
communication phase and a key-generation phase is presented. The
communication phase is based on layered broadcast coding, which adapts…
Advisors/Committee Members: Tang, Xiaojun, 1978- (author), Spasojevic, Predrag (chair), Yates, Roy (internal member), Mandayam, Narayan (internal member), Poor, Vincent (outside member).
Subjects/Keywords: Wireless communication systems – Security measures
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APA (6th Edition):
Tang, Xiaojun, 1. (2010). Communicating over wireless channels with information-theoretic secrecy. (Doctoral Dissertation). Rutgers University. Retrieved from http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000053342
Chicago Manual of Style (16th Edition):
Tang, Xiaojun, 1978-. “Communicating over wireless channels with information-theoretic secrecy.” 2010. Doctoral Dissertation, Rutgers University. Accessed June 18, 2019.
http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000053342.
MLA Handbook (7th Edition):
Tang, Xiaojun, 1978-. “Communicating over wireless channels with information-theoretic secrecy.” 2010. Web. 18 Jun 2019.
Vancouver:
Tang, Xiaojun 1. Communicating over wireless channels with information-theoretic secrecy. [Internet] [Doctoral dissertation]. Rutgers University; 2010. [cited 2019 Jun 18].
Available from: http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000053342.
Council of Science Editors:
Tang, Xiaojun 1. Communicating over wireless channels with information-theoretic secrecy. [Doctoral Dissertation]. Rutgers University; 2010. Available from: http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000053342
Rutgers University
29.
Jadhav, Prashant, 1985-.
Fading correlation of co-located transmitters.
Degree: MS, Electrical and Computer Engineering, 2010, Rutgers University
URL: http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000056418
► Fading or attenuation of a signal due to environment is a phenomenon often encountered in wireless communications. It is expected that co-located transmitters i.e. transmitters…
(more)
▼ Fading or attenuation of a signal due to environment is a phenomenon often encountered in
wireless communications. It is expected that co-located transmitters i.e. transmitters placed very close to each other show a high signal fading correlation due to the presence of similar fading environment. In this thesis, we present an experimental study of this phenomenon. Correlation of received signal strengths obtained from co-located transmitters in dynamically varying environments indicate that the large scale signal variations (shadow fading) are highly correlated while the small scale variations (multipath or fast fading) show a low correlation. Highly correlated large scale variations suggest a presence of same large shadowing elements in the transmit-receive path while a low correlation among the multipath variations is due to mutual coupling between the antennas at very close distances. This has two implications: it suggests that shadow fading variations can serve as an indicator of the co-location of closely spaced transmitters while the multipath variations cannot. However, low multipath signal correlations suggest that antenna diversity could be investigated for implementation in mobile handsets.
Advisors/Committee Members: Jadhav, Prashant, 1985- (author), Zhang, Yanyong (chair), Yates, Roy (internal member), Trappe, Wade (internal member).
Subjects/Keywords: Wireless communication systems; Transmitting antennas
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APA ·
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Export
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APA (6th Edition):
Jadhav, Prashant, 1. (2010). Fading correlation of co-located transmitters. (Masters Thesis). Rutgers University. Retrieved from http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000056418
Chicago Manual of Style (16th Edition):
Jadhav, Prashant, 1985-. “Fading correlation of co-located transmitters.” 2010. Masters Thesis, Rutgers University. Accessed June 18, 2019.
http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000056418.
MLA Handbook (7th Edition):
Jadhav, Prashant, 1985-. “Fading correlation of co-located transmitters.” 2010. Web. 18 Jun 2019.
Vancouver:
Jadhav, Prashant 1. Fading correlation of co-located transmitters. [Internet] [Masters thesis]. Rutgers University; 2010. [cited 2019 Jun 18].
Available from: http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000056418.
Council of Science Editors:
Jadhav, Prashant 1. Fading correlation of co-located transmitters. [Masters Thesis]. Rutgers University; 2010. Available from: http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000056418
Rutgers University
30.
Loiacono, Michael T.
Cross-layer performance analysis and adaptation for real-time wireless video streaming.
Degree: PhD, Electrical and Computer Engineering, 2011, Rutgers University
URL: http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000057616
► The proliferation of wireless technology, mobile computing, and increasingly sophisticated video codecs have fueled the sharp increase in demand for user and machine-centric applications (such…
(more)
▼ The proliferation of wireless technology, mobile computing, and increasingly sophisticated video codecs have fueled the sharp increase in demand for user and machine-centric applications (such as IPTV, telemedicine, cyber-physical control, and surveillance) involving wireless video streaming. Unfortunately, today's state of the art local wireless technologies, such as IEEE 802.11, can be easily demonstrated to fail when subjected to the conditions associated with many of these real-world applications. This is because wireless video streaming involves complex relationships between the the video codec, the wireless PHY and MAC, and the application's (or user's) sensitivity to distortions in the video signal, and these relationships are not well understood or exploited by today's video streaming systems. In this dissertation, we reveal and analyze several key obstacles to wireless video streaming, and propose a set of adaptive real-time cross-layer approaches to deal with them. The dissertation begins with an overview of the major hurdles to wireless video streaming. A particular focus is on the instability of current link adaptation algorithms in CSMA/CA based wireless systems under the congested scenarios associated with wireless transmission of multiple simultaneous uplink video streams. Additionally, we focus on congestion control with respect to the fairness policies employed by the IEEE 802.11 channel access mechanism, and demonstrate that airtime fairness is preferred to throughput fairness for transmission of multiple simultaneous uplink video streams in a multi-rate environment. Several other obstacles are presented, including: the need for cross-layer approaches in wireless video streaming; problems with the use of MSE and PSNR in existing cross-layer approaches in today's literature; and the difficulty with perceptual, task-based video quality assessment in the context of an adaptive real-time cross-layer video streaming system. After that, we propose several adaptive real-time cross-layer solutions to deal with these obstacles. They include: (i) airtime fair distributed cross-layer congestion control in multi-rate wireless environments; (ii) cross-layer link adaptation for wireless-video; (iii) video quality assessment in adaptive real-time cross-layer video streaming systems; and (iv) joint link adaptation and congestion control driven by user/task-centric resource allocation. We support the proposed algorithms through simulations, theory, and experiments with real wireless devices on which we have implemented our algorithms.
Advisors/Committee Members: Loiacono, Michael T. (author), Trappe, Wade (chair), Gruteser, Marco (internal member), Raychaudhuri, Dipankar (internal member), Dana, Kristin (internal member), Rosca, Justinian (outside member).
Subjects/Keywords: Streaming video; Wireless communication systems
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APA ·
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APA (6th Edition):
Loiacono, M. T. (2011). Cross-layer performance analysis and adaptation for real-time wireless video streaming. (Doctoral Dissertation). Rutgers University. Retrieved from http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000057616
Chicago Manual of Style (16th Edition):
Loiacono, Michael T. “Cross-layer performance analysis and adaptation for real-time wireless video streaming.” 2011. Doctoral Dissertation, Rutgers University. Accessed June 18, 2019.
http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000057616.
MLA Handbook (7th Edition):
Loiacono, Michael T. “Cross-layer performance analysis and adaptation for real-time wireless video streaming.” 2011. Web. 18 Jun 2019.
Vancouver:
Loiacono MT. Cross-layer performance analysis and adaptation for real-time wireless video streaming. [Internet] [Doctoral dissertation]. Rutgers University; 2011. [cited 2019 Jun 18].
Available from: http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000057616.
Council of Science Editors:
Loiacono MT. Cross-layer performance analysis and adaptation for real-time wireless video streaming. [Doctoral Dissertation]. Rutgers University; 2011. Available from: http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000057616
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