Dissertations / Theses on the topic 'Multiplexing'
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Hoffmann, Ceilidh 1969. "Code-division multiplexing." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/28746.
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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2004.Includes bibliographical references (p. 395-404).
(cont.) counterpart. Among intra-cell orthogonal schemes, we show that the most efficient broadcast signal is a linear superposition of many binary orthogonal waveforms. The information set is also binary. Each orthogonal waveform is generated by modulating a periodic stream of finite-length chip pulses with a receiver-specific signature code that is derived from a special class of binary antipodal, superimposed recursive orthogonal code sequences. With the imposition of practical pulse shapes for carrier modulation, we show that multi-carrier format using cosine functions has higher bandwidth efficiency than the single-carrier format, even in an ideal Gaussian channel model. Each pulse is shaped via a prototype baseband filter such that when the demodulated signal is detected through a baseband matched filter, the resulting output samples satisfy the Generalized Nyquist criterion. Specifically, we propose finite-length, time overlapping orthogonal pulse shapes that are g-Nyquist. They are derived from extended and modulated lapped transforms by proving the equivalence between Perfect Reconstruction and Generalized Nyquist criteria. Using binary data modulation format, we measure and analyze the accuracy of various Gaussian approximation methods for spread-spectrum modulated (SSM) signalling ...
We study forward link performance of a multi-user cellular wireless network. In our proposed cellular broadcast model, the receiver population is partitioned into smaller mutually exclusive subsets called cells. In each cell an autonomous transmitter with average transmit power constraint communicates to all receivers in its cell by broadcasting. The broadcast signal is a multiplex of independent information from many remotely located sources. Each receiver extracts its desired information from the composite signal, which consists of a distorted version of the desired signal, interference from neighboring cells and additive white Gaussian noise. Waveform distortion is caused by time and frequency selective linear time-variant channel that exists between every transmitter-receiver pair. Under such system and design constraints, and a fixed bandwidth for the entire network, we show that the most efficient resource allocation policy for each transmitter based on information theoretic measures such as channel capacity, simultaneously achievable rate regions and sum-rate is superposition coding with successive interference cancellation. The optimal policy dominates over its sub-optimal alternatives at the boundaries of the capacity region. By taking into account practical constraints such as finite constellation sets, frequency translation via carrier modulation, pulse shaping and real-time signal processing and decoding of finite-length waveforms and fairness in rate distribution, we argue that sub-optimal orthogonal policies are preferred. For intra-cell multiplexing, all orthogonal schemes based on frequency, time and code division are equivalent. For inter-cell multiplexing, non-orthogonal code-division has a larger capacity than its orthogonal
by Ceilidh Hoffmann.
Ph.D.
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Winkler, Paul Sebastian, and Paul Sebastian Winkler. "Single Element Multiplexing and De-multiplexing System for Free Space OAM Communications." Thesis, The University of Arizona, 2017. http://hdl.handle.net/10150/626718.
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Orbital Angular Momentum (OAM) modes promise an exciting future for communications due to the infinite number available and their orthogonal nature. However modern implementations of OAM mode communications utilize a multi-element approach to multiplexing. This multi-element approach wastes power and becomes increasingly complex and expensive as the number of modes in the system increases. This makes the multi-approach method not scalable. In this thesis we explore single element OAM multiplexing and de-multiplexing. A system utilizing single element multiplexer and de-multiplexer, was designed built and qualified. We have demonstrated that such a system can easily achieve a BER of less than 1% and is thusly feasible.
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Wu, Jiangfeng. "Wavelet packet division multiplexing." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0002/NQ42889.pdf.
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Herbland, Anthony Joël Michel. "Digital video multiplexing architecture." Thesis, University of Hertfordshire, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.440162.
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Gupta, Diwaker. "Scalable virtual machine multiplexing." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2009. http://wwwlib.umi.com/cr/ucsd/fullcit?p3338860.
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Thesis (Ph. D.)--University of California, San Diego, 2009.Title from first page of PDF file (viewed January 13, 2009). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 158-165).
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Edlich, Thomas [Verfasser]. "Recursive Spatial Multiplexing / Thomas Edlich." Kassel : Kassel University Press, 2013. http://d-nb.info/1056983698/34.
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Shalmon, Michael S. "Queues and packet multiplexing networks." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=71999.
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This thesis has to do with certain fundamental queues that are well established as models for delay in simple packet-switching concentrators and networks. We first revisit the single server queue with Poisson arrivals and general independent service times. We then work out a complete delay analysis for a traffic concentrating tandem network of queues with deterministic service and batch Poisson sources connected to every node; this is the most comprehensive analysis available for a network which is not of Jackson type. We also show how to (partially) extend the analysis to a concentrating tree network, and to an arrival process somewhat more general that batch Poisson.The two parts of the thesis have a close methodological relationship. Our contribution in both cases is to rederive certain known results, and to produce a variety of new ones, using techniques that are essentially qualitative. Our particular view of the stochastic processes in question is guided by a very special queue discipline, namely Last Come First Served preemptive resume; by identifying certain structural features of the sample paths, one can read, almost without calculation, a host of statistics of common interest. The LCFS preemptive resume discipline also enables us: (i) to strengthen the connection between the single server queue with general independent service times and interarrival times, and the fluctuation theory of random walks; (ii) to strengthen the connection between the queue with Poisson arrivals and branching processes.
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Christiansen, Michael G. (Michael Gary). "Magnetothermal multiplexing for biomedical applications." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/111248.
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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 2017.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 170-176).
Research on biomedical applications of magnetic nanoparticles (MNPs) has increasingly sought to demonstrate noninvasive actuation of cellular processes and material responses using heat dissipated in the presence of an alternating magnetic field (AMF). By modeling the dependence of hysteresis losses on AMF amplitude and constraining AMF conditions to be physiologically suitable, it can be shown that MNPs exhibit uniquely optimal driving conditions that depend on controllable material properties such as magnetic anisotropy, magnetization, and particle volume. "Magnetothermal multiplexing," which relies on selecting materials with substantially distinct optimal AMF conditions, enables the selective heating of different kinds of collocated MNPs by applying different AMF parameters. This effect has the potential to extend the functionality of a variety of emerging techniques with mechanisms that rely on bulk or nanoscale heating of MNPs. Experimental investigations on methods for actuating deep brain stimulation, drug release, and shape memory polymer response are summarized, with discussion of the feasibility and utility of applying magnetothermal multiplexing to similar systems. The possibility of selective heating is motivated by a discussion of various models for heat dissipation by MNPs in AMFs, and then corroborated with experimental calorimetry measurements. A heuristic method for identifying materials and AMF conditions suitable for multiplexing is demonstrated on a set of iron oxide nanoparticles doped with various concentrations of cobalt. Design principles for producing AMFs with high amplitude and ranging in frequency from 15kHz to 2.5MHz are explained in detail, accompanied by a discussion of the outlook for scalability to clinically relevant dimensions. The thesis concludes with a discussion of the state of the field and the broader lessons that can be drawn from the work it describes.
by Michael G. Christiansen.
Ph. D.
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Znamenshchykov, Y. V. "Application of matrix multiplexing method." Thesis, Сумський державний університет, 2012. http://essuir.sumdu.edu.ua/handle/123456789/28622.
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Xie, Nian. "Distributed cooperative spatial multiplexing system." Thesis, University of York, 2014. http://etheses.whiterose.ac.uk/7650/.
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Multiple-Input-Multiple-Output (MIMO) spatial multiplexing systems can increase the spectral efficiency manyfold, without extra bandwidth or transmit power, however these advantages are based on the assumption that channels between different transmit antenna and receive antenna are independent which requires the elements in antenna array be separated by several wavelengths. For small mobile devices, the requirement is difficult to implement in practice. Cooperative spatial multiplexing (C-SM) system provides a solution: it organizes antennas on distributed mobile stations to form a virtual antenna array (VAA) to support spatial multiplexing. In this thesis, we propose a novel C-SM system design which includes a transmitter with two antennas, a single antenna receiver and a relay group with two single antenna relays. In this design, we assume that the transmitter tries to transmit two coded independent messages to the receiver simultaneously but the transmitter-receiver link is too weak to support the transmission. Thus a relay group is introduced to help with the transmission. After relays receive the messages from the transmitter via a $2\times 2$ MIMO link, they first detect and quantize the received messages, then compress them independently according to the Slepian and Wolf theorem, the compressed messages are sent to the receiver simultaneously where de-compression and de-quantization are performed on the received messages. After that the resulting messages are combined to estimate the original coded messages. The estimated coded messages are decoded to produce the original messages. The basic system structure is studied and an analytical bit error rate expression is derived. Several transmission protocols are also introduced to enhance the system BER performance. The merit of this design is focus on the relay destination link. Because the Slepian and Wolf theorem is applied on the relay-destination link, messages at the relays can be compressed independently and de-compressed jointly at the receiver with arbitrarily small error probability but still achieve the same compression rate as a joint compression scheme does. The Slepian and Wolf theorem is implemented by a joint source-channel code in this thesis. Several schemes are introduced and tested, the testing results and performance analysis are given in this thesis. According to the chief executive officer (CEO) problem in the network information theory, we discover an error floor in this design. An analytical expression for this error floor is derived. A feedback link is also introduced from the receiver to the relays to allow the relays to cooperatively adapt their compression rates to the qualities of the received messages. Two combination schemes at the receiver are introduced, their performances are examined from the information theory point of view, the results and performance analysis are given in this thesis. As we assume that the relay destination link is a multiple access channel (MAC) suffers from block Rayleigh fading and white Gaussian noise, the relationship between the MAC channel capacity and the Slepian and Wolf compression rate region is studied to analyse the system performance.
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OLIVIERI, BRUNO SAPHA. "INTERROGATION SYSTEM OF FIBER BRAGG GRATING SENSORS USING TIME DIVISION MULTIPLEXING AND WAVELENGTH DIVISION MULTIPLEXING." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2004. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=5905@1.
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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIORUm sistema de interrogação de sensores a rede de Bragg utilizando multiplexação no tempo e multiplexação no comprimento de onda é proposto e demonstrado. O sistema apresenta uma solução para a medição de grandezas associadas ao espectro de reflexão de redes de Bragg, possibilitando o aumento do número de sensores a rede de Bragg monitorados através de grandes distâncias em uma mesma fibra óptica, sem um aumento significativo dos custos. O aspecto inovador deste sistema reside na particular associação das seguintes características: o uso de fonte pulsada de banda larga, a disposição, em série, de um grande número de sensores a rede de Bragg de baixa refletividade, a técnica de reutilização dos mesmos comprimentos de onda nominais em grupos contendo vários sensores com comprimentos de onda nominais distintos e um processo de filtragem espectral e análise de sinais pulsados utilizando o filtro DWDM comercial. Aspectos teóricos e experimentais considerando os princípios de trabalho desta técnica são discutidos. Comparações entre resultados simulados e experimentais do sistema implantado mostram boa concordância. Resultados experimentais apontam uma faixa dinâmica de 1,7 nm, podendo encontrar aplicações em medição de temperatura com uma faixa de 150°C. Incertezas com valores médios abaixo de 20 picometros foram obtidas. Simulações experimentais apontam a possibilidade de utilização de um número de aproximadamente 70 sensores com 0,4% de refletividade, por comprimento de onda. Considerando a largura de banda do dispositivo DWDM (1539- 1565 nm) utilizado neste sistema, e um espaçamento de 7 nm por comprimento de onda nominal de sensor, extrapolações mostram que este número pode chegar a 210 sensores em três diferentes comprimentos de onda nominais de sensor. Considerando as bandas C e L este número pode chegar a aproximadamente 1000 sensores em 14 diferentes comprimentos de onda nominais de sensor.
An interrogation system of fiber Bragg grating sensors using time division multiplexing and wavelength division multiplexing is proposed and demonstrated. The system presents a solution to measure the magnitudes associated to the reflection spectrum of the fiber Bragg gratings, making possible to increase the number of the Bragg gratings sensors monitored through large distances at the same fiber optic, without a great increase in the costs. The innovative aspect of this system is the particular association of the following characteristics: the use of a pulsed broad band source, the disposition, in series, of a large number of low reflectivity Bragg gratings sensors, the reusing technique of the same nominal wavelengths in groups containing several numbers of sensors with distinct nominal wavelengths, and a spectral analyzing and filtering process of pulsed signals using a commercial DWDM filter. Theoretical and experimental aspects regarding the working principles of this technique are discussed. Comparisons between experimental and simulated results show a good agreement. Experimental results indicate that a dynamic range of 1,7 nm was obtained. It can be used in temperature measurement systems, with a 150°C range. Uncertainties equivalent to approximately 20 picometers was obtained. Experimental simulations indicate that it would be possible to use a number of approximately 70 sensors with 0,4% reflectivity at each nominal sensor wavelength. Considering the DWDM filter bandwidth (1539-1565 nm) used in this system, and a spectral separation of 7 nm by nominal sensor wavelength, extrapolations indicate that a number of 210 sensors can be obtained, in three different nominal sensor wavelength. Using the C-band and the L-band, a number of 1000 sensors can be obtained, in fourteen different nominal sensor wavelength.
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Parker, Michael Charles. "Dynamic holograms for wavelength division multiplexing." Thesis, University of Cambridge, 1997. https://www.repository.cam.ac.uk/handle/1810/251616.
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Ahmadvand, Nima. "Wavelength division multiplexing cross connect networks." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ30066.pdf.
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Meijerink, Arjan. "Coherence multiplexing for optical communication systems." Enschede : University of Twente [Host], 2005. http://doc.utwente.nl/50841.
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Srinivas, B. S. "Wavelength division multiplexing technology and systems /." This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-03042009-040832/.
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Bean, Nigel Geoffrey. "Statistical multiplexing in broadband communication networks." Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282808.
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El-Shafei, Ahmed. "Time multiplexing of cellular neural networks." Thesis, University of Kent, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365221.
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Srinivas, Bindignavile S. "Wavelength division multiplexing technology and systems." Thesis, Virginia Tech, 1990. http://hdl.handle.net/10919/41416.
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Recio, Adolfo Leon. "Spectrum-Aware Orthogonal Frequency Division Multiplexing." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/30193.
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Reconfigurable computing architectures are well suited for the dynamic data flow processing requirements of software-defined radio. The software radio concept has quickly evolved to include spectrum sensing, awareness, and cognitive algorithms for machine learning resulting in the cognitive radio model.
This work explores the application of reconfigurable hardware to the physical layer of cognitive radios using non-contiguous multi-carrier radio techniques. The practical tasks of spectrum sensing, frame detection, synchronization, channel estimation, and mutual interference mitigation are challenges in the communications and the computing fields that are addressed to optimally utilize the capacity of opportunistically allocated spectrum bands.
FPGA implementations of parameterizable OFDM and filter bank multi-carrier (FBMC) radio prototypes with spectrum awareness and non-contiguous sub-carrier allocation were completed and tested over-the-air. Sub-carrier sparseness assumptions were validated under practical implementation and performance considerations. A novel algorithm for frame detection and synchronization with mutual interference rejection applicable to the FBMC case was proposed and tested.Ph. D.
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Josiam, Kaushik M. "Diversity multiplexing tradeoff in wireless networks." Ann Arbor, Mich. : ProQuest, 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3288754.
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Thesis (Ph.D. in Electrical Engineering)--S.M.U., 2007.Title from PDF title page (viewed Nov. 19, 2009). Source: Dissertation Abstracts International, Volume: 68-11, Section: B, page: 7544. Adviser: Dinesh Rajan. Includes bibliographical references.
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Haylock, Benjamin. "Integrated Photonic Multiplexing for Quantum Information." Thesis, Griffith University, 2018. http://hdl.handle.net/10072/381123.
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Herewithin we present multiplexed integrated photonics as a realisable route to large-scale quantum technologies. Quantum photonics is one many platforms for experimental demonstrations of quantum information science. The technological advantages afforded by the combination of integrated photonic circuits with multiplexing techniques can enable performance enhancements to make photonics a leading infrastructure for implementation of real-world quantum information systems.
For this purpose, we create integrated circuits to solve technical challenges in the fields of quantum cryptography, discrete variable and continuous variable quantum computation. These circuits were fabricated in a facility developed at Griffith University, Centre for Quantum Dynamics, for the production of annealed and reverse proton exchange waveguides in congruent lithium niobate and have found applications across the fields of quantum optics and cryptography.
We develop and demonstrate the first integrated many-mode active optical demultiplexing of single photons from a solid-state source. This scheme enables the production of a multiphoton Fock state across multiple spatial modes from a single high brightness solid-state source with temporal indistinguishability. This work addressed a major hurdle in the development of photonic quantum computers, namely generation of a large number of indistinguishable single photons on demand. To perform the demultiplexing of single photons we develop two key technologies; a high-speed 1:4 integrated photonic switch and a many channel arbitrary pulse sequence generator.
Cryptography as a field is increasingly reliant on quantum random number generators for added security. With increased demand comes a requirement for higher bitrate random number generators, and as such we demonstrate multiplexing of a random number generation scheme based on measurements of quantum vacuum fluctuations. Furthermore, we show an increased level of security at high bitrates by implementing a new signal processing scheme
We demonstrate integrated generation, manipulation and homodyning of squeezed light on a single chip for the first time. This scheme is the first successful demonstration of full integration of all the major components needed for continuous variable quantum computation in a temporally multiplexed architecture. These results represent contributions to several fields of study, demonstrating the advantages of integrated quantum photonic multiplexing, and are of interest to the quantum computing, information security, integrated optics, and electronic control communities.Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Environment and Sc
Science, Environment, Engineering and Technology
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García, Ordoñez Luis. "Perfomance limits of spatial multiplexing mimo systems." Doctoral thesis, Universitat Politècnica de Catalunya, 2009. http://hdl.handle.net/10803/22735.
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Los canales multiple-input multiple-output (MIMO) proporcionan una forma abstracta y general de modelar un gran número de sistemas de comunicaciones. Los canales MIMO inalámbricos, en concreto, han despertado un gran interés en la comunidad investigadora durante la última década, puesto que aportan mejoras significativas en términos de eficiencia espectral y fiabilidad frente a los sistemas single-input single-output (SISO) tradicionales.
Esta tesis se concentra en sistemas MIMO de multiplexado espacial con conocimiento perfecto de canal (CSI) en ambos lados del enlace de comunicaciones. Las técnicas de multiplexado espacial engloban a todos aquellos sistemas de transmisión MIMO que dividen el flujo de datos de entrada en múltiples subflujos independientes para transmitirlos después de forma simultánea. Cuando se posee CSI perfecto en transmisión, la adaptación de dichos subflujos al estado del canal resulta en notables mejoras de las prestaciones del sistema de comunicaciones. Dentro de esta filosofía destacan los transceptores MIMO lineales por su gran relevancia práctica.
El diseño de transceptores MIMO lineales se ha abordado extensivamente en la literatura durante las tres últimas décadas bajo una gran variedad de criterios de optimización. Las prestaciones de estos esquemas, en cambio, no se han investigado analíticamente, de forma que medidas de rendimiento tales como la probabilidad de error de bit promedio (BER) y la probabilidad de outage se han evaluado mediante simulaciones numéricas, las cuales no proporcionan una visión intuitiva del comportamiento del sistema. Los análisis teóricos, en cambio, ayudan a identificar los grados de libertad en el diseño y a comprender mejor su impacto en las prestaciones obtenidas. La presente tesis parte de esta necesidad y proporciona una caracterización analítica de la BER promedio y la probabilidad de outage bajo diferentes modelos de canal. El régimen de alta relación señal a ruido (SNR) ha recibido una atención especial y las prestaciones del sistema se han investigado desde dos puntos de vista diferentes. En primer lugar, adoptando una perspectiva más práctica, hemos caracterizado las curvas de BER promedio y probabilidad de outage en términos de dos parámetros clave: la ganancia en diversidad y la ganancia de agrupación. A continuación nos hemos centrado en el marco del diversity and multiplexing tradeoff.
De esta forma, hemos podido analizar conjuntamente la capacidad del sistema para tratar con la naturaleza aleatoria del canal pero, también, la capacidad de acomodar una tasa de transmisión superior cuando la SNR crece.
En esta tesis se han evaluado las prestaciones de los transceptores MIMO lineales analíticamente y de forma simultánea para los modelos de canal MIMO inalámbricos más comunes, tales como el canal Rayleigh incorrelado o semicorrelado, o el canal Ricean incorrelado. Para alcanzar este objetivo, hemos obtenido una formulación general que unifica la caracterización probabilística de los autovalores de matrices aleatorias Hermíticas con una determinada estructura, que incluye los modelos de canal anteriores como casos particulares. En efecto, la formulación propuesta y los resultados obtenidos proporcionan un marco sólido para el análisis de las prestaciones de los sistemas MIMO, pero también pueden ser muy útiles en otras áreas del procesado estadístico de la señal y las comunicaciones.
Finalmente, como conclusión al análisis realizado en esta tesis, se han evidenciado las limitaciones inherentes a los sistemas prácticos de multiplexado espacial con conocimiento de canal estudiados. En consecuencia, se han propuesto esquemas alternativos que tratan dichas limitaciones y superan las prestaciones de los diseños prácticos disponibles en la literatura.Multiple-input multiple-output (MIMO) channels are an abstract and general way to model many different communication systems of diverse physical nature. In particular, wireless MIMO channels have been attracting a great interest in the last decade, since they provide significant improvements in terms of spectral efficiency and reliability with respect to single-input single-output (SISO) channels. In this thesis we concentrate on spatial multiplexing MIMO systems with perfect channel state information (CSI) at both sides of the link. Spatial multiplexing is a simple MIMO transmit technique that does not require CSI at the transmitter and allows a high spectral efficiency by dividing the incoming data into multiple independent substreams and transmitting each substream on a different antenna. When perfect CSI is available at the transmitter, channel-dependent linear precoding of the data substreams can further improve performance by adapting the transmitted signal to the instantaneous channel eigen-structure. An example of practical relevance of this concept is given by linear MIMO transceivers, composed of a linear precoder at the transmitter and a linear equalizer at the receiver. The design of linear MIMO transceivers has been extensively studied in the literature for the past three decades under a variety of optimization criteria. However, the performance of these schemes has not been analytically investigated and key performance measures such as the average bit error rate (BER) or the outage probability have been obtained through time-comsuming Monte Carlo simulations. In contrast to numerical simulations, which do not provide any insight on the system behavior, analytical performance expressions help the system designer to identify the degrees of freedom and better understand their influence on the system performance. This thesis attempts to fill this gap by providing analytical average and outage performance characterizations in some common MIMO channel models. More exactly, we derive exact expressions or bounds (depending on the case) for the average BER and the outage probability of linear MIMO transceivers designed under a variety of design criteria. Special attention is given to the high signal-to-noise ratio (SNR) regime, where the system performance is investigated under two different perspectives. First, from a more practical point-of-view, we characterize the average BER and outage probability versus SNR curves in terms of two key parameters: the diversity gain and the array gain. Then, we focus on the diversity and multiplexing tradeoff framework in order to take into consideration the capability of the system to deal with the fading nature of the channel, but also its ability to accommodate higher data rates as the SNR increases. The performance of linear MIMO transceivers is simultaneously analyzed for the most common wireless MIMO channel models such as the uncorrelated and semicorrelated Rayleigh, and the uncorrelated Rician MIMO fading channels. For this purpose, we have obtained a general formulation that unifies the probabilistic characterisation of the eigenvalues of Hermitian random matrices with a specific structure, which includes the previous channel distributions as particular cases, i.e., the uncorrelated and semicorrelated central Wishart, the uncorrelated noncentral Wishart, and the semicorrelated central Pseudo-Wishart distributions. Indeed, the proposed formulation and derived results provide a solid framework for the analytical performance evaluation of MIMO systems, but it could also find numerous applications in other fields of statistical signal processing and communications. Finally, and as a consequence of our performance analysis, limitations inherent to all practical linear MIMO transceiver designs have been enlightened. Accordingly, new schemes have been proposed which achieve considerable performance enhancements with respect to classical linear MIMO transceivers.
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Coronel, Pedro E. "Diversity-multiplexing tradeoff in selective-fading channels /." Zürich : ETH, 2008. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17896.
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Zhang, Hua. "Orthogonal Frequency Division Multiplexing for Wireless Communications." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4960.
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OFDM is a promising technique for high-data-rate wireless communications because it can combat inter-symbol interference (ISI) caused by the dispersive fading of wireless channels. The proposed research focuses on techniques that improve the performance of OFDM-based wireless communications and its commercial and military applications. In particular, we address the following aspects of OFDM: inter-channel interference (ICI) suppression, interference suppression for clustered OFDM, clustered OFDM based anti-jamming modulation, channel estimation for MIMO-OFDM, MIMO transmission with limited feedback.
For inter-channel interference suppression, a frequency domain partial response coding (PRC) scheme is proposed to mitigate ICI. We derive the near-optimal weights for PRC that is independent on the channel power spectrum. The error floor resulting from ICI can be reduced significantly using a two-tap or a three-tap PRC. Clustered OFDM is a new technique that has many advantages over traditional OFDM. In clustered OFDM systems, adaptive antenna arrays are used for interference suppression. To calculate weights for interference suppression, we propose a polynomial-based parameter estimator to combat the severe leakage of the DFT based estimator due to the small size of the cluster. An adaptive algorithm is developed to obtain optimal performance. For high data rate military communications, we propose a clustered OFDM base spread spectrum modulation to provide both anti-jamming and fading suppression capability. We analyze the performance of uncoded and coded system. Employing multiple transmit and receive antennas in OFDM systems (MIMO-OFDM) can increase the spectral efficiency and link reliability. We develop a minimum mean-square-error (MMSE) channel estimator that takes advantage of the spatial-frequency correlations in MIMO-OFDM systems to minimize the estimation error. We investigate the training sequence design and two optimal training sequence designs are given for arbitrary spatial correlations. For a MIMO system, the diversity and array gains can be obtained by exploiting channel information at the transmitter. For MIMO-OFDM systems, we propose a subspace tracking based approach that can exploit the frequency correlations of the OFDM system to reduce the feedback rate. The proposed approach does not need recalculate the precoding matrix and is robust to multiple data stream transmission.
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Kim, Dukhyun. "Orthogonal frequency division multiplexing for digital broadcasting." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/13704.
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Bledowski, Ian A. "Frequency-division-multiplexing technique for imaging metrology." Thesis, Cranfield University, 2014. http://dspace.lib.cranfield.ac.uk/handle/1826/9286.
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An algorithm to multiplex multiple image captures simultaneously onto a single image sensor at full frame resolution was developed for imaging metrology. Parseval’s theorem was used to obtain the image intensity from image time-series of around typically 256 frames captured by the imaging sensor at typically 60 fps, though kHz frame rates are possible, hardware permitting. The time-series contained contributions from each image channel in the system, which were created by periodically modulating the intensity of the light source which defined that channel. The modulating time-series was converted to a frequency representation by Fourier transform and from that the channels could be identified by their peaks in the spectrum. Peaks corresponding to each channel were then isolated with a window function and Parseval’s theorem applied on a pixel by pixel basis to convert the signal strength back to an image containing the information from that channel only.
The FDM algorithm was then applied to two imaging metrology methods. First, an in-plane, two-channel shearography system was multiplexed with FDM in such a way as to allow time-division multiplexed measurements to be taken on the same deformations with the same instrument so as to allow comparison of results from other methods. FDM was found to produce good quality results comparable with current methods. Interferometric planar Doppler velocimetry was performed, multiplexing the reference phase channel signal and a signal channel for both a wheel and a gas jet. FDM was found to suppress the effects of phase drifts in the system which would lead to velocity offsets in the results, and gave velocities which varied from the model by only up to ~5%.
Finally, an error analysis was performed on the FDM algorithm, comparing the technique with time-averaging and single image capture through simulation and practical methods. It was shown that FDM strongly suppresses the noise and background in a measurement, and can produce good images from low intensity signals.
It could be concluded that the FDM algorithm offers significant advantages over time-averaging a signal when applied to a multi-channel imaging metrology system.
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Deng, Yu. "Coded polarization multiplexing for high-altitude platforms." Thesis, University of York, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.444290.
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Tusubira, F. F. "Low level multiplexing in cellular radio systems." Thesis, University of Southampton, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383401.
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Cowin, Michael. "Integrated polymeric components for wavelength division multiplexing." Thesis, University of Bristol, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364964.
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Wu, Qiang 1974. "Statistical multiplexing for MPEG-2 video streams." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/47634.
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Carpenter, Joel Anthony. "Holographic mode division multiplexing in optical fibres." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610803.
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Rosenthal, Glenn K. "A DSP IMPLEMENTED DIGITAL FM MULTIPLEXING SYSTEM." International Foundation for Telemetering, 1991. http://hdl.handle.net/10150/613103.
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International Telemetering Conference Proceedings / November 04-07, 1991 / Riviera Hotel and Convention Center, Las Vegas, NevadaRecent advancements in high-speed Digital Signal Processing (DSP) concepts and devices permit digital hardware implementation of relatively high-frequency signal processing, which formerly required analog circuitry. Systems utilizing this technology can provide a high degree of software programmability; improved reproducibility, reliability, and maintainability; immunity to temperature induced drift errors; and compare favorably in cost to their analog counterparts. This paper describes the DSP implementation of a software programmable, digital frequency multiplexed FM system providing up to 4 output multiplexes, containing up to 36 subcarrier channels extending up to 4 MHZ, and accommodating modulating frequencies up to 64 kHz. System overall design goals and the implementation of these goals are presented.
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Tohme, Henri Edouard. "Dual channel bidirectional wavelength division multiplexing datalink." Thesis, Virginia Tech, 1988. http://hdl.handle.net/10919/43061.
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Wavelength division multiplexing two channels on one fiber
is one approach that enables us to make use of the
extremely large bandwidth of optical fibers. We start with
an analysis of optical fibers, sources, detectors, filters
and wavelength division ,multiplexers. Then, using the
knowledge from the experimental data, we design a 20 km
bidirectional WDM datalink. The design is backed up with
theory and measurements. Fiber to the home is one of many
applications that makes use of such a design.Master of Science
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Yang, Shuang. "Multidimensional microfluidic bioseparation systems with spatial multiplexing." College Park, Md.: University of Maryland, 2008. http://hdl.handle.net/1903/8725.
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Thesis (Ph. D.) -- University of Maryland, College Park, 2008.Thesis research directed by: Dept. of Mechanical Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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Williams, Ezekiel. "An Information Theoretic Analysis of Neural Multiplexing." Thesis, Université d'Ottawa / University of Ottawa, 2020. http://hdl.handle.net/10393/40407.
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How the brain encodes information in sequences of voltage spikes is an open question. Past literature suggests the importance of bursts, high-frequency spike events, as a key step towards answering this question. In particular, it was recently shown that neurons could use bursts to communicate two streams of information simultaneously, resulting in higher information rates than seen with other neural code theories. However, it is unknown how a neuron’s spiking statistics might affect communication via this new code. To investigate the influence of spike statistics, we study a bursting neuron model with the goal of estimating its information rate as a function of its spike statistics. To this end we extend a recently proposed method for estimating information rate. We find the information rate in our burst-multiplexing model is robust to changes in spike-train statistics, providing evidence for the utility of a burst-multiplexing code to diverse brain networks.
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Modestou, Panayiotis Charalambous 1967. "Multilevel subcarrier multiplexing in optical fiber communications." Thesis, The University of Arizona, 1993. http://hdl.handle.net/10150/278280.
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The primary aim of the thesis is to determine the spectrum efficiency and power penalty of multi-level Subcarrier Multiplexing (SCM) transmission. To perform quantitative analysis, this thesis first develops a fiber transmission model. When there is one SCM transmission channel, it is found that the power penalty due to multi-level is 5 dB per bit at the same bit error rate (BER). For multiple channel SCM transmission, to reduce adjacent channel interference (ACI), it is found that binary transmission has the best spectrum efficiency for Non-Return-to-Zero (NRZ) pulses at the same BER. However, if raised-cosine pulses are used, 32-ary transmission is found to be the most efficient in spectrum use because of the smaller ACI.
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Lin, Menglan. "Functionality-multiplexing metasurfaces for electromagnetic wavefront manipulation." Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPAST052.
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Les métasurfaces à multiplexage de fonctionnalités ont attiré une attention considérable en tant que candidats prometteurs pour faire face à l'intégration et à la miniaturisation des dispositifs. De telles métasurfaces permettent d'obtenir différentes fonctionnalités à partir d'un seul dispositif. Pour développer des méta-dispositifs dans le régime des micro-ondes, certains enjeux ne peuvent pas être ignorées. Cette thèse de doctorat est consacrée à l'exploration de différentes méthodologies pour réaliser des méta-dispositifs à multiplexage de fonctionnalités, en se concentrant sur des questions critiques telles que la manipulation indépendante de l'état de spin, la large bande passante de fonctionnement, le contrôle indépendant et la régulation en temps réel. Des validations numériques et expérimentales ont été faites pour plusieurs applications de manipulation d'ondes électromagnétiques dans chaque méta-dispositif. Les travaux ont été réalisés conjointement par l'Université Paris-Saclay et Xidian University. Tout d'abord, un méta-dispositif passif de multiplexage de polarisations est développé pour réaliser une manipulation d'amplitude indépendante et une modulation complète de phase dépendante pour les états de polarisation circulaire orthogonale. Divers générateurs de faisceaux vortex sont ensuite mis en œuvre pour des états de spin orthogonaux dans une large bande de fréquences et une absorption sélective de spin à la fréquence de résonance est ciblée. Un méta-dispositif réorganisable mécaniquement est également réalisé, où une modulation de phase dynamique est obtenue en enfichant des méta-atomes dans une structure entièrement diélectrique. La capacité de ce méta-dispositif pour la manipulation du front d'onde est étudiée au travers de deux fonctionnalités dans une large bande de fréquences, à savoir des générateurs de faisceaux vortex avec des charges topologiques différentes et des hologrammes en champ proche avec des motifs d'imagerie accordables. Enfin, une métasurface reconfigurable électroniquement, constituée de méta-atomes adressables individuellement, est exploitée pour la focalisation en champ proche à différentes distances focales sur la base du mécanisme de superoscillation. De plus, des faisceaux bouteille unidimensionnels et bidimensionnels sont générés avec différents rayons de trajectoires circulairesFunctionality-multiplexing metasurfaces have attracted considerable attention as prominent candidates for coping with device integration and miniaturization. Such metasurfaces enable different functionalities to be achieved from a single device. To develop meta-devices in the microwave regime, some issues cannot be ignored. This PhD thesis is devoted to exploring different methodologies to realize functionality-multiplexing meta-devices, focusing on critical issues such as independent spin-state manipulation, wide operating bandwidth, independent controllability and real-time regulation. Numerical and experimental validation have been conducted for several applications of electromagnetic wave manipulation in each functionality-multiplexing meta-device. The work was done jointly by Université Paris-Saclay and Xidian University. First, a polarization-multiplexing passive meta-device is developed to achieve independent amplitude manipulation and dependent full-phase modulation for orthogonal circularly polarized states. Diverse vortex beam generators are then implemented for orthogonal spin-states in a wide frequency band and a spin-selective absorption at the resonance frequency is targeted. A mechanically re-organizable meta-device is also realized, where a dynamic phase modulation is achieved by plugging meta-atoms in an all-dielectric structure. The capability of this meta-device for wavefront manipulation is investigated through two functionalities in a wide frequency band, i.e., vortex beam generators with different topological charges and near-field holograms with tunable imaging patterns. Finally, an electronically reconfigurable metasurface, consisting of individually addressable meta-atom, is exploited for near-field focusing at different focal lengths based on the superoscillation mechanism. Additionally, one-dimensional and two-dimensional bottle beams are generated with different radii of circular trajectories
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Schubert, Martin. "Power aware spatial multiplexing with unilateral antenna cooperation." [S.l.] : [s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=967247063.
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Andersson, Anders. "Capacity Study of Statistical Multiplexing for IP Telephony." Thesis, Uppsala University, Department of Mathematics, 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-122600.
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Rontani, Damien. "Communications with chaotic optoelectronic systems - cryptography and multiplexing." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42810.
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With the rapid development of optical communications and the increasing amount of data exchanged, it has become utterly important to provide effective ar- chitectures to protect sensitive data. The use of chaotic optoelectronic devices has already demonstrated great potential in terms of additional computational security at the physical layer of the optical network. However, the determination of the security level and the lack of a multi-user framework are two hurdles which have prevented their deployment on a large scale. In this thesis, we propose to address these two issues.
First, we investigate the security of a widely used chaotic generator, the external cavity semiconductor laser (ECSL). This is a time-delay system known for providing complex and high-dimensional chaos, but with a low level of security regarding the identification of its most critical parameter, the time delay. We perform a detailed analysis of the influence of the ECSL parameters to devise how higher levels of security can be achieved and provide a physical interpretation of their origin.
Second, we devise new architectures to multiplex optical chaotic signals and realize multi-user communications at high bit rates. We propose two different approaches exploiting known chaotic optoelectronic devices. The first one uses mutually cou- pled ECSL and extends typical chaos-based encryption strategies, such as chaos-shift keying (CSK) and chaos modulation (CMo). The second one uses an electro-optical oscillator (EOO) with multiple delayed feedback loops and aims first at transpos- ing coded-division multiple access (CDMA) and then at developing novel strategies
of encryption and decryption, when the time-delays of each feedback loop are time- dependent.
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Buyuksahin, Oncel F. Feza. "Modulation Formats For Wavelength Division Multiplexing (wdm) Systems." Phd thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12611039/index.pdf.
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Optical communication networks are becoming the backbone of both national and international telecommunication networks. With the progress of optical communication systems, and the constraints brought by WDM transmissions and increased bit rates, new ways to convert the binary data signal on the optical carrier have been proposed.
There are different factors that should be considered for the right choice of modulation format, such as information spectral density (ISD), power margin, and tolerance against group-velocity dispersion (GVD) and against fiber nonlinear effects like self-phase modulation (SPM), cross-phase modulation (XPM), four-wave mixing (FWM), and stimulated Raman scattering (SRS).
In this dissertation, the several very important modulation formats such as Non Return to Zero (NRZ), Return to Zero (RZ), Chirped Return to Zero (CRZ), Carrier Suppressed Return to Zero (CSRZ), Differential Phase Shift Keying (PSK) and Carrier Suppressed Return to Zero- Differential Phase Shift Keying (CSRZ-DPSK) will be detailed and compared.
In order to make performance analysis of such modulation formats, the simulation will be done by using VPItransmissionMakerTM WDM software.
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Zaccarin, Denis. "Novel architectures and multiplexing strategies for optical CDMA." Thesis, University of Ottawa (Canada), 1994. http://hdl.handle.net/10393/10345.
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The work presented in this thesis explores avenues to efficiently use code-division as the multiple-access technique in optical communication systems. Coding in the time domain is first considered. Novel architectures that allow the use of bipolar codes with simple direct detection receivers are first presented, for the case of coherent optical sources. We show that a proper combination of electro-optic elements and all optical processing elements leads to encoder and decoder complexities much reduced compared to the all optical solutions, without sacrificing the chip rate. This is further enhanced when we propose the use of Kronecker sequences whose inner sequences are chosen to be perfect autocorrelation sequences. In that case, even programmability of the delay lines is not required. We then modify the proposed architecture so that they can be used with incoherent optical sources. Although the sources can only be modulated in power, we show that still bipolar codes can be used and maintain their properties. A detailed performance analysis of the proposed architectures is made, including multiple-access interference, shot noise and thermal noise. Two types of modulation: amplitude-shift-keying (ASK) and orthogonal coding (OC) are considered. Results presented give the probability of bit error as a function of the number of simultaneous users, for many code lengths values. Performances obtained using different combinations of inner and outer sequences are compared, and requirements in terms of number of delay lines and bandwidth of electro-optic elements are identified. The effect of partial cross-correlation due to non optimized optical filtering is studied by means of an upper bound on the probability of bit error. A new analytical technique is derived to analyze optical CDMA systems using coherent optical sources with direct detection. A new and highly efficient coding technique based on amplitude spectral encoding of incoherent optical sources such as light-emitting diodes is then proposed. This is one of the major contributions of this thesis. Architectures for the encoder and decoder are given, and suitable codes are identified. The proposed system is insensitive to near-far effects and has a spreading gain independent of the bit rate. This property makes this coding technique a suitable one for networks serving users with different bit rates requirements. Detailed evaluation of the probability of error is done, and practical considerations such as the spectral shape of the sources, finite extinction ratio of the amplitude mask as well as its programmability speed are quantified. We show that more than 100 simultaneous users can be accommodated with a probability of error of 10$\sp{-9}$, for a code length as small as 127. Finally, the use of this coding strategy as the routing technique for Asynchronous Transfer Mode (ATM) switches is discussed.
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Salmanian, Mazda. "Inverse multiplexing of IS95 traffic for video transmission." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0027/MQ27025.pdf.
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Zhang, Xiaomei. "A performance analysis of wireless ATM multiplexing system." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0020/MQ54323.pdf.
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Peng, Wei. "Non-linear detection algorithms for MIMO multiplexing systems." Click to view the E-thesis via HKUTO, 2007. http://sunzi.lib.hku.hk/HKUTO/record/B39558563.
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Ayani, Pasha, and Petter Gustafsson. "Impact and Multiplexing of SIP Signaling in GSM." Thesis, Linköpings universitet, Institutionen för teknik och naturvetenskap, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-94397.
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By the introduction of IMS, future mobile voice traffic will gradually be based on IP. This means that GSM has to undergo further development in order to stay compatible with other mobile networks. Before introducing VoIP into GSM, the impact of the SIP signaling needs to be investigated. Therefore, the objective of this master thesis is to simulate and evaluate how SIP signaling could be multiplexed with VoIP traffic and other MMTel services in the GSM network. In order to multiplex the SIP signaling with other traffic types, new delay sensitive scheduling algorithms have been derived and analyzed along with a dynamic allocation algorithm. The allocation algorithm provide each mobile user with a number of timeslots and frequencies used to transmit its data, while the scheduling algorithms are used to conclude which user that should get the highest priority when several users try to transmit data at the same time and on the same frequency. Unfortunately, it was not possible to receive any reliable data within the given timeframe due to bugs and errors in the simulator software. Therefore, the conclusions in this master thesis are based on our expectations on such simulations. The conclusion is that in order to maximize the number of VoIP users in the GSM system, the presence signaling should be lower prioritized than VoIP and SIP signaling. It is also concluded that the delay sensitive scheduler which is dependent on previous penalties in both the UL and DL scheduling is to be preferred when high multiplexing levels are reached. Furthermore, the throughput of the downprioritized MMTel service should not be expected to be high when the VoIP traffic is intense.
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Street, Andrew M. "Spread spectrum techniques for multiplexing and ranging applications." Thesis, University of Oxford, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.259828.
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Clark, Alan. "On Coding for Orthogonal Frequency Division Multiplexing Systems." Thesis, University of Canterbury. Electrical and Computer Engineering, 2006. http://hdl.handle.net/10092/1092.
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The main contribution of this thesis is the statistical analysis of orthogonal frequency di- vision multiplexing (OFDM) systems operating over wireless channels that are both fre- quency selective and Rayleigh fading. We first describe the instantaneous capacity of such systems using a central limit theorem, as well as the asymptotic capacity of a power lim- ited OFDM system as the number of subcarriers approaches infinity. We then analyse the performance of uncoded OFDM systems by first developing bounds on the block error rate. Next we show that the distribution of the number of symbol errors within each block may be tightly approximated, and derive the distribution of an upper bound on the total variation distance. Finally, the central result of this thesis proposes the use of lattices for encodingOFDMsystems. For this, we detail a particular method of using lattices to encode OFDMsystems, and derive the optimalmaximumlikelihood decodingmetric. Generalised Minimum Distance (GMD) decoding is then introduced as a lower complexity method of decoding lattice encoded OFDM. We derive the optimal reliability metric for GMD decod- ing of OFDM systems operating over frequency selective channels, and develop analytical upper bounds on the error rate of lattice encoded OFDM systems employing GMD decod- ing.
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李世榮 and Sai-weng Lei. "Adaptive interleaving for orthogonal frequency division multiplexing systems." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2000. http://hub.hku.hk/bib/B31224702.
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Peng, Wei, and 彭薇. "Non-linear detection algorithms for MIMO multiplexing systems." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B39558563.
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