Dissertations / Theses on the topic 'Multiple antenna'
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Nair, Sidharth. "A Multiple Antenna Global Positioning System Configuration for Enhanced Performance." Ohio University / OhioLINK, 2004. http://www.ohiolink.edu/etd/view.cgi?ohiou1090937438.
Full textGhosh, Soham. "Compact multiple-antenna structures." Thesis, McGill University, 2012. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=110651.
Full textLes systèmes de communication à entrée multiple sortie multiple, utilisant plusieurs antennes à l'émetteur et au récepteur, sont devenus omniprésents de nos jours en raison de leur capacité d'augmenter le rendement spectral et la fiabilité du système. Avec le marché de niche actuelle dans la miniaturisation des périphériques de communication, l'un des principaux problèmes est la conception d'antennes multiples avec un profile modéré. De plus, quand les antennes sont trop proche les uns des autres, le problème inné de couplage mutuel peut réduire substantiellement la capacité du système. Trouver une solution qui résout deux problèmes simultanément demeure un défi d'ingénierie compte tenu des contraintes d'espace à l'intérieur des périphériques. Ce mémoire examine la miniaturisation des antennes, la réduction du couplage mutuel, et la caractérisation de la performance des antennes dans divers scénarios avec des voies de transmissions réalistes. Les structures de bande interdite électromagnétique sont utilisées pour réduire les dimensions et le couplage mutuel dans les antennes planaires à microrubans (MPA) multiples. Ces structures peuvent être envisagées pour être incorporées dans les stations de base de technologie d'évolution à long terme (LTE) et de réseau local sans fil (WLAN). De plus, des antennes planaires F inversées (PIFA) ultra-miniatures à éléments multiples qui exploitent les diversités du motif et de la polarisation sont proposées pour les terminaux récepteurs tels que les périphériques de poche. La capacité et la performance de la diversité de ces antennes multiples sont évaluées dans l'espace libre et dans divers environnements d'évanouissement.
Evans, Daniel N. "Near-Optimal Antenna Design for Multiple Antenna Systems." Diss., CLICK HERE for online access, 2009. http://contentdm.lib.byu.edu/ETD/image/etd2796.pdf.
Full textZarei, Hossein. "RF variable phase shifters for multiple smart antenna transceivers /." Thesis, Connect to this title online; UW restricted, 2004. http://hdl.handle.net/1773/5964.
Full textSandhu, Waseem Hussain, and Muhammad Awais. "MULTIPLE ANTENNA TECHNIQUES IN WiMAX." Thesis, Blekinge Tekniska Högskola, Sektionen för ingenjörsvetenskap, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-1120.
Full textNu för tiden trådlösa nätverk såsom cellulär kommunikation har stor påverkan på människors liv och blev en viktig del av det. Kravet att köpa hög kapacitet och bättre utrustning prestanda och mobiltelefoni har snabbt ökat. Det finns mer än två hundra olika länder och nästan tre miljarder användare över hela världen som använder mobiltelefoni som Global System for Mobile (GSM), Universal Mobile Telecommunication System (UMTS), Wireless Local Area Network (WLAN) och Worldwide Interoperability för Microwave Access (WiMAX). Under det senaste decenniet har en antenn ansluten till en kommunikationsradio enhet vid samma tidpunkt, men för närvarande detta scenario har fullständigt förändrats. Att öka kapaciteten av kanalerna och för att förbättra prestandan lite fel mellan mobil station och bensinstationen, är det nu möjligt att ansluta en antenn med mer än en kommunikationsradio enhet samtidigt. Multiple Input Multiple Output (MIMO) system är utformade för att uppnå detta krav. I MIMO-system, antenner kombineras i form av små ramar som kopplingsanordningar i cellulär enheter. Mångfald innebär att få lyckad överföring och mottagning av radiosignaler i enlighet med polarisation och korrelation. På grund av mångfalden kapacitet av kanalerna och bit error rate förbättras, så att mångfald är en av de största och viktigaste egenskaper MIMO-system. Denna avhandling är betonas att studera WiMAX system genom att genomföra flera antenn teknik, genom att observera bitars prestanda felfrekvensen och datahastighet i WiMAX system med hjälp av två viktiga och som för närvarande tillämpas allmänt flera tekniker tillgång kommunikation. Forskningen kommer också att utveckla dessa metoder och förklara de grundläggande parametrarna, operationer, matematiska beräkningar och olika relevanta iakttagelser. Den simuleringsverktyg som används i denna forskning avhandling är MATLAB som också används för att illustrera resultaten med siffror och diagram.
Ray, Siddharth 1979. "Energy efficient multiple antenna communication." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/38228.
Full textIncludes bibliographical references (leaves 111-115).
We consider a multiple-input, multiple-output (MIMO) wideband Rayleigh block fading channel where the channel state is unknown at the transmitter and receiver and there is only an average input power constraint. We compute the capacity and analyze its dependence on coherence length, number of antennas and receive signal-to-noise ratio (SNR) per degree of freedom. We establish conditions on the coherence length and number of antennas for the non-coherent channel to have a "near coherent" performance in the wideband regime. We also propose a signaling scheme that is near-capacity achieving in this regime. We compute the decoding error probability and study its dependence on SNR, number of antennas and coherence length. We show that error probability decays inversely with coherence length and exponentially with the product of the number of transmit and receive antennas. Moreover, in the wideband regime, channel outage dominates error probability and the critical and cut-off rates are much smaller than channel capacity. In the second part of this thesis, we introduce the concept of a fiber aided wireless network architecture (FAWNA), which allows high-speed mobile connectivity by leveraging the speed of optical networks.
(cont.) Specifically, we consider a single-input, multiple-output (SIMO) FAWNA, which consists of a SIMO wireless channel interfaced with an optical fiber channel through wireless-optical interfaces. We propose a design where the received wireless signal at each interface is sampled and quantized before being sent over the fiber. The capacity of our scheme approaches the capacity of the architecture, exponentially with fiber capacity. We also show that for a given fiber capacity, there is an optimal operating wireless bandwidth and number of interfaces. We show that the optimal way to divide the fiber capacity among the interfaces is to ensure that each interface gets enough rate so that its noise is dominated by front end noise rather than by quantizer distortion. We also show that rather than dynamically change rate allocation based on channel state, a less complex, fixed rate allocation scheme can be adopted with very small loss in performance.
by Siddharth Ray.
Ph.D.
Gopala, Kalyana. "Multiple Antenna Communications for 5G." Electronic Thesis or Diss., Sorbonne université, 2018. http://www.theses.fr/2018SORUS352.
Full textTime Division Duplexing (TDD) Massive Multiple Input Multiple Output (MaMIMO) with a massive number of base station (BS) antennas relies on channel reciprocity to obtain Channel State Information at Transmitter (CSIT). However the overall end to end digital channel is not reciprocal due to the presence of Transmit (Tx) and Receive (Rx) chains which need to be corrected using calibration factors. Our work provides a simple and elegant expression of the Cramer Rao Bound (CRB) for calibration parameter estimation. We provide analysis for the existing least squares approaches and propose optimal algorithms to estimate the calibration parameters. We also consider beamforming for a rapidly time-varying point to point MIMO link. In an Orthogonal Frequency Division Multiplexing (OFDM) sytem, this results in inter-carrier interference (ICI). With an assumption of linear channel variation across the OFDM symbol, it is observed that the beamformer design problem is similar to that of a MIMO Interfering Broadcast Channel (IBC) beamforming design. The beamformer design takes into account receive windowing using the excess cyclic prefix and the window is jointly designed with the Tx beamformer. In addition to full CSIT, we also investigate partial CSIT approaches that maximize Expected Weighted Sum Rate (EWSR) where the Tx has only partial knowledge of the channel. First, we use a large system approximation that also works well for a small number of Tx and Rx antennas to derive the beamformers. In our work, we also analyze the possibility of using the Expected-signal- expected-interference-WSR metric instead of the EWSR. Finally, experimental results on the Eurecom MaMIMO testbed are presented
Stewart, Scot Howard. "Multiple feed reflector antenna analysis." Thesis, Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/94472.
Full textM.S.
Li, Hui. "Decoupling and Evaluation of Multiple Antenna Systems in Compact MIMO Terminals." Doctoral thesis, KTH, Elektroteknisk teori och konstruktion, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-96239.
Full textQC 20120604
Mukherjee, Souvick. "Multiple antenna microwave ablation: impact of non-parallel antenna insertion." Thesis, Kansas State University, 2015. http://hdl.handle.net/2097/19058.
Full textDepartment of Electrical and Computer Engineering
Punit Prakash
Microwave ablation is a minimally invasive therapeutic modality used for the treatment of cancer in various organs. In this procedure, microwave energy is sent through a thin antenna placed inside the tumor. The microwave energy radiated from the antenna generates heat which kills the tumor cells by necrosis. During multiple-applicator microwave ablation, geometric estimates of treatment outcome are typically obtained by assuming parallel insertion of the applicators. This assumption is based on the guidelines provided in the brochures of antenna manufacturing companies. This assumption is flawed because it is rare to insert the antennas in parallel configuration due to the flexible nature of the antennas and the presence of intervening organs. Furthermore, movement of patients during the treatment procedure alters the position of the antennas. In order to see the effect of non-parallel insertion of antennas, model-based treatment planning may be instructive. Treatment planning can also determine the changes needed to be made for prospective ablation therapy if the antennas are not positioned in their ideal parallel configuration. This thesis provides a detailed computational comparison of the skewed configurations of microwave antennas to their closest parallel configurations. The metric used for com-paring the similarity between the cases is Dice Similarity Coefficient (DSC). Experimental results to validate the computational data are also discussed. Computations were done by using realistic cases of antenna positions obtained from Rhode Island Hospital.
Lu, Di. "Antenna selection schemes for multiple-input multiple out systems." Thesis, University of Manchester, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.493529.
Full textTrujillo, Castañeda Eduardo Daniel. "Resource allocation for multiple-user multiple-antenna cellular systems." Doctoral thesis, Universidade de Aveiro, 2015. http://hdl.handle.net/10773/14078.
Full textThe thesis addresses the sum rate or spectral e ciency maximization problem in cellular systems with two main components, multiple antennas and multiple users. In order to solve such a problem, several resource allocation techniques are studied and developed for di erent cellular scenarios. The antennas at the transmitters are arranged in several con gurations, i.e., co-located or distributed and for such arrangements di erent levels of coordination and cooperation between transmitters are investigated. Accounting for more receiver antennas than transmitter antennas implies that system optimization must select the best transmitter-receiver match (combinatorial problem) which can be solved with di erent degrees of cooperation between transmitters. The system models studied can be classi ed either as interference limited or as power limited systems. In interference limited systems the resource allocation is carried out independently by each transmitter which yield power leakage to unintended receivers. For this kind of systems, the access network using distributed antenna architectures is examined. The properties of distributed antenna in cellular systems as well as the gains they provide in terms of frequency reuse and throughput are assessed. Accounting for multiple user scenarios, several techniques and algorithms for transmitter-receiver assignment, power allocation, and rate allocation are developed in order to maximize the spectral e ciency. In power limited systems the transmitters jointly allocate resources among transmit and receive antennas. The transmitters are equipped with multiple antennas and signal processing is implemented in order to suppress inter-user interference. Single-cell and multi-cell systems are studied and the problem of sum rate maximization is tackled by decoupling the user selection and the resource allocation (power and precoding) processes. The user selection is a function of the type of precoding technique that is implemented and the level of information that can be processed at the transmitter. The developed user selection algorithms exploit information provided by novel channel metrics which establish the spatial compatibility between users. Each metric provides a di erent trade-o between the accuracy to identify compatible users, and the complexity required to compute it. Numerical simulations are used to assess the performance of the proposed user selection techniques (metrics and algorithms) whose performance are compared to state-of-the-art techniques.
Esta tese descreve o problema da maximização da taxa de transmissão ou e ciência espectral em sistemas moveis tomando em atenção duas características fundamentais destes, o número de antenas e utilizadores. A fim de resolver este tipo de problema, várias técnicas de alocação de recursos foram estudadas e propostas para diferentes cenários. As antenas nos transmissores estão organizadas em diferentes configurações, podendo ser localizadas ou distribuídas e para estes esquemas, diferentes níveis de cooperação e coordenação entre transmissores foram investigados. Assumindo mais antenas receptoras do que antenas transmissoras, implica que a otimização do sistema seleccione as melhores combinações de transmissor-receptor (problema combinatório), o que pode ser concretizado usando diferentes graus de cooperação entre transmissores. Os modelos de sistemas estudados, podem ser classificados como sistemas limitados por interferência ou sistemas limitados por potência. Em sistemas limitados por interferência a alocação de recursos e feita independentemente para cada transmissor o que resulta em perda de energia para os receptores não tomados em consideração. Para este tipo de sistemas, e considerado o caso em que a rede de acesso e constituída por antenas distribuídas. Os ganhos obtidos devido ao uso de antenas distribuídas, quer em termos do planeamento de frequências quer da maximização da taxa de transmissão são considerados. Assumindo esquemas multi-utilizador, várias técnicas e algoritmos de transmissão-recepção, alocação de potência e de taxa de transmissão foram desenvolvidos para maximizar a e ciência espectral. Para sistemas limitados em potência os transmissores alocam os recursos quer de antenas de transmissão quer de recepção conjuntamente. Os transmissores estão equipados com várias antenas e o processamento de sinal e implementado de modo a eliminar a interferência entre utilizadores. Sistemas de célula única e de múltiplas células foram estudados. Para estes foi considerado o problema da maximização de taxa de transmissão o qual foi resolvido heuristicamente, através do desacoplamento do problema em duas partes, uma onde se efectua a seleção de utilizadores e outra onde se considera a alocação de recursos. A seleção de utilizadores e feita em função do tipo de técnicas de pré-codificação implementadas e do nível de informação que o transmissor possui. Os algoritmos de seleção de utilizadores desenvolvidos verificam a compatibilidade espacial entre utilizadores, usando para tal métricas propostas. Cada uma das métricas oferece um trade-off diferente entre a precisão para identificar um utilizador compatível e a complexidade necessária para a implementar. Foram usadas simulações numéricas para avaliar a performance das técnicas de seleção de utilizadores propostas (métricas e algoritmos), performance que foi comparada com as técnicas mais inovadoras.
Peel, Christian B. "Studies in multiple-antenna wireless communications /." Diss., CLICK HERE for online access, 2004. http://contentdm.lib.byu.edu/ETD/image/etd331.pdf.
Full textEl, Effendi M.-Adib. "Performance evaluation of multiple antenna systems." Thesis, The University of Wisconsin - Milwaukee, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=1550206.
Full textWireless traffic is in a continuous increase and there are growing demands for wireless systems that support higher interference suppression and noise mitigation for mobile and cellular communications. Single antenna systems use frequency or time diversity to overcome the multipath fading effect as it represents a major problem that results in sever performance degradation. However, frequency diversity is inefficient in terms of bandwidth requirements and time diversity needs slow time varying channels. Space diversity has been proposed as an alternative to the former schemes where more antennas are added to the transmitter and/or receiver. Nevertheless, when multiple antennas are used; two different gains can be employed to boost system performance represented by the space diversity gains and array gain and it is not yet clear which gain has better performance as most of the published work study each one separately. Further, there is a variety of beamforming algorithms can achieve a high array gain to mitigate noise and interference. However, because each algorithm uses a different approach to achieve this goal, an ambiguity arises in some of their performance aspects as it is possible that some algorithms may have similar performance in interference suppression but varies in their capability in mitigating noise or vice versa. This may have a big impact on their performance in some environments where the interference and noise floors vary considerably and yet no study has fully addressed this problem. In this work, multiple input multiple output antenna systems were investigated using a variety of antenna configurations and algorithms to evaluate their performance under different noise and interference levels using MATLAB software modeling tools. It was found that array gain gives higher system performance in comparison with the space diversity gain and can be considered the most optimal scheme. After analyzing the performance of different beamformers, it was found that phase shift and MVDR beamformers both have the same capability in mitigating white noise while they vary in their ability in interference suppression depending on the level of SINR of the surrounding environment. Also, Frost beamformer shows high interference suppression while its noise mitigation capability is very low which limits its use in applications where the noise floor is higher than the interference floor.
Peel, Christian Bruce. "Studies in Multiple-Antenna Wireless Communications." BYU ScholarsArchive, 2004. https://scholarsarchive.byu.edu/etd/119.
Full textRaines, Bryan Dennis. "Systematic Design of Multiple Antenna Systems Using Characteristic Modes." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1306951104.
Full textZhang, Shuai. "Investigating and Enhancing Performance of Multiple Antenna Systems in Compact MIMO/Diversity Terminals." Doctoral thesis, KTH, Elektroteknisk teori och konstruktion, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-116402.
Full textQC 20130121
EU Erasmus Mundus External Cooperation Window TANDEM
McNamara, Darren Phillip. "Characterisation and investigation of multiple-input multiple-output wireless communication channels." Thesis, University of Bristol, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.274672.
Full textAnderson, Adam L. "Unitary space-time transmit diversity for multiple antenna self-interference suppression /." Diss., CLICK HERE for online access, 2004. http://contentdm.lib.byu.edu/ETD/image/etd500.pdf.
Full textAdeane, Jaime. "Spatial diversity in wireless communications : multiple antenna systems and virtual antenna arrays." Thesis, University of Cambridge, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.613069.
Full textAyele, Mehari L. "Four-port miniaturized and highly isolated antenna for multiple-input multiple-output communication systems." Thesis, Wichita State University, 2012. http://hdl.handle.net/10057/6118.
Full textThesis (M.S.)--Wichita State University, College of Engineering, Dept. of Electrical Engineering and Computer Science
Yang, Jingnong. "Channel State Information in Multiple Antenna Systems." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/14120.
Full textStimming, Christian. "Multiple antenna concepts in OFDM transmission systems." Göttingen Cuvillier, 2009. http://d-nb.info/995846030/04.
Full textSpyropoulos, Ioannis. "Interference management in multiple-antenna wireless networks." Diss., [La Jolla] : University of California, San Diego, 2009. http://wwwlib.umi.com/cr/ucsd/fullcit?p3378675.
Full textTitle from first page of PDF file (viewed Oct. 21, 2009). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 82-86).
Subramanian, Srikanth. "A multiple-antenna-multiple-equalizer system for CDMA indoor wireless systems." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ32728.pdf.
Full textKang, Heewon. "Multiple antenna systems in a mobile-to-mobile environment." Diss., Available online, Georgia Institute of Technology, 2006, 2006. http://etd.gatech.edu/theses/available/etd-11172006-173605/.
Full textGordon L. Stuber, Committee Chair ; Guillermo Goldsztein, Committee Member ; Gregory D. Durgin, Committee Member ; John R, Barry, Committee Member ; Mary Ann Ingram, Committee Member.
Crossley, David, Morrie Drexler, and Al Waterman. "SIMPLIFIED ANTENNA DESIGN FOR TELEMETRY STATIONS." International Foundation for Telemetering, 1985. http://hdl.handle.net/10150/615596.
Full textPSL is developing a telemetry antenna intended to avoid the mechanical complexity of traditional parabolic passive monopulse trackers. For a considerable range of reception scenarios, a stationary non-tracking antenna will fill the reception requirement while greatly simplyfing the antenna hardware as compared to mechanical passive trackers. A single, phi-symmetric, shaped-beam antenna provides proper coverage of the test range for multiple airborne targets. This system is not time shared and requires no acquisition time. Approximate azimuth to the target is displayed on a CRT. This paper examines the applicable test scenario and the resulting hardware.
Robinson, Michael 1982. "Robust minimum variance beamforming with multiple response constraints." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=99791.
Full textThe manuscript also includes an overview of conventional beamforming, the mismatch problem and previously proposed robust beamformers.
Li, Zhan. "Antenna designs for handset applications multiple antennas integration and interaction with the human head /." Diss., Restricted to subscribing institutions, 2005. http://proquest.umi.com/pqdweb?did=920934001&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.
Full textBahceci, Israfil. "Multiple-Input Multiple-Output Wireless Systems: Coding, Distributed Detection and Antenna Selection." Diss., Available online, Georgia Institute of Technology, 2005, 2005. http://etd.gatech.edu/theses/available/etd-08262005-022321/.
Full textAltunbasak, Yucel, Committee Chair ; Mersereau, Russell M., Committee Member ; Fekri, Faramarz, Committee Member ; Smith, Glenn, Committee Member ; Huo, Xiaoming, Committee Member. Includes bibliographical references.
Murthy, Chandra Ramabhadra. "Channel estimation and feedback for multiple antenna communication." Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2006. http://wwwlib.umi.com/cr/ucsd/fullcit?p3220395.
Full textTitle from first page of PDF file (viewed September 5, 2006). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 158-164).
Miao, H. (Honglei). "Channel estimation and positioning for multiple antenna systems." Doctoral thesis, University of Oulu, 2007. http://urn.fi/urn:isbn:9789514284113.
Full textBala, Erdem. "Multichannel, multiuser and multiple antenna wireless communication systems." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 184 p, 2007. http://proquest.umi.com/pqdlink?did=1251904851&Fmt=7&clientId=79356&RQT=309&VName=PQD.
Full textBergeron-Burns, Philippe. "Reduced complexity decoding for multiple antenna wireless communications." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=82467.
Full textUsing Subspace Matched Filtering principles, two complexity reducing front-ends to any variant of the SD, are developed. These two-stage decoders are designed to only have marginally worse performance than SD.
Computer simulations confirm the lower complexity and close to ML performance of the two-stage decoders. For a two transmit and two receive antenna LD coded MIMO system at an SNR of 22dB, the two-stage decoder reduces the average size of the SD search tree by a factor of 5. The BER performance of the two-stage decoder is within 0.25dB of the ML performance.*
*This dissertation is a compound document (contains both a paper copy and a CD as part of the dissertation).
Ng, Kah Heng. "Advanced urban propagation modelling for multiple antenna systems." Thesis, University of Bristol, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.424638.
Full textGovindasamy, Siddhartan 1975. "Multiple-antenna systems in ad-hoc wireless networks." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/44410.
Full textIncludes bibliographical references (leaves 223-229).
The increasing demand for wireless communication services has resulted in crowding of the electromagnetic spectrum. The "spectral-commons" model, where a portion of the electromagnetic spectrum is public and used on an ad-hoc basis, has been proposed to free up spectrum that has been allocated but underutilized. Ad-hoc wireless networks (networks with no central control) are also interesting in their own right as they do not require costly infrastructure, are robust to single-node failures, and can be deployed in environments where it is difficult to deploy infrastructure. The main contributions of this thesis are expressions for the mean and in some cases the variance of the spectral efficiency (bits/second/Hz) of single-hop links in random wireless networks as a function of the number of antennas per node, link-length, interferer density, and path-loss-exponent (an environmental parameter that determines signal decay with distance), under assumptions chosen for realistic implementability in the near future. These results improve our understanding of such systems as they indicate the data rates achievable as a function of tangible parameters like user density and environmental characteristics, and are useful for designers of wireless networks to trade-off hardware costs, data-rates, and user densities. We found that constant mean spectral efficiencies can be maintained in wireless networks with increasing user density by linearly increasing the number of antenna elements per user, or by maintaining a constant fraction of nodes connected to high capacity infrastructure like optical fiber, equipped with antenna arrays. These are promising ways to serve an increasing density of users without increasing bandwidth. Additionally, several interesting features of such networks have been highlighted.
(cont.) For instance we found that the mean and variance of spectral efficiencies can be characterized in terms of a parameter called the link rank, which on average equals the number of interferers whose signal power is stronger at a representative receiver than its target transmitter. Rank thus combines the effects of node density and link lengths. Another interesting finding is that mean spectral efficiency in networks with rank-1 links, and equal numbers of antennas at transmit and receive sides can be improved if nodes turn off two thirds of their transmit antennas. These results were derived using infinite random matrix theory and validated using Monte Carlo simulations which were also used to characterize the distribution of spectral efficiencies in such networks.
by Siddhartan Govindasamy.
Ph.D.
Narula, Aradhana. "Information theoretic analysis of multiple-antenna transmission diversity." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/10453.
Full textIncludes bibliographical references (leaves 125-127).
by Aradhana Narula.
Ph.D.
Hansen, R. C. "A REVIEW OF MULTIPLE BEAM ANTENNA ARRAY TRADEOFFS." International Foundation for Telemetering, 1986. http://hdl.handle.net/10150/615352.
Full textTelemetry instrumentation antennas often require several beams to allow simultaneous tracking of several targets. These multiple beams can be provided several ways, including multiple beam antennas and phased arrays. A brief review of the tradeoffs involved in implementing multiple beams with phased arrays is given. Planar arrays, which may be combined to provide wide angular coverage, include a corporate feed giving multiple independent beams, a distributed configuration with independent beams, the Butler beamformer, and the Gent-Rotman beamformer. Conformal implementations include cylindrical and conical arrays, and the spherical dome lens.
Joudeh, Hamdi. "A rate-splitting approach to multiple-antenna broadcasting." Thesis, Imperial College London, 2016. http://hdl.handle.net/10044/1/43930.
Full textRafati, Hamid Reza. "A new receiver architecture for multiple-antenna systems." Diss., Restricted to subscribing institutions, 2006. http://proquest.umi.com/pqdweb?did=1276402851&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.
Full textRoh, June Chul. "Multiple-antenna communication systems with finite rate feedback /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2005. http://wwwlib.umi.com/cr/ucsd/fullcit?p3167845.
Full textRomero, Zurita Leonardo Nabil. "Optimising multiple antenna techniques for physical layer security." Thesis, University of Leeds, 2014. http://etheses.whiterose.ac.uk/7636/.
Full textCoon, Justin Porter. "Frequency-domain equalization of single-carrier transmissions in single-antenna and multiple-antenna systems." Thesis, University of Bristol, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.419133.
Full textGlenn, Dickins, and glenn dickins@dolby com. "Applications of Continuous Spatial Models in Multiple Antenna Signal Processing." The Australian National University. Research School of Information Sciences and Engineering, 2008. http://thesis.anu.edu.au./public/adt-ANU20080702.222814.
Full textChu, Min. "Phase-shifting techniques for wireless multiple-antenna transmitter applications /." Thesis, Connect to this title online; UW restricted, 2006. http://hdl.handle.net/1773/6002.
Full textKlenner, Peter [Verfasser]. "Multiple Antenna Doppler-Compensation for OFDM Systems / Peter Klenner." Aachen : Shaker, 2011. http://d-nb.info/1071529552/34.
Full textTao, Yuming. "Multiple-beam antenna array for millimeter-wave wireless communications." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0005/NQ39397.pdf.
Full textKhuon, Lunal. "Parallel integrated receivers for multiple antenna wireless LAN systems." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/38689.
Full textIncludes bibliographical references (p. 147-154).
This thesis focuses on the design of power- and area-efficient parallel integrated receivers for multiple antenna wireless LAN systems. These receivers are part of an indoor parallel radio system that achieves 1 gigabit per second data rates and enables high bandwidth wireless communication between portable user devices and a high speed wired internet connection. Since a critical aspect for efficiency is that an optimal number of transceivers be used to meet system requirements, this thesis first considers power dissipation and area. consumption for parallel integrated transceivers. It develops parallel transceiver power dissipation and area consumption models that are functions of distance, data rate, and noise figure and incorporate the behavior of a multiple-input, multiple-output channel and power dissipation and area consumption values for typical RF circuits. These models properly balance benefits of multiple antennas with drawbacks due to parallel radio overhead. Their application shows that the combined transceiver power dissipation can actually decrease with more antennas and also provides a circuits-based number of antennas upper bound that has not been established previously.
(cont.) The thesis then proposes a solution that applies multiple antenna signal-to-noise ratio (SNR) gain at the receiver to reduce its power dissipation and area consumption. SNR gain trades noise figure for power- and area-efficient circuits. The implementation of a, single chip 5.22-GHz area-efficient parallel receiver RFIC that shows practical application of these models, SNR gain, and area-efficient circuits is demonstrated. The context of this design comes from the Wireless Gigabit Local Area Network (WiGLAN). It's system characteristics such as a wide 150 MHz bandwidth and parallel radios uniquely determine a WiGLAN parallel receiver design.
by Lunal Khuon.
Ph.D.
Kwala, Pimpin Carleton University Dissertation Engineering Electrical. "Adaptive multiple-beam antenna arrays for indoor wireless communications." Ottawa, 1992.
Find full textLee, Heechoon. "On the design of reliable multiple antenna communication systems." Diss., Restricted to subscribing institutions, 2007. http://proquest.umi.com/pqdweb?did=1317343331&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.
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