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University of Oulu

1. Lehtomäki, J. (Janne). Analysis of energy based signal detection.

Degree: 2005, University of Oulu

Abstract The focus of this thesis is on the binary signal detection problem, i.e., if a signal or signals are present or not. Depending on the application, the signal to be detected can be either unknown or known. The detection is based on some function of the received samples which is compared to a threshold. If the threshold is exceeded, it is decided that signal(s) is (are) present. Energy detectors (radiometers) are often used due to their simplicity and good performance. The main goal here is to develop and analyze energy based detectors as well as power-law based detectors. Different possibilities for setting the detection threshold for a quantized total power radiometer are analyzed. The main emphasis is on methods that use reference samples. In particular, the cell-averaging (CA) constant false alarm rate (CFAR) threshold setting method is analyzed. Numerical examples show that the CA strategy offers the desired false alarm probability, whereas a more conventional strategy gives too high values, especially with a small number of reference samples. New performance analysis of a frequency sweeping channelized radiometer is presented. The total power radiometer outputs from different frequencies are combined using logical-OR, sum and maximum operations. An efficient method is presented for accurately calculating the likelihood ratio used in the optimal detection. Also the effects of fading are analyzed. Numerical results show that although sweeping increases probability of intercept (POI), the final probability of detection is not increased if the number of observed hops is large. The performance of a channelized radiometer is studied when different CFAR strategies are used to set the detection threshold. The proposed iterative methods for setting the detection threshold are the forward consecutive mean excision (FCME) method with the CA scaling factors in final detection decision (FCME+CA), the backward consecutive mean excision (BCME) method with the CA scaling factors in detection (BCME+CA) and a method that uses the CA scaling factors for both censoring and detection (CA+CA). Numerical results show that iterative CFAR methods may improve detection performance compared to baseline methods. Finally, a method to set the threshold of a power-law detector that uses a nonorthogonal transform is presented. The mean, variance and skewness of the decision variable in the noise-only case are derived and these are used to find a shifted log-normal approximation for the distribution of the decision variable. The accuracy of this method is verified through simulations.

Subjects/Keywords: channelized radiometers; intercept receivers; power-law detectors; radiometers; signal detection; threshold settings

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APA (6th Edition):

Lehtomäki, J. (. (2005). Analysis of energy based signal detection. (Doctoral Dissertation). University of Oulu. Retrieved from http://urn.fi/urn:isbn:9514279255

Chicago Manual of Style (16th Edition):

Lehtomäki, J (Janne). “Analysis of energy based signal detection.” 2005. Doctoral Dissertation, University of Oulu. Accessed May 06, 2021. http://urn.fi/urn:isbn:9514279255.

MLA Handbook (7th Edition):

Lehtomäki, J (Janne). “Analysis of energy based signal detection.” 2005. Web. 06 May 2021.

Vancouver:

Lehtomäki J(. Analysis of energy based signal detection. [Internet] [Doctoral dissertation]. University of Oulu; 2005. [cited 2021 May 06]. Available from: http://urn.fi/urn:isbn:9514279255.

Council of Science Editors:

Lehtomäki J(. Analysis of energy based signal detection. [Doctoral Dissertation]. University of Oulu; 2005. Available from: http://urn.fi/urn:isbn:9514279255

2. De Jong, D. (author). The Effect of Network Structure and Signal Settings on the Macroscopic Fundamental Diagram.

Degree: 2012, Delft University of Technology

Recently it has been proposed that the performance of a complete network can be represented graphically using only aggregated data for flow and density. The resulting graph is the macroscopic fundamental diagram (MFD), which relates the average flow (performance) to the number of vehicles in the network (accumulation). The resulting shape is often concave, meaning that the performance can be maximised if a fixed number of vehicles is maintained in the network (optimal accumulation). One of the most promising methods to achieve this, is by adapting signal timings. The objective of this thesis is to investigate if (1) a relationship between the shape of the MFD and the structure of the underlying network exists and on which factors this depends and (2) if the shape of the MFD of a subnetwork (neighbourhood) and its perimeter (ring of higher level roads (with signalised intersections) around a subnetwork) are affected by different signal timings and how this does affect the applicability of the MFD for control strategies. To assess the effect of the structure on the network, a tool has been developed to automatically generate fictitious networks with different structures, in which the amount of infrastructure and signal timings are matched dynamically to a randomly generated OD-matrix. The resulting networks are used as a base for the simulations, which are done in the microscopic traffic simulator VISSIM. Using various signal timings for signals located on the perimeter, the flow from the subnetwork to the perimeter is restricted and vice-versa, in order to assess how the MFD of both react to these changes. Regarding the relation between the shape of the MFD and the network structure, it is concluded that the structure of a network in itself does not have a strong influence on the shape of the MFD. Differences between MFDs are not caused by topological differences, but by the different characteristics of the roads (length, speed, capacity) and the amount and type of intersections in the underlying network. The different factors influencing the shape of the MFD could not be quantified – in order to construct MFDs based only on knowledge of the network and without the use of simulations - as the shape of the MFD is found to differ strongly, even for similar networks. As such it is concluded that the stochastic and dynamic nature of traffic has a strong influence on the shape of the MFD. Especially the accumulation is highly sensitive to differences in the distribution of traffic over the network, making the optimal accumulation particularly hard to predict. Regarding the effect of signal settings on the shape of the MFD of a subnetwork and its perimeter and its applicability for control strategies, it is concluded that a strong relation between the MFD of the subnetwork and its perimeter does exist, in which both react in the same way to changes in traffic demand and signal timings. The ratio between the performance of the subnetwork and perimeter is highly consistent and not strongly affected by changes in the signal… Advisors/Committee Members: Hoogendoorn, S.P. (mentor), Knoop, V.L. (mentor), Van Lint, J.W.C. (mentor), Taale, H. (mentor), Wiggenraad, P.B.L. (mentor), Schreuder, M. (mentor), Reijneveld, A. (mentor).

Subjects/Keywords: MFD; Macroscopic Fundamental Diagram; signal settings; network structure

…135 Effect of signal settings on the macroscopic fundamental diagram… …150 8.5 The effect of signal settings on the accumulation… …maximum allowed speed, signal settings and average following distance. This then implies that… …highly dependent on each other, in which the signal settings affect the shape of both the MFDs… …the signal settings is not known. As the MFDs change, it should be expected that the optimal… 

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

APA (6th Edition):

De Jong, D. (. (2012). The Effect of Network Structure and Signal Settings on the Macroscopic Fundamental Diagram. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:476aa816-4fe8-4b61-adf7-a8d25ade944b

Chicago Manual of Style (16th Edition):

De Jong, D (author). “The Effect of Network Structure and Signal Settings on the Macroscopic Fundamental Diagram.” 2012. Masters Thesis, Delft University of Technology. Accessed May 06, 2021. http://resolver.tudelft.nl/uuid:476aa816-4fe8-4b61-adf7-a8d25ade944b.

MLA Handbook (7th Edition):

De Jong, D (author). “The Effect of Network Structure and Signal Settings on the Macroscopic Fundamental Diagram.” 2012. Web. 06 May 2021.

Vancouver:

De Jong D(. The Effect of Network Structure and Signal Settings on the Macroscopic Fundamental Diagram. [Internet] [Masters thesis]. Delft University of Technology; 2012. [cited 2021 May 06]. Available from: http://resolver.tudelft.nl/uuid:476aa816-4fe8-4b61-adf7-a8d25ade944b.

Council of Science Editors:

De Jong D(. The Effect of Network Structure and Signal Settings on the Macroscopic Fundamental Diagram. [Masters Thesis]. Delft University of Technology; 2012. Available from: http://resolver.tudelft.nl/uuid:476aa816-4fe8-4b61-adf7-a8d25ade944b


University of North Texas

3. Bober, Nicholas Bradburn. This Creature, Bride of Christ.

Degree: 2010, University of North Texas

This Creature, Bride of Christ is a composition for soprano, alto flute, viola, marimba, and computer running custom software for live interactive performance in the Max/MSP environment. The work is a setting of excerpts from The Book of Margery Kempe, an early autobiographical manuscript depicting the life of a Christian mystic. The thesis discusses the historical, sociological, and musical context of the text and its musical setting; the use of borrowed materials from music of John Dunstable, Richard Wagner, and the tradition of change ringing; and the technologies used to realize the computer accompaniment. A score of the work is also included in the appendix. Advisors/Committee Members: May, Andrew, 1968-, Klein, Joseph, 1962-, Nelson, Jon Christopher.

Subjects/Keywords: Margery Kempe; digital signal processing; Wagner; Parsifal; computer music; Songs (High voice) with instrumental ensemble  – Scores.; Electronic music.; Kempe, Margery, b. ca. 1373  – Musical settings.

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

APA (6th Edition):

Bober, N. B. (2010). This Creature, Bride of Christ. (Thesis). University of North Texas. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc28395/

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):

Bober, Nicholas Bradburn. “This Creature, Bride of Christ.” 2010. Thesis, University of North Texas. Accessed May 06, 2021. https://digital.library.unt.edu/ark:/67531/metadc28395/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Bober, Nicholas Bradburn. “This Creature, Bride of Christ.” 2010. Web. 06 May 2021.

Vancouver:

Bober NB. This Creature, Bride of Christ. [Internet] [Thesis]. University of North Texas; 2010. [cited 2021 May 06]. Available from: https://digital.library.unt.edu/ark:/67531/metadc28395/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Bober NB. This Creature, Bride of Christ. [Thesis]. University of North Texas; 2010. Available from: https://digital.library.unt.edu/ark:/67531/metadc28395/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.