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Thèses sur le sujet « Electronics and Communication »

Auteur : Grafiati

Publié le 7 juin 2025

Mis à jour le 2 août 2025

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1

Ham, Donhee Hajimiri Ali. "Statistical electronics : noise processes in integrated communication systems /." Diss., Pasadena, Calif. : California Institute of Technology, 2002. http://resolver.caltech.edu/CaltechETD:etd-03162005-141416.

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2

Schutter, Christopher Wayne. "Silent Communication Device." DigitalCommons@CalPoly, 2017. https://digitalcommons.calpoly.edu/theses/1712.

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Oral communication has constituted as a necessary aspect of how people interact with one another, but there are always situations where this form of communication can create distractions, irritation, or even danger. Take for example, a student in a laboratory who needs to communicate effectively with a lab partner without creating a distraction to those trying to work around said student or a soldier on a battlefield who needs to relay information effectively to his or her comrades without revealing his or her position to the enemy. It becomes apparent that people need a more exclusive form of

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3

Liang, Wei. "Cooperative communication for cognitive radio networks." Thesis, University of Southampton, 2015. https://eprints.soton.ac.uk/382935/.

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A Cooperative Cognitive Radio (CCR) network, which integrates a conventional cooperative system and cognitive radios (CRs) into a holistic system, is a promising paradigm for the next generation mobile communication systems. The spectral efficiency, power efficiency, bandwidth reduction and system complexity in CCR networks are the fundamental parameters of our system design and optimization. In this thesis, we focus our attention on opportunistically exploiting the underutilized spectrum band in the CR network with the aid of cooperative protocols. Furthermore, we invoke channel coding scheme

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4

Lee, Kah Ping. "Turbo equalization in wireless communication." Diss., Columbia, Mo. : University of Missouri-Columbia, 2005. http://hdl.handle.net/10355/5844.

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Thesis (M.S.)--University of Missouri-Columbia, 2005.<br>The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (July 11, 2006) Includes bibliographical references.

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5

Pakravan, Mohammad Reza. "Indoor infrared wireless communication channels." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0016/NQ57061.pdf.

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6

Howe, Daniel S. "Electronics and Communication Technology for a Surface Stimulation Device." Case Western Reserve University School of Graduate Studies / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=case1222456488.

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7

Wibowo, Henry 1966. "Communication software for telescience." Thesis, The University of Arizona, 1990. http://hdl.handle.net/10150/278227.

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This thesis presents a software development which enhances the applicability of the Operations and Science Instrument System (OASIS) software for teleoperation of scientific experiments or process plants at remote location. Software developed includes a TCP/IP communication interface for OASIS in the MicroVMS and SUN/Unix environments, and modification of previously developed software for a local controlling computer (LCC). Major improvements in software design implementation are done on the command processor task. A new software module is written for the communication part to accommodate the

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8

Douglas, Mark Gordon. "Antennas for personal communication systems." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0005/NQ34257.pdf.

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9

Denic, Stojan. "Communication subject to normed channel uncertainties." Thesis, University of Ottawa (Canada), 2006. http://hdl.handle.net/10393/29288.

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The transmission of information over a communication channel vastly depends on the level of knowledge that a transmitter and a receiver have about the channel and the interference. The transmission of information subject to insufficient knowledge of communication environment is called communication subject to uncertainties. The goal of this thesis is twofold: (1) To introduce new models for uncertain communication channels; (2) To define, compute, and analyze the performance of communication systems subject to introduced uncertainties from an information theoretic point of view. Various commun

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10

Xu, Aoxiang 1969. "A high performance audiovisual communication system /." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=33352.

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The development of a communications infrastructure for the Shared Reality Environment, a high-end immersive, telepresence space, is described. Such a system must support low-latency, high fidelity, bi-directional audio and video transfer between a number of locations interconnected by an IP network.<br>As a first attempt, MJPEG video, accompanied by monaural audio was transmitted between two laboratory spaces in the McGill Centre for Intelligent Machines. The relatively high latency resulting from JPEG compression and decompression motivated a hybrid approach in which raw data was selectively

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11

Cryan, R. A. "Communication systems." Thesis, University of Huddersfield, 1999. http://eprints.hud.ac.uk/id/eprint/7477/.

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12

Eriksson, Jens, and Kristian Nilsson. "Implementation of a Serial Communication Interface for a Signal Processor." Thesis, Linköping University, Department of Electrical Engineering, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2029.

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<p>The purpose of this thesis was to implement a serial communication port model for a digital signal processor. It is a behavioral model, developed using VHDL, that is instruction comparisable to the Motorola digital signal processor DSP 56002. It supports five different data transfer modes and provides a programmable baud rate generator. </p><p>This report starts out by giving a description of the external port, port C, the pin control logic and general purpose functionality. Then a more detailed description of the three pin dedicated serial communication interface is presented, the differen

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13

Du, Hao. "Optical wireless MIMO communication." Thesis, University of Warwick, 2015. http://wrap.warwick.ac.uk/70945/.

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This thesis provides an in-depth investigation and evaluation of infrared optical wireless MIMO communication systems to be applied in both indoor and outdoor environment. The principle objective of the research is to demonstrate both the advantages and disadvantages of the optical wireless MIMO systems using different modulation types. The first part provided analyses of important OW configurations using APD receivers using WMC model and SISO, MISO, SIMO and MIMO configuration. Thus, an analytical expression for 2-1 MISO, 1-2 SIMO and MIMO was successfully developed. This part also illustrate

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14

Tsianos, Konstantinos. "The role of the network in distributed optimization algorithms: convergence rates, scalability, communication/ computation tradeoffs and communication delays." Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=119626.

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Many questions of interest in various fields ranging from machine learning to computational biology and finance require the solution of an optimization problem. Frequently such problems are classified as large scale in the sense that they involve complex computations over very large datasets. The increasing interest in distributed optimization algorithms is motivated by two main reasons. First, the problem complexity pushes today's processors to their limits and the need for distributed algorithms arises quite naturally. A second and more practical reason is that sometimes the data is collecte

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15

Duran, Hamit. "Integrated high-speed electronics for transmitters in optical communication systems /." [S.l.] : [s.n.], 1995. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=10971.

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16

Yarkoni, Orr. "Engineering an inducible NO pathway to facilitate cell-electronics communication." Thesis, University of Newcastle Upon Tyne, 2012. http://hdl.handle.net/10443/1739.

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Turning cells into useful devices to perform unnatural functions creates the potential to permit the interface between biological organisms and electronics. In this thesis cell-based devices were designed and constructed to respond to either light or a specific chemical stimulus. Design constraints were defined by the eventual application of the device, a biohybrid robot. The enzyme endothelial nitric oxide synthase (eNOS) was chosen as a target for genetic engineering. Prior to constructing the device a suitable host for the engineered construct was selected. CHO-K1 cells were transfected wit

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17

Abid, Abubakar. "Ingestible electronics without batteries : power and communication for gastroresident devices." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/107102.

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Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2016.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 77-80).<br>In this thesis, I introduce a novel ingestible electronic device designed to reside inside the stomach for weeks or longer with both wireless communication and wireless powering capabilities. The device is powered by a transmitter outside of the body via wireless power transfer through 5 to 6 cm of tissue, while keeping under specific absorption of radiation limits. Electromagne

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18

Goulet, Laurent. "Turbo decoding for transmit diversity communication systems." Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=33969.

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This thesis considers a combination of iterative decoding with space-time coding, known as space-time-turbo coding. Parallel and serial concatenated codes are considered for transmission using different bandwidth allocation schemes.<br>The analysis of space-time-turbo codes is then performed in this thesis, resulting in the derivation of code design rules and of performance bounds. In particular, epsilon-capacity curves (based on the outage probability) are seen to provide a visually attractive method for the evaluation of the bandwidth-efficiency/performance tradeoff achieved by different cod

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19

Radji, Djelili. "Asymptotic optimal detection for MIMO communication systems." Thesis, McGill University, 2014. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=121110.

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The high complexity of optimal detection for spatial multiplexing MIMO systems motivates the need for more practical alternatives. Among many suboptimal schemes reported in the literature, very few can be proven to provide close to optimal performance with low fixed complexity. In this thesis, we consider a class of list-based detectors that first generate a list of candidate decision vectors, and then the best candidate in the list is chosen as the final decision. First, we perform a diversity analysis of such schemes and derive sufficient conditions for achieving optimal performance asymptot

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20

Fan, Ho Yin. "MIMO detection schemes for wireless communication /." View Abstract or Full-Text, 2002. http://library.ust.hk/cgi/db/thesis.pl?ELEC%202002%20FAN.

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Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2002.<br>Includes bibliographical references (leaves 64-66). Also available in electronic version. Access restricted to campus users.

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21

Pathak, Shrey. "Piezoelectric microsensors for semiochemical communication." Thesis, University of Warwick, 2012. http://wrap.warwick.ac.uk/57210/.

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Chemical communication plays vital role in the mediating the behaviour of an organism living in the “odour space”. The mechanisms by which odours are generated and detected by the organism has evolved over thousands of years and thus the potential advantages of translating this system into a fully functional communication system has opened new avenues in the area of multi-disciplinary research. This formed the basis of the Biosynthetic Infochemical Communications project – iCHEM whose central aim was to develop a new class of communication technology based on the biosynthesis pathways of the m

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22

Shi, Zhaogong. "Connection admission control methods for multimedia communication systems." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/mq22016.pdf.

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23

Florén, Johan, and Daniel Lindberg. "Bluetooth Communication For Remote Controlling Purpose." Thesis, Linköping University, Department of Electrical Engineering, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2379.

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<p>The concept of remote controlling electrical devices is not new; people of today are used to being able to control their household electronic items without making an effort to walk up to the device. </p><p>In this thesis the aim is to use Bluetooth radio signals instead of the traditional infrared light to achieve the remote control functions. As a test application a Sony Compact Disc player is modified in order to be radio controlled with a standard Ericsson T39 mobile phone used as a remote. Since the test application is rather simple without any special requirements the development of a

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24

Justice, Barry D. "A scheduling model for the U.S. Marine Corps Communication-Electronics School." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from the National Technical Information Service, 1993. http://handle.dtic.mil/100.2/ADA274958.

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Thesis (M.S. in Operations Research) Naval Postgraduate School, September 1993.<br>Thesis advisor(s): Brown, Gerald Gerard ; Wood, R. Kevin. "September 1993." Includes bibliographical references. Also available online.

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25

Corbeil, Sacha Emmanuel. "Polarization mode dispersion in cascaded optical fibre communication links." Thesis, University of Ottawa (Canada), 1998. http://hdl.handle.net/10393/4425.

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In this thesis, the theoretical models describing the physical origins of differential group delay (DGD) are presented, and methods of measuring the DGD process are discussed. Three measurement methods are evaluated for their practical usefulness (Jones matrix eigen-analysis, wave-length-scanning and interferometric techniques). Characterization based on measurements of the mean and correlation coefficients of the DGD process with respect to time, wave-length/frequency and temperature are made using the Jones matrix eigen-analysis method. A comparison between the measurements and numerical sim

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26

Bondy, Michel D. "Voice stream-based lip animation for audio-video communication." Thesis, University of Ottawa (Canada), 2001. http://hdl.handle.net/10393/9169.

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This thesis describes a system that uses the voice track to determine the shape of a speaker's lips for use in a model-based audio-video communication system. A parametric model (deformable template) is used to measure the shape of a speaker's lips. The system uses Linear Predictive Coding (LPC) analysis and the LPC cepstral coefficients for audio recognition. As each individual has his/her own typical lip positions while uttering various speech sounds the system is speaker dependent. A vector quantization algorithm is used to create a compact and speaker dependent cepstral coefficient to lip

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27

Karabulut, Gunes. "Matching pursuit algorithms with applications in wireless communication systems." Thesis, University of Ottawa (Canada), 2006. http://hdl.handle.net/10393/29354.

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Signal decomposition finds its applications in a wide range of areas. The problem of basis selection for signal decomposition consists of determining a small, possibly smallest, subset of vectors chosen from a large redundant set of vectors to match the given data. However, it is shown that finding the sparsest solution to linear systems is a nondeterministic polynomial time (NP) hard problem and requires combinatorial search. For a simpler solution, greedy heuristic algorithms, namely matching pursuit (MP) algorithms are proposed. These algorithms require sequential selection of basis vectors

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28

Martin, Frederic 1979. "Distributed detection for handoff macrodiversity in cellular communication systems." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=82617.

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This thesis considers the application of the principles of distributed signal detection to the uplink of a mobile communication unit engaged in soft handoff, when all base stations involved are equipped with multiple receiving antennas. The system consists of a local detector at each base station and a fusion center at the Mobile Switching Center (MSC). Optimum decision rules are derived for systems without channel coding, as well as for systems using channel coding, over a quasi-static spatially uncorrelated Rayleigh fading channel. Two different cases are considered. In the first case

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29

Leong, Sang-Yick. "Channel modeling, estimation and equalization in wireless communication." Diss., Columbia, Mo. : University of Missouri-Columbia, 2005. http://hdl.handle.net/10355/4183.

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Thesis (Ph. D.)--University of Missouri-Columbia, 2005.<br>The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (May 25, 2006) Vita. Includes bibliographical references.

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Goyal, Anupam. "Mobility management in global wireless communication networks." Diss., The University of Arizona, 1999. http://hdl.handle.net/10150/284056.

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Several issues have become important due to recent developments in communication devices and services, especially with increase in wireless and wireline devices and networking options. These are, congestion in area codes, number portability, need to support intelligent networking, wireless-wireline integration, and demand for new user services. For meeting the requirements needed to overcome the associated problems, new numbering schemes are being proposed. Such schemes would not only relieve the extra burden on conventional geographical area codes due to the addition of vast numbers of wirele

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Tian, Xizhen. "Investigation of HBT preamplification for high speed optical communication systems." Thesis, University of Ottawa (Canada), 2002. http://hdl.handle.net/10393/6273.

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A noise analysis for a Common-Collector-Cascode traveling wave HBT preamplifier is developed, resulting in an expression for the preamplifier's equivalent input noise current density. A photoreceiver, consisting of a P-I-N and GaAs HBT MMIC distributed amplifier, was implemented using Nortel's GaAs HBT (f T = 70GHz) process. The noise performance of the P-I-N preamplifier was predicted based on the noise analysis equations. The P-I-N preamplifier, having a measured bandwidth of 22GHz, displayed a measured average equivalent input noise current density of 24 pA/Hz . Good agreement was obtaine

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Saleh, Kassem Afif. "Synthesis methods for the design and validation of communication protocols." Thesis, University of Ottawa (Canada), 1991. http://hdl.handle.net/10393/7786.

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Communication protocol design consists essentially of the construction of interacting protocol entities which cooperate to provide a set of specified services to the service users. Protocol validation or design verification is a pre-implementation phase in the protocol development process which is essential for the detection of design errors such as deadlocks and incompleteness (unspecified receptions). The conventional analytic approach to protocol design consists of iteratively specifying a protocol in an informal manner, then validating it by analytic methods and correcting it until it beco

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Ying, Weidong Larry 1968. "Verification and re-design of communication interfaces with heterogeneous timing." Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=34002.

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In this thesis we use a novel refinement-based technique to formally verify data transfer in an asynchronous timing framework. Novel data transfer models are proposed to represent the implicit relationship between clock and data validity events. We construct comprehensive implementation models for a previously published GALS architecture for on-chip systems [MVK+99]. Applying our techniques on this claimed to be hazard-free architecture, we find several hazards, and other dangers, together with additional delay constraints to avoid some of the detected dangers.<br>We further exam re-design iss

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Ho, Wen Tsern 1977. "Clock and data recovery circuitry for high speed communication systems." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=82494.

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The maturing of the telecommunications industry has seen the development and implementation of devices that work at high frequencies of the electromagnetic spectrum. With the rapid deployment of optical networks, there is an increasing demand for low-cost and efficient communications circuitry. In order to interface with such high frequency signals at lower cost, there has been a recent push for very high frequency circuits using low-cost fabrication technologies like digital CMOS.<br>This thesis investigates the usage of legacy architectures and the implementation of different topologi

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Redfern, Arthur John. "Data aided and blind equalization of nonlinear communication channels." Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/13446.

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Qiu, Song. "Molecular communication systems : design, modelling and experimentation." Thesis, University of Warwick, 2017. http://wrap.warwick.ac.uk/95162/.

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Molecular Communications (MC) is an increasingly attractive technique to enable the communication and networking of devices in environments where traditional communication techniques may not be suitable. MC has been used to convey information in both human society and in animal populations and been studied on both the microscale and the macroscale. On the basis of these studies, this thesis focuses on characterising MC channel models under different environments and examining the impact these models have on the communication performance. The thesis begins by reviewing the latest developments i

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Lu, Yi. "Error correction codes for molecular communication systems." Thesis, University of Warwick, 2016. http://wrap.warwick.ac.uk/88085/.

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Molecular communications (MC) is a bio-inspired paradigm that aims to utilise molecules to exchange information among nano-machines. Given the tiny devices used in a MC system and the feasibility of MC in biological environments, MC can be applied to many applications ranging from the healthcare to manufacturing fields. In order to better realize these applications in the future, this Ph.D. research is dedicated to the investigation of a more functional, precise and reliable Diffusion-based Molecular Communications (DBMC) system. To achieve this goal, the contributions of this thesis are as fo

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Monti, Jean-Marc. "Interprocessor communication supports for a multiprocessor dataflow machine." Thesis, McGill University, 1991. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=60009.

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The dataflow model of computation offers a powerful alternative to the von Neumann based model for exploiting the fine-grain parallelism inherent in scientific computations. Under this model, a program is expressed in the form of a graph, where the data values are carried by tokens, moving on the arcs of the graph. A distinctive feature of dataflow computers is the absence of the conventional program counter. Instead, instruction execution is solely determined by the availability of data which provides ample instruction level fine-grain parallelism. A highly pipelined static dataflow architect

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Zine, El-Abidine Khaldoune. "A development framework for efficient uniform control of heterogeneous communication networks." Thesis, University of Ottawa (Canada), 2002. http://hdl.handle.net/10393/6374.

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As new Internet networking technologies appear, there is a growing need for efficient control of Network Elements (NE) (i.e. routers, switches, etc.). However, today's NE control is largely a manual activity, therefore inefficient and unscalable, and the inherent heterogeneous nature of complex networks---that is, the fact that NEs are of different technologies and have different functionality and configuration-management interfaces---makes NE control even more difficult and challenging. This thesis presents a solution that allows the development of automated, distributed web-based control of

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Dupré, la Tour Irénée. "A secure authentication infrastruture for mobile communication services over the Internet." Thesis, University of Ottawa (Canada), 2001. http://hdl.handle.net/10393/9401.

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Mobile communication on the Internet sets more security concerns than traditional mobile networks such as GSM. The network infrastructure registration process should give credentials to the user to let him or her being identified by any service provider in order to prevent fraudulent use. In addition, a user should be able to communicate with privacy and to sign a message (e.g. a payment order) so that billing is possible. Users should be able to connect from everywhere, with various types of terminals, possibly mobile. In this thesis, we propose to secure an infrastructure providing telecommu

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Das, Aniruddha. "Optimizing symbol timing, frequency spacing, and SNR estimation for communication systems." Thesis, University of California, San Diego, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=3567533.

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<p>This dissertation presents techniques to improve the performance of both coherent as well as non-coherent wireless communication systems via optimizing symbol timing, frequency spacing and by making efficient SNR estimations. We show that some of the design choices made in traditional systems are not optimal and demonstrate the gains that may be achieved by making unconventional, but judicious, choices for these parameters. </p><p> We start in the area of coherent multi-antenna communications where we introduce an offset between the symbol boundaries of the transmitted waveforms from the

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Chase, Robert. "Microcontroller based handheld acoustic communication & power delivery through metallic barriers." Thesis, Rensselaer Polytechnic Institute, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=1547915.

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<p> The ability to reliably transmit data through metallic barriers without intrusive procedures like hole drilling is useful, and sometimes necessary, for the safety of personal and equipment in hazardous conditions. Examples include submarine hulls, space vehicles, and nuclear reactors. Traditional means of communication via conductive wires compromise the integrity of the metal vessels while traditional wireless communications solutions like WiFi are limited by Faraday shielding imposed by metallic barriers. Acoustic communication solutions to this problem have been explored over the past

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Fan, Yongquan. "Accelerating jitter and BER qualifications of high speed serial communication interfaces." Thesis, McGill University, 2010. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=86531.

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High-Speed Serial Interface (HSSI) devices have witnessed an increased use in communications. As a measure of how often bit errors happen, Bit Error Rate (BER) performance is of paramount importance in any communication interface. The bit errors in HSSIs are in large part due to jitter. This thesis investigates the topic of accelerating the jitter and BER testing and characterization [1].<br>The thesis first proposes a new algorithm, suitable for extrapolating the receiver jitter tolerance performance from higher BER regions down to the 10-12 level or lower [2]. This algorithm enables us to pe

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Kipens, George. "A Saw-based commutation signaling modem for broadband indoor wireless communication /." Thesis, McGill University, 1997. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=27998.

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Commutation signaling is a bandwidth expanding modulation scheme that is robust to multipath induced intersymbol interference. Surface Acoustic Wave (SAW) technology is very suitable for implementing high-speed commutation signaling modems. A SAW-based commutation signaling modem for broadband indoor wireless communication is described. The differential coherent detector is a key element since it performs IF matched filtering and differentially coherent demodulation of the received signal. A commutation signaling differential coherent detector has been implemented using SAW and analog silicon

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Fayad, Ghassan. "Co-design and communication synthesis of embedded systems for multimedia applications." Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=31050.

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In this thesis, we present a methodology for the modeling and implementation of SoC's targeted for the fast growing multimedia applications market. Our co-design approach aims at shortening the design cycle and requires a separation of the internal behavior from the interface behavior for the design blocks. We propose to use, SystemC, a recently introduced description language. SystemC promises a homogeneous design flow and allows to take advantage of C++ expressiveness to model the system. An approach for abstracting and synthesizing the interfaces is proposed. A methodology that minimizes th

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Al-Turki, Faisal Ali 1964. "Quick simulation of multi-channel direct sequence spread spectrum communication systems." Thesis, The University of Arizona, 1992. http://hdl.handle.net/10150/278110.

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In evaluating the BER for direct sequence spread spectrum multiple-access communication systems, it is very difficult to obtain a closed form expression for the output of these systems. Therefore one usually resort to simulation techniques such as the Monte Carlo method to evaluate the BER. The BER is usually small for these systems, hence an excessive amount of time and computations is required to adequately estimate the BER. One way to circumvent this problem is to utilize importance sampling method, which will give a good estimate for the BER with relatively small number of simulation runs.

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Garg, Kamal. "Ultra Wideband Antennas for Personal Communication Devices." FIU Digital Commons, 2001. https://digitalcommons.fiu.edu/etd/3842.

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The objective of this thesis is to determine and analyze the characteristics of ultra wideband antennas for personal communication systems. For this purpose a diamond dipole antenna, an ultra wideband antenna designed by Time Domain Corp, is studied and various parameters, like Sil and the VSWR of the antenna are calculated. These parameters are determined by simulating the antenna using the XFDTD software and the MultiStrip program. The results thus obtained are validated by measurements on the network analyzer using the antenna model. A bowtie antenna with the same dimensions as the diamond

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Zeng, Yu. "Adaptive modulation schemes for optical wireless communication systems." Thesis, University of Warwick, 2010. http://wrap.warwick.ac.uk/3837/.

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High-speed wireless optical communication links have become more popular for personal mobile applications. This is a consequence of the increasing demand from the personal information service boom. Compared to the radio frequency domain, optical wireless communication offers much higher speeds and bit rates per unit power consumption. As stated by the official infrared standard IrDA optical communication enjoys much lower power consumption than Bluetooth, with an inherent security feature while in Line of Sight (LOS) applications. There are also drawbacks such as the infrared radiation cannot

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Balasubramanyam, Ramkumar. "Adaptive iterative multiuser detection for wireless communication systems." Thesis, University of Greenwich, 2008. http://gala.gre.ac.uk/8203/.

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Wireless multi-user communication systems that operate in a low signal to interference noise ratio (SINR) region are studied in this thesis. This thesis examines a class of wireless communication systems that employs an adaptive receiver for multi-user symbol detection that operates in a low SINR (< 5 dB) region. Since the knowledge of channel-parameter estimates is unavailable at the receiver, a pilot (training) sequence is applied in the communication system, to learn the channel state information (CSI) at the receiver. In studying the classical view of a DFE, the mean square error (MSE) beh

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Piels, Molly. "Si/Ge photodiodes for coherent and analog communication." Thesis, University of California, Santa Barbara, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3612014.

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<p> High-speed photodiodes have diverse applications in wireless and fiber communications. They can be used as output stages for antenna systems as well as receivers for fiber optic networks. Silicon is an attractive substrate material for photonic components for a number of reasons. Low cost manufacturing in CMOS fabrication facilities, low material loss at telecommunications wavelengths, and relatively simple co-packaging with electronics are all driving interest in silicon photonic devices. Since silicon does not absorb light at telecommunications wavelengths, photodetector fabrication requ

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