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You searched for subject:(period modulation). Showing records 1 – 3 of 3 total matches.

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Delft University of Technology

1. He, Y. (author). Capacitive Sensor Interface Using an Inverter-Based Period Modulator.

Degree: 2014, Delft University of Technology

This thesis discusses the basic principles, circuit implementation and measurements of an inverter-based capacitive-sensor interface based on period modulation. The interface employs an inverter-based OTA and comparator to increase the current efficiency. Moreover, it applies new circuit techniques to reduce the die size and to reduce noise. A prototype interface has been implemented in a 0.16 ?m CMOS process to prove these concepts. The measurement results show that it can achieve more than 10 bit resolution consuming 14 ?A from a 1 V supply. The die size and energy efficiency have improved by more than an order-of-magnitude compared to previous interfaces based on period modulation.

MicroElectronics

Micro-electronics and Computer Engineering

Electrical Engineering, Mathematics and Computer Science

Advisors/Committee Members: Pertijs, M.A.P. (mentor).

Subjects/Keywords: capacitive sensor; period modulation; energy-efficiency; low-power

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

He, Y. (. (2014). Capacitive Sensor Interface Using an Inverter-Based Period Modulator. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:0780361f-6744-4836-9ad7-70a7df14307b

Chicago Manual of Style (16th Edition):

He, Y (author). “Capacitive Sensor Interface Using an Inverter-Based Period Modulator.” 2014. Masters Thesis, Delft University of Technology. Accessed October 31, 2020. http://resolver.tudelft.nl/uuid:0780361f-6744-4836-9ad7-70a7df14307b.

MLA Handbook (7th Edition):

He, Y (author). “Capacitive Sensor Interface Using an Inverter-Based Period Modulator.” 2014. Web. 31 Oct 2020.

Vancouver:

He Y(. Capacitive Sensor Interface Using an Inverter-Based Period Modulator. [Internet] [Masters thesis]. Delft University of Technology; 2014. [cited 2020 Oct 31]. Available from: http://resolver.tudelft.nl/uuid:0780361f-6744-4836-9ad7-70a7df14307b.

Council of Science Editors:

He Y(. Capacitive Sensor Interface Using an Inverter-Based Period Modulator. [Masters Thesis]. Delft University of Technology; 2014. Available from: http://resolver.tudelft.nl/uuid:0780361f-6744-4836-9ad7-70a7df14307b


Virginia Tech

2. Zuo, Ziwei. Fabrication of intensity-based Long-Period-Gratings fiber sensor with CO2 Laser.

Degree: MS, Electrical Engineering, 2015, Virginia Tech

This thesis investigates the fabrication technique and procedures for producing long period grating (LPG) fiber sensors with point-by-point irradiation under a CO2 laser beam. The type of fiber sensor under examination is desirable to be highly sensitive to the variation of the thickness and refractive index of a thin film deposited on the LPGs, making it a promising candidate as a core sensor component in a biosensor system developed for detection and verification of pathogenic bacteria, such as Methicillin-resistant Staphylococcus aureus (MRSA), Francisella tularensis, and so on. We have previously demonstrated that a UV-induced long-period-grating (LPG) based fiber sensor is extremely sensitive to small variation of refractive index (RI) and thickness of the surrounding medium. In this thesis, we will present a CO2 laser and step- stage system that operate automatically under control of a Matlab program to inscribe LPGs with desired grating period and fabrication conditions. Examples of CO2 laser induced LPGs have been found to exhibit high sensitivity, with transmissive power attenuation of more than 15 dB at the resonant peak of 1402 nm under deposition of Ionic Self-Assembled Monolayer (ISAM) thin film that is around 50 nm in thickness. When tuned to its maximum sensitivity region, this LPG has shown a transmission power reduction of 79% with the deposition of only 1 bilayer of ISAM thin film at the monitored wavelength. This result is comparable in sensitivity with the UV-induced LPGs, yet with the advantage of lower fabrication cost and simplified fabrication procedure. Advisors/Committee Members: Wang, Anbo (committeechair), Heflin, James Randy (committeechair), Poon, Ting Chung (committee member).

Subjects/Keywords: Long-period-gratings (LPGs); CO2 laser; fiber modulation; fiber sensing; ionic-self-assembling-multilayers (ISAMs) thin film

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Zuo, Z. (2015). Fabrication of intensity-based Long-Period-Gratings fiber sensor with CO2 Laser. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/54599

Chicago Manual of Style (16th Edition):

Zuo, Ziwei. “Fabrication of intensity-based Long-Period-Gratings fiber sensor with CO2 Laser.” 2015. Masters Thesis, Virginia Tech. Accessed October 31, 2020. http://hdl.handle.net/10919/54599.

MLA Handbook (7th Edition):

Zuo, Ziwei. “Fabrication of intensity-based Long-Period-Gratings fiber sensor with CO2 Laser.” 2015. Web. 31 Oct 2020.

Vancouver:

Zuo Z. Fabrication of intensity-based Long-Period-Gratings fiber sensor with CO2 Laser. [Internet] [Masters thesis]. Virginia Tech; 2015. [cited 2020 Oct 31]. Available from: http://hdl.handle.net/10919/54599.

Council of Science Editors:

Zuo Z. Fabrication of intensity-based Long-Period-Gratings fiber sensor with CO2 Laser. [Masters Thesis]. Virginia Tech; 2015. Available from: http://hdl.handle.net/10919/54599


Brigham Young University

3. Peel, Christian Bruce. Studies in Multiple-Antenna Wireless Communications.

Degree: PhD, 2004, Brigham Young University

Wireless communications systems are used today in a variety of milieux, with a recurring theme: users and applications regularly require higher throughput. Multiple antennas enable higher throughput and/or more robust performance than single-antenna communications, with no increase in power or frequency bandwidth. Systems are required which achieve the full potential of this "space-time" communication channel under the significant challenges of time-varying fading, multiple users, and the choice of appropriate coding schemes. This dissertation is focused on solutions to these problems. For the single-user case, there are many well-known coding techniques available; in the first part of this dissertation, the performance of two of these methods are analyzed. Trained and differential modulation are simple coding techniques for single-user time-varying channels. The performance of these coding methods is characterized for a channel having a constant specular component plus a time-varying diffuse component. A first- order auto-regressive model is used to characterize diffuse channel coefficients that vary from symbol to symbol, and is shown to lead to an effective SNR that decreases with time. A lower bound on the capacity of trained modulation is found for the specular/diffuse channel. This bound is maximized over the training length, training frequency, training signal, and training power. Trained modulation is shown to have higher capacity than differential coding, despite the effective SNR penalty of trained modulation versus differential methods. The second part of the dissertation considers the multi-user, multi-antenna channel, for which capacity-approaching codes were previously unavailable. Precoding with the channel inverse is shown to provide capacity that approaches a constant as the number of users and antennas simultaneously increase. To overcome this limitation, a simple encoding algorithm is introduced that operates close to capacity at sum-rates of tens of bits/channel-use. The algorithm is a variation on channel inversion that regularizes the inverse and uses a "sphere encoder" to perturb the data to reduce the energy of the transmitted signal. Simulation results are presented which support our analysis and algorithm development.

Subjects/Keywords: multiple-user wireless; sphere encoder; integer least-squares; differential modulation; training period; effective SNR; capacity lower bound; Electrical and Computer Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Peel, C. B. (2004). Studies in Multiple-Antenna Wireless Communications. (Doctoral Dissertation). Brigham Young University. Retrieved from https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=1118&context=etd

Chicago Manual of Style (16th Edition):

Peel, Christian Bruce. “Studies in Multiple-Antenna Wireless Communications.” 2004. Doctoral Dissertation, Brigham Young University. Accessed October 31, 2020. https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=1118&context=etd.

MLA Handbook (7th Edition):

Peel, Christian Bruce. “Studies in Multiple-Antenna Wireless Communications.” 2004. Web. 31 Oct 2020.

Vancouver:

Peel CB. Studies in Multiple-Antenna Wireless Communications. [Internet] [Doctoral dissertation]. Brigham Young University; 2004. [cited 2020 Oct 31]. Available from: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=1118&context=etd.

Council of Science Editors:

Peel CB. Studies in Multiple-Antenna Wireless Communications. [Doctoral Dissertation]. Brigham Young University; 2004. Available from: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=1118&context=etd

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