Дисертації з теми "Multi Antenna Wireless System"
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Shekhar, Hemabh. "Multi-antenna physical layer models for wireless network design." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/22681.
Повний текст джерелаCommittee Chair: Ingram, Mary Ann; Committee Member: Andrew, Alfred; Committee Member: Copeland, John; Committee Member: Owen, Henry; Committee Member: Sivakumar, Raghupathy.
Jiang, Meilong. "Robust cross-layer scheduling design in multi-user multi-antenna wireless systems." Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B38346758.
Повний текст джерелаJiang, Meilong, and 江美龍. "Robust cross-layer scheduling design in multi-user multi-antenna wireless systems." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B38346758.
Повний текст джерелаPollock, Tony Steven. "On limits of multi-antenna wireless communications in spatially selective channels /." View thesis entry in Australian Digital Theses Program, 2003. http://thesis.anu.edu.au/public/adt-ANU20050418.143712/index.html.
Повний текст джерелаYanikömeroglu, Halim. "Multi-antenna systems and interconnection strategies for CDMA wireless access networks." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0007/NQ41536.pdf.
Повний текст джерелаElsabae, Ramadan G. M. "Optimization techniques for reliable data communication in multi-antenna wireless systems." Thesis, Loughborough University, 2018. https://dspace.lboro.ac.uk/2134/34613.
Повний текст джерелаPollock, Tony Steven, and tony pollock@nicta com au. "On Limits of Multi-Antenna Wireless Communications in Spatially Selective Channels." The Australian National University. Research School of Information Sciences and Engineering, 2003. http://thesis.anu.edu.au./public/adt-ANU20050418.143712.
Повний текст джерелаZhou, Xiangyun. "Transmission resource allocation in multi-antenna wireless communication systems with channel uncertainty." Phd thesis, Institute of Electrical and Electronics Engineers (IEEE), 2013. http://hdl.handle.net/1885/9828.
Повний текст джерелаSellathurai, Mathini. "Turbo-blast : a novel technique for multi-transmit and multi-receive wireless communications /." *McMaster only, 2001.
Знайти повний текст джерелаYeh, Ho-Hsin. "Developments of 60 GHz Antenna and Wireless Interconnect inside Multi-Chip Module for Parallel Processor System." Diss., The University of Arizona, 2013. http://hdl.handle.net/10150/272872.
Повний текст джерелаKassouf, Marthe. "Capacity and information rates for multiple antenna wireless systems with multi-dimensional modulation." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=97781.
Повний текст джерелаLes systemes a entree multiple et sortie multiple permettent d’augmenter le debit de transmission de donnees dans les reseaux de communication sans fil. Ces systemes sont caracterises par une grande flexibilite de conception, ce qui leur permet d’accommoder une grande variete de techniques de signalisation et d’attribution de ressources. Dans cette these, nous considerons la capacite et les debits de transmission possibles pour les systemes a entree multiple et sortie multiple utilisant une variete de formats de modulation espacetemps multidimensionnelle. Ces formats correspondent a differentes manieres d’ attribuer les dimensions orthogonales du signal aux antennes de transmission. Pour un systeme ayant un seul usager et moyennant une puissance de transmission fixe, nous examinons comment attribuer la puissance et les dimensions du signal aux antennes de transmission, de maniere a maximiser les debits de transmission en tenant compte de 1’information sur l’etat du canal dont dispose le transmetteur. Dans plusieurs situations, nous demontrons qu’utiliser toutes les dimensions du signal sur chaque antenne de transmission permet d’atteindre de plus hauts debits de transmission. [...]
Nagy, Amr. "Performance enhancement for filter bank multicarrier methods in multi-antenna wireless communication systems." Thesis, University of Strathclyde, 2018. http://digitool.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=30532.
Повний текст джерелаZhou, Lin. "Energy efficient transmitter design with compact antenna for future wireless communication systems." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/33104.
Повний текст джерелаNormando, Paulo Garcia. "Alinhamento de interferÃncia espacial em cenÃrios realistas." Universidade Federal do CearÃ, 2013. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=10874.
Повний текст джерелаDevido ao rÃpido crescimento e os agressivos requisitos de vazÃo nas atuais redes sem fio, como os sistemas celulares de 4 a GeraÃÃo, a interferÃncia se tornou um problema que nÃo pode mais ser negligenciado. Neste contexto, o Alinhamento de InterferÃncia (IA) tem surgido como uma tÃcnica promissora que possibilita transmissÃes livres de interferÃncia com elevada eficiÃncia espectral. No entanto, trabalhos recentes tÃm focado principalmente nos ganhos teÃricos que esta tÃcnica pode prover, enquanto esta dissertaÃÃo visa dar um passo na direÃÃo de esclarecer alguns dos problemas prÃticos de implementaÃÃo da tÃcnica em redes celulares, bem como comparÃ-la com outras tÃcnicas bem estabelecidas. Uma rede composta por trÃs cÃlulas foi escolhida como cenÃrio inicial de avaliaÃÃo, para o qual diversos fatores realistas foram considerados de modo a realizar diferentes anÃlises. A primeira anÃlise foi baseada em imperfeiÃÃes de canal, cujos resultados mostraram que o IA à mais robusto aos erros de estimaÃÃo de canal que o BD (do inglÃs, Block Diagonalization), enquanto as duas abordagens sÃo igualmente afetadas pela correlaÃÃo entre as antenas. O impacto de uma interferÃncia externa nÃo-coordenada, que foi modelada por diferentes matrizes de covariÃncia de modo a emular vÃrios cenÃrios, tambÃm foi avaliado. Os resultados mostraram que as modificaÃÃes feitas nos algoritmos de IA podem melhorar bastante seus desempenho, com uma vantagem para o algoritmo que suprime um Ãnico fluxo de dados, quando sÃo comparadas as taxas de erro de bit alcanÃadas por cada um. Para combinar os fatores das anÃlises anteriores, as variaÃÃes temporais de canal foram consideradas. Neste conjunto de simulaÃÃes, alÃm da presenÃa da interferÃncia externa, os prÃ-codificadores sÃo calculados atravÃs de medidas atrasadas de canal, levando a resultados que corroboraram com as anÃlises anteriores. Um fato recorrente percebido em todas as anÃlises anteriores à o dilema entre aplicar os algoritmos baseados em BD, para que se consiga alcanÃar maiores capacidades, ou enviar a informaÃÃo atravÃs de um enlace mais confiÃvel utilizando o IA. Uma maneira de esclarecer este dilema à efetivamente realizar simulaÃÃes a nÃvel sistÃmico, para isto foi aplicado um simulador sistÃmico composto por um grande nÃmero de setores. Como resultado, todas as anÃlises realizadas neste simulador mostraram que a tÃcnica de IA atinge desempenhos intermediÃrios entre a nÃo cooperaÃÃo e os algoritmos baseados na prÃ-codificaÃÃo conjunta. Uma das principais contribuiÃÃes deste trabalho foi mostrar alguns cenÃrios em que a tÃcnica do IA pode ser aplicada. Por exemplo, quando as estimaÃÃes dos canais nÃo sÃo tÃo confiÃveis à melhor aplicar o IA do que os esquemas baseados no processamento conjunto. TambÃm mostrou-se que as modificaÃÃes nos algoritmos de IA, que levam em consideraÃÃo a interferÃncia externa, podem melhorar consideravelmente o desempenho dos algoritmos. Finalmente, o IA se mostrou uma tÃcnica adequada para ser aplicada em cenÃrios em que a interferÃncia à alta e nÃo à possÃvel ter um alto grau de cooperaÃÃo entre os setores vizinhos.
Due to the rapid growth and the aggressive throughput requirements of current wireless networks, such as the 4th Generation (4G) cellular systems, the interference has become an issue that cannot be neglected anymore. In this context, the Interference Alignment (IA) arises as a promising technique that enables transmissions free of interference with high-spectral efficiency. However, while recent works have focused mainly on the theoretical gains that the technique could provide, this dissertation aims to go a step further and clarify some of the practical issues on the implementation of this technique in a cellular network, as well as compare it to other well-established techniques. As an initial evaluation scenario, a 3-cell network was considered, for which several realistic factors were taken into account in order to perform different analyses. The first analysis was based on channel imperfections, for which the results showed that IA is more robust than Block Diagonalization (BD) regarding the Channel State Information (CSI) errors, but both are similarly affected by the correlation among transmit antennas. The impact of uncoordinated interference was also evaluated, by modeling this interference with different covariance matrices in order to mimic several scenarios. The results showed that modifications on the IA algorithms can boost their performance, with an advantage to the approach that suppresses one stream, when the Bit Error Rate (BER) is compared. To combine both factors, the temporal channel variations were taken into account. At these set of simulations, besides the presence of an external interference, the precoders were calculated using a delayed CSI, leading to results that corroborate with the previous analyses. A recurring fact on the herein considered analyses was the dilemma of weather to apply the Joint Processing (JP)-based algorithms in order to achieve higher sum capacities or to send the information through a more reliable link by using IA. A reasonable step towards solving this dilemma is to actually perform the packet transmissions, which was accomplished by employing a system-level simulator composed by a large number of Transmission Points (TPs). As a result, all analyses conducted with this simulator showed that the IA technique can provide an intermediate performance between the non-cooperation and the full cooperation scheme. Concluding, one of the main contributions of this work has been to show some scenarios/cases where the IA technique can be applied. For instance, when the CSI is not reliable it can be better to use IA than a JP-based scheme. Also, the modifications on the algorithms to take into account the external interference can boost their performance. Finally, the IA technique finds itself in-between the conventional transmissions and Coordinated Multi-Point (CoMP). IA achieves an intermediate performance, while requiring a certain degree of cooperation among the neighboring sectors, but demanding less infrastructure than the JP-based schemes.
Gezer, Berat Levent. "Multi-beam digital antenna for radar, communications, and UAV tracking based on off-the-shelf wireless technologies." Thesis, Monterey California. Naval Postgraduate School, 2006. http://hdl.handle.net/10945/2583.
Повний текст джерелаFahmy, Nader S. Todd Terence D. "Ad hoc networks with power-controlled multi-antenna systems: MAC protocols and multihop relaying applications." *McMaster only, 2005.
Знайти повний текст джерелаCha, Jeongwon. "A CMOS radio-frequency front-end for multi-standard wireless communications." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37250.
Повний текст джерелаGerman, Gus R. "A ray-based investigation of the statistical characteristics and efficient representation of multi-antenna communication channels /." Diss., CLICK HERE for online access, 2004. http://contentdm.lib.byu.edu/ETD/image/etd491.pdf.
Повний текст джерелаSpencer, Quentin H. "Transmission Strategies for Wireless Multi-user, Multiple-Input, Multiple-Output Communication Channels." Diss., CLICK HERE for online access, 2004. http://contentdm.lib.byu.edu/ETD/image/etd378.pdf.
Повний текст джерелаDimitrov, Emil [Verfasser]. "System design and validation of multi-band OFDM wireless communications with multiple antennas / Emil Dimitrov." Hannover : Technische Informationsbibliothek und Universitätsbibliothek Hannover (TIB), 2013. http://d-nb.info/1036694151/34.
Повний текст джерелаLiu, Lingjia. "On delay-sensitive communication over wireless systems." [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-2725.
Повний текст джерелаSalah, Adham M. S. "Investigation of Integrated Decoupling Methods for MIMO Antenna Systems. Design, Modelling and Implementation of MIMO Antenna Systems for Different Spectrum Applications with High Port-to-Port Isolation Using Different Decoupling Techniques." Thesis, University of Bradford, 2019. http://hdl.handle.net/10454/18427.
Повний текст джерелаHigher Committee for Education Development in Iraq (HCED)
Diameh, Yousef A. "The optimization of multiple antenna broadband wireless communications. A study of propagation, space-time coding and spatial envelope correlation in Multiple Input, Multiple Output radio systems." Thesis, University of Bradford, 2013. http://hdl.handle.net/10454/6361.
Повний текст джерелаDia'meh, Yousef Ali. "The optimization of multiple antenna broadband wireless communications : a study of propagation, space-time coding and spatial envelope correlation in Multiple Input, Multiple Output radio systems." Thesis, University of Bradford, 2013. http://hdl.handle.net/10454/6361.
Повний текст джерелаPan, Zhengang, and 潘振崗. "Generalized beamforming for downlink of multi-user MIMO systems." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B29636139.
Повний текст джерелаNarayanaswamy, Sriram Kizhakkemadam. "Queuing delay of multi-antenna multi-user wireless networks." Ann Arbor, Mich. : ProQuest, 2008. 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:3303954.
Повний текст джерелаTitle from PDF title page (viewed Mar. 16, 2009). Source: Dissertation Abstracts International, Volume: 69-03, Section: B, page: 1842. Adviser: Dinesh Rajan. Includes bibliographical references.
Almeida, Andrà Lima FÃrrer de. "Modelagem tensorial e processamento de sinais por sistemas de comunicaÃÃes de redes." Universidade Federal do CearÃ, 2007. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=2131.
Повний текст джерелаEm diversas aplicaÃÃes do processamento de sinais em sistemas de comunicaÃÃo sem-fio, o sinal recebido à de natureza multidimensional, possuindo uma estrutura algÃbrica multilinear. Neste contexto, a decomposiÃÃo tensorial PARAFAC tem sido utilizada em vÃrios trabalhos ao longo dos Ãltimos seis anos. Observa-se, entretanto, que decomposiÃÃes tensoriais generalizadas sÃo necessÃrias para modelar uma classe mais ampla de sistemas de comunicaÃÃo, caracterizada pela presenÃa de estruturas de transmissÃo mais complexas, por modelos de canal mais realistas, e por tÃcnicas de processamento de sinais mais eficientes no receptor. Esta tese investiga novas abordagens tensorias e suas aplicaÃÃes em modelagem de sistemas MIMO, equalizaÃÃo, separaÃÃo de sinais e estimaÃÃo paramÃtrica de canal. Inicialmente, duas novas decomposiÃÃes tensoriais (PARAFAC em blocos com restriÃÃes e CONFAC) sÃo desenvolvidas e estudadas em termos de identificabilidade. Em uma segunda parte do trabalho, novas aplicaÃÃes destas decomposiÃÃes tensoriais sÃo propostas. A decomposiÃÃo PARAFAC em blocos com restriÃÃes à aplicada, primeiramente, Âa modelagem unificada de sistemassuperamostrados, DS-CDMA e OFDM, com aplicaÃÃo em equalizaÃÃo multiusuÃria. Em seguida, esta decomposiÃÃo à utilizada na modelagem de sistemas de transmissÃo MIMO com espalhamento espaÃo-temporal e detecÃÃo conjunta. Em seguida, a decomposiÃÃo CONFAC à explorada na concepÃÃo de uma nova arquitetura generalizada de transmissÃo MIMO/CDMA que combina diversidade e multiplexagem. As propriedades de unicidade desta decomposiÃÃo permitem o uso do processamento nÃo-supervisionado no receptor, visando a reconstruÃÃo dos sinais transmitidos e a estimaÃÃo do canal. Na terceira e Ãltima parte deste trabalho, explora-se a decomposiÃÃo PARAFAC no contexto de duas aplicaÃÃes diferentes. Na primeira, uma nova estrutura de transmissÃo espaÃo-temporal-freqÃencial à proposta para sistemas MIMO multiportadora. A segunda aplicaÃÃo consiste em um novo estimador paramÃtrico para canais multipercursos.
In several signal processing applications for wireless communications, the received signal is multidimensional in nature and may exhibit a multilinear algebraic structure. In this context, the PARAFAC tensor decomposition has been the subject of several works in the past six years. However, generalized tensor decompositions are necessary for covering a wider class of wireless communication systems with more complex transmission structures, more realistic channel models and more efficient receiver signal processing. This thesis investigates tensor modeling approaches for multiple-antenna systems, channel equalization, signal separation and parametric channel estimation. New tensor decompositions, namely, the block-constrained PARAFAC and CONFAC decompositions, are developed and studied in terms of identifiability. First, the block-constrained PARAFAC decomposition is applied for a uniÂed tensor modeling of oversampled, DS-CDMA and OFDM systems with application to blind multiuser equalization. This decomposition is also used for modeling multiple-antenna (MIMO) transmission systems with block space-time spreading and blind detection, which generalizes previous tensor-based MIMO transmission models. The CONFAC decomposition is then exploited for designing new MIMO-CDMA transmission schemes combining spatial diversity and multiplexing. Blind symbol/code/channel recovery is discussed from the uniqueness properties of this decomposition. This thesis also studies new applications of third-order PARAFAC decomposition. A new space-time-frequency spreading system is proposed for multicarrier multiple-access systems, where this decomposition is used as a joint spreading and multiplexing tool at the transmitter using tridimensional spreading code with trilinear structure. Finally, we present a PARAFAC modeling approach for the parametric estimation of SIMO and MIMO multipath wireless channels with time-varying structure.
Zainal, Abidin Intan. "Multi antenna multiplexing techniques in static wireless links." Thesis, University of Surrey, 2017. http://epubs.surrey.ac.uk/841785/.
Повний текст джерелаBanister, Brian Clarke. "Feedback assisted multi-antenna transmission weight adaptation for wireless communications /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2002. http://wwwlib.umi.com/cr/ucsd/fullcit?p3061640.
Повний текст джерелаHinton, Danielle A. (Danielle Ayodele) 1978. "Protocols for multi-antenna ad-hoc wireless networking in interference environments." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/62416.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (p. 231-242).
A fundamental question for the design of future wireless networks concerns the nature of spectrum management and the protocols that govern use of the spectrum. In the oligopoly model, spectrum is owned and centrally managed, and the protocols tend to reflect this centralized nature. In the common's model, spectrum is a public good, and protocols must support ad hoc communication. This work presents the design, tradeoffs and parameter optimization for a new protocol (Simultaneous Transmissions in Interference (STI-MAC)) for ad hoc wireless networks. The key idea behind the STI-MAC protocol is 'channel stuffing,' that is, allowing network nodes to more efficiently use spatial, time and frequency degrees of freedom. This is achieved in three key ways. First, 'channel stuffing' is achieved through multiple antennas that are used at the receiver to mitigate interference using Minimum-Mean-Squared-Error (MMSE) receivers, allowing network nodes to transmit simultaneously in interference limited environments. The protocol also supports the use of multiple transmit antennas to beamform to the target receiver. Secondly, 'channel stuffing' is achieved through the use of a control channel that is orthogonal in time to the data channel, where nodes contend in order to participate on the data channel. And thirdly, 'channel stuffing' is achieved through a protest scheme that prevents data channel overloading. The STI-MAC protocol is analyzed via Monte-Carlo simulations in which transmitter nodes are uniformly distributed in a plane, each at a fixed distance from their target receiver; and as a function of network parameters including the number of transmit and receive antennas, the distance between a transmitter-receiver pair (link-length), the average number of transmitters whose received signal is stronger at a given receiver than its target transmitter (link-rank), number of transmitter-receiver pairs, the distribution on the requested rate, the offered load, and the transmit scheme. The STI-MAC protocol is benchmarked relative to simulations of the 802.11(n) (Wi-Fi) protocol. The key results of this work show a 3X gain in throughput relative to 802.11(n) in typical multi-antenna wireless networks that have 20 transmitter-receiver pairs, a link-length of 10 meters, four receive antennas and a single transmit antenna. We also show a reduction in delay by a factor of two when the networks are heavily loaded. We find that the link-rank is a key parameter affecting STIMAC gains over Wi-Fi. In simulations of networks with 40 transmit-receiver pairs, link-rank of three, a link-length of 10 meters, and eight transmit and receive antennas in which the transmitter beamforms to its target receiver in its strongest target channel mode, we find gains in throughput of at least 5X over the 802.11(n) protocol.
by Danielle A. Hinton.
Ph.D.
Janapsatya, Januar. "Switched-beam smart antenna system for indoor wireless LAN /." [St. Lucia, Qld.], 2004. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe18419.pdf.
Повний текст джерелаLi, Ran. "A wireless clock distribution system using an external antenna." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0011385.
Повний текст джерелаGuerra, Leonard. "IEEE 802.11b wireless LAN sensor system and antenna design." [Tampa, Fla] : University of South Florida, 2006. http://purl.fcla.edu/usf/dc/et/SFE0001713.
Повний текст джерелаCarlsson, Erik. "Underwater Communications System with Focus on Antenna Design." Thesis, Linköpings universitet, Elektroniska Kretsar och System, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-121481.
Повний текст джерелаHeffernan, Travis Jade. "Metamaterial Enhanced Wireless Power Transmission System." DigitalCommons@CalPoly, 2013. https://digitalcommons.calpoly.edu/theses/1069.
Повний текст джерелаBan, K., M. Katayama, W. E. Stark, T. Yamazato, and A. Ogawa. "Convolutionally Coded DS/CDMA System using Multi-Antenna Transmission." IEEE, 1997. http://hdl.handle.net/2237/7785.
Повний текст джерелаMacedo, Aleandro Soares. "Antenna sector-time division multiple access system for indoor wireless communications." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0014/NQ35234.pdf.
Повний текст джерелаSubramanian, 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.
Повний текст джерелаKhan, B. (Bilal). "Adaptive vehicular antenna system for extended range cellular access." Master's thesis, University of Oulu, 2016. http://urn.fi/URN:NBN:fi:oulu-201606092485.
Повний текст джерелаKiran, T. "Coding For Multi-Antenna Wireless Systems And Wireless Relay Networks." Thesis, 2006. https://etd.iisc.ac.in/handle/2005/399.
Повний текст джерелаKiran, T. "Coding For Multi-Antenna Wireless Systems And Wireless Relay Networks." Thesis, 2006. http://hdl.handle.net/2005/399.
Повний текст джерелаHUANG, YUN-HAO, and 黃昀皓. "Designs of Multi-band Antenna Arrays for 5G Wireless Communication System." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/fuxp3s.
Повний текст джерелаBaraani, Dastjerdi Mahmood. "High-Performance Multi-Antenna Wireless for 5G and Beyond." Thesis, 2020. https://doi.org/10.7916/d8-4q2c-1y14.
Повний текст джерелаKhanafer, Ali. "Precoding and Resource Allocation for Multi-user Multi-antenna Broadband Wireless Systems." Thesis, 2010. http://hdl.handle.net/1807/25728.
Повний текст джерелаChen, Xin-Xiong, and 陳信雄. "Development of Multi-Antenna System Applicable to Wireless Local Area Network Base Station." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/21404125855817411631.
Повний текст джерела國立臺灣科技大學
電機工程系
103
This thesis focuses on the development of multi-antenna systems applicable to wireless local area network base stations. The thesis consists of two parts. The first part is a six-antenna system, which uses slot antenna and invert-F antenna as antenna elements. To achieve space diversity, antennas are miniaturized by adding lump elements. Moreover, by adjusting antenna orientations, it produces differences in polarization and hence improves the isolation between adjacent antennas. Though adding lump element may deteriorate antenna efficiency, the fabricated prototype still shows radiation efficiency between 65 to 71% and is acceptable for projected uses. To test the diversity performance, an effective diversity gain measured systemis used to verify the good performance of the fabricated prototype in antenna diversity. The second part is an eight-antenna system. Two kinds of slot antennas are used as element antennas. The overall antenna system has a low-profile. To enhance the isolation among antennas, meandered slot are used to reduce antenna sizes. The eight antennas are arranged in a symmetrical fashion. Through the implementation and measurements, the fabricated prototype shows good performance in diversity. The antenna is suitable for WLAN base stations.
Pollock, Tony Steven. "On Limits of Multi-Antenna Wireless Communications in Spatially Selective Channels." Phd thesis, 2003. http://hdl.handle.net/1885/47999.
Повний текст джерелаSu, Student :. Hsuan-Jui, and 蘇炫睿. "Multi-Functions Active Antenna System a Wireless Repeater for the Reception of Digital TV Signals." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/76951911969908585595.
Повний текст джерела元智大學
通訊工程學系
98
This main purpose of this article is to develop a wireless repeater for TV reception. It is desired to increase the signal quality and signal strength at a frequency band of 500-600MHz. This antenna is integrated into a multi-function smart antenna system that is designed for WiFi communication 2.4GHz. The design concept is to use a pair of antennas that are used as receiving and transmitting antennas. In order to properly integrate them with the smart antenna system, the TV antennas utilize the support structures of system as a receiving antenna, and add a new antenna to transmit the amplified signal back into the space. To provide a proper isolation between these two antennas, polarization diversity was used, where the vertical and horizontal polarizations were used for the receiving and transmitting antennas. Wire antenna types were used. A RF circuit aiming to amplify the signals was designed using existing RF components. Numerical simulation and experimental measurement were performed and presented to validate the current design. Promising results and permance enhancement were obtained.
Ho, Wen-Pin, and 何文彬. "Design of Multi-Band Antennas For Wireless Communication System." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/85334455254902181824.
Повний текст джерела逢甲大學
電機工程所
99
In this thesis, the designs of multiband antennas for wireless communication system are studied. Here, three different antennas structure for mobile application are investigated and discussed. A hybrid mobile device antenna with double-layer structure for multiband operation is initially proposed. It is able to cover the wireless applications such as GSM/DCS/DCS/UMTS/WLAN 2400. The main structure of this antenna is composed of two layers; the top layer of proposed antenna produces three resonance modes (at around 0.88, 0.97 and 1.18 GHz) with respect to three radiation strips. The bottom layer of proposed antenna produces three resonance modes (at around 1.38, 1.76 and 2.45 GHz) by embedding a T-shape open-ended slot into the rectangle radiation patch. The second proposed antenna is a compact size (15 mm × 40 mm) microstrip-fed printed planar inverted-F antenna (PIFA) for mobile applications. The main structure of this antenna is a simple double-folded PIFA with two wide open-ended radiating sections. By tuning the two wide open-ended radiating sections, optimum impedance matching and inclusion of UMTS band can be achieved. Compared to the previously proposed antenna, this antenna has the advantages such as planar structure, and additional operating band in the WLAN 5.2/5.8 and WiMAX. Finally, a coplanar printed antenna with inverted L-shape coupling feed is proposed. By using an inverted L-shape coupling feed and a meandered shorting strip, two wide operation bands are excited. Both the lower and upper operation band can cover LTE 700/GSM and DCS 1800/PCS 1900/UMTS/LTE 2300, respectively. To operate at LTE 2500 band, a technique of joining a parasitic stub around the feed point which excites a resonance mode at 2.72 GHz is introduced. This proposed antenna can be used as a multiband antenna operation for the application in fourth generation (4 G) wireless communication system. By comparing to the other wireless communication system, the 4G wireless system can provide faster transmission speed and more system capacity.
Paredes, Riano Javier Mauricio. "Low-complexity space-time coding for multi-antenna systems and wireless relay networks." Phd thesis, 2009. https://tuprints.ulb.tu-darmstadt.de/1421/1/thesis.pdf.
Повний текст джерелаHo, Jaunty Tsun Yue. "Frequency-time-space correlation and its applications in multi-antenna systems." Phd thesis, 2004. http://hdl.handle.net/1885/150755.
Повний текст джерела