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Dissertations / Theses on the topic 'Cooperative relay system'

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Published: 6 September 2023

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1

Eddaghel, Masoud. "Mitigating PAPR in cooperative wireless networks with frequency selective channels and relay selection." Thesis, Loughborough University, 2014. https://dspace.lboro.ac.uk/2134/16339.

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The focus of this thesis is peak-to-average power ratio (PAPR) reduction in cooperative wireless networks which exploit orthogonal frequency division multiplexing in transmission. To reduce the PAPR clipping is employed at the source node. The first contribution focuses upon an amplify-and-forward (AF) type network with four relay nodes which exploits distributed closed loop extended orthogonal space frequency block coding to improve end-to-end performance. Oversampling and filtering are used at the source node to reduce out-of-band interference and the iterative amplitude reconstruction decod
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2

Lanzarini, Matteo. "Distributed optimization methods for cooperative beamforming in satellite communications." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/23246/.

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This thesis analyzes various beamforming techniques and theories of space information networking (SIN), with the aim of merging and using them in real application. We propose then two algorithm to solve two different problem linked to satellites and beamforming. The first one show a cluster of satellites that performs collaborative beamforming to reach an Earth user, while reducing interference in secondary directions. Then we consider a problem for hybrid satellite-terrestrial relay networks (HSTRNs), where multiple geostationary satellites transmit signals to multiple Earth terminal, with th
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Çelebi, Mehmet Bahadır. "On the Improvement of the Capacity of the Heterogeneous Networks with Link-Level and System-Level Approaches." Scholar Commons, 2014. https://scholarcommons.usf.edu/etd/5353.

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Evolution of wireless services enabled the development of the advanced applications and shifted the paradigms of research in this field from voice to data centric. Such services are spreading like wildfire between users and hence, increasing the demand for large bandwidth. However, the frequency spectrum that is suitable for wireless mobile communications is already assigned to particular services from 400 MHz to several GHz. Also, allocating a large chunk of band continuously from the same part of the spectrum may not be possible due to spectral crowd. Therefore, meeting the demand for high d
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4

Wu, Victor Kai Yuen. "OFDM-based cooperative communications in a single path relay network and a multiple path relay network." Thesis, Available online, Georgia Institute of Technology, 2006, 2006. http://etd.gatech.edu/theses/available/etd-11092006-152421/.

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5

Danaee, Ahmad. "Precoder Design for Cooperative MIMO Relay Systems." University of Akron / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1372335578.

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6

Abadi, Tarla. "Design and performance analysis of cooperative relay systems." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/design-and-performance-analysis-of-cooperative-relay-systems(8edce5bc-1518-4df2-aa49-36bf5386036a).html.

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Cooperative relay systems have emerged as promising techniques to boost the performance of wireless systems. Recent studies have confirmed that interferences, co-channel interferences (CCIs) and self-interferences, have a huge impact on cooperative relay systems and can cause significant performance degradation. Two problems were observed in this research. Firstly, previous studies on performance analysis of Amplify-and-Forward (AF) relay systems in presence of CCIs have only focused on a specific interference channel model. However, in practical design scenarios, such an assumption is not a r
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Zhang, Shunqing. "Cooperative relay in the next generation wireless networks /." View abstract or full-text, 2009. http://library.ust.hk/cgi/db/thesis.pl?ECED%202009%20ZHANGS.

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8

Hesketh, Thomas John. "Detection and resource allocation algorithms for cooperative MIMO relay systems." Thesis, University of York, 2014. http://etheses.whiterose.ac.uk/6145/.

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Cooperative communications and multiple-input multiple-output (MIMO) communication systems are important topics in current research that will play key roles in the future of wireless networks and standards. In this thesis, the various challenges in accurately detecting and estimating data signals and allocating resources in the cooperative systems are investigated. Firstly, we propose a cross-layer design strategy that consists of a cooperative maximum likelihood (ML) detector operating in conjunction with link selection for a cooperative MIMO network. Two new link selection schemes are propos
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9

Duo, Bin. "Polar Coding Schemes for Cooperative Transmission Systems." Thesis, The University of Sydney, 2015. http://hdl.handle.net/2123/14619.

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: In this thesis, a serially-concatenated coding scheme with a polar code as the outer code and a low density generator matrix (LDGM) code as the inner code is firstly proposed. It is shown that that the proposed scheme provides a method to improve significantly the low convergence of polar codes and the high error floor of LDGM codes while keeping the advantages of both such as the low encoding and decoding complexity. The bit error rate results show that the proposed scheme by reasonable design have the potential to approach a performance close to the capacity limit and avoid error floor eff
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10

Li, Houmin Thomas Gwynedd A. "Geotextile antenna design for mobile phone cooperative communication relay node." Auburn, Ala., 2008. http://hdl.handle.net/10415/1498.

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11

Mallick, Shankhanaad. "Resource optimization in relay based cooperative wireless systems under channel uncertainty." Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/51485.

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Over the last decade, the demand for wireless resources has been rising exponentially with the increase of the number of new users and services. The primary objective of wireless communication research is finding solutions to meet this increasing demand with limited radio resources. Relay based cooperative systems greatly enhance the performance of resource-constrained wireless networks. By allowing cooperation via relays, it is possible to improve the transmission quality and energy efficiency and get similar benefits to those of multiple-input-multiple-output (MIMO) systems. However, the be
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12

Shi, Jia. "Cooperation and resource allocation in relay and multicarrier systems." Thesis, University of Southampton, 2015. https://eprints.soton.ac.uk/378927/.

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In modern wireless communications, various techniques have been developed in order to exploit the dynamics existing in wireless communications. Diversity has been recognized as one of the key techniques, which has the potential to significantly increase the capacity and reliability of wireless communication systems. Relay communication with possible cooperation among some nodes is capable of achieving spacial diversity by forming a virtual antenna array for receiving and/or transmission. Dynamic resource allocation is capable of taking the advantages of the timevarying characteristics of wirel
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13

Dai, Gao Yang. "A novel soft forwarding technique for cooperative communication /." View abstract or full-text, 2010. http://library.ust.hk/cgi/db/thesis.pl?ECED%202010%20DAI.

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14

Gu, Jiaqi. "Low-cost interference mitigation and relay processing for cooperative DS-CDMA systems." Thesis, University of York, 2016. http://etheses.whiterose.ac.uk/15577/.

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In wireless communications, propagation aspects such as fading, shadowing and path loss are the major constraints that seriously limit the overall performance of systems. Indeed, severe fading has a detrimental effect on the received signals and can lead to a degradation of the transmission of information and the reliability of the network. In this case, diversity techniques are introduced in order to mitigate fading. Among various kinds of diversity techniques, cooperative diversity with relaying nodes is a modern technique that has been widely considered in recent years as an effective tool
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15

Poulimeneas, Dimitrios. "Back-pressure-like mechanisms on relay selection policies for cooperative diversity systems." Thesis, KTH, Reglerteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-167794.

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The topic of the current thesis is the reduction of the average packet delay in two-hop wireless cooperative networks with buffer-aided relays. This type of networks is of particular interest since it constitutes the building block for extended networks with multiple hops and numerous relays. Back-pressure-like algorithms are developed for the HRS and max − link relay selection schemes. First, an algorithm is developed and applied for both the HRS and the max − link protocols. It reduces the average delay considerably, but, in the case of the max − link the diversity of the system is reduced r
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16

Oliveira, Pedro Marinho Ramos de. "PARATUCK-N semi-blind receivers for multi-hop cooperative MIMO relay systems." reponame:Repositório Institucional da UFC, 2017. http://www.repositorio.ufc.br/handle/riufc/27317.

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OLIVEIRA, P. M. R. PARATUCK-N semi-blind receivers for multi-hop cooperative MIMO relay systems. 2017. 51 f. Dissertação (Mestrado em Engenharia de Teleinformática)–Centro de Tecnologia, Universidade Federal do Ceará, Fortaleza, 2017.<br>Submitted by Renato Vasconcelos (ppgeti@ufc.br) on 2017-09-09T02:17:00Z No. of bitstreams: 1 2017_dis_pmroliveira.pdf: 1188957 bytes, checksum: 745420c86668fea09707dfcc7364adf8 (MD5)<br>Rejected by Marlene Sousa (mmarlene@ufc.br), reason: Prezado Pedro: Existe uma orientação para que normalizemos as dissertações e teses da UFC, em suas paginas pré-textuais e l
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17

Choi, Gi Wan. "Low-complexity and power-efficient wireless cooperative relay networks with enhanced reliability." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/47721.

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In recent years, global mobile data traffic has been increasing exponentially as mobile devices pervade our daily lives. To cope with the ever growing demands for higher data rates and seamless connectivity, one solution is to drastically increase the number of macro base stations in the conventional cellular architecture. However, this results in high deployment costs. Deploying low-power nodes such as relays that do not require a wired backhaul connection within a macrocell is one of cost-effective ways to extend high data rate coverage range. Relays are typically deployed to increase signal
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18

Arab, Loodaricheh Roya. "Resource allocation in wireless systems with relay-based cooperation and energy harvesting." Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/55917.

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Wireless communication networks are subject to exponential growth as a result of proliferation of smart phones, diverse wireless services and Internet of Things (IoT) applications. This extensive growth of wireless networks can significantly increase energy consumption, and escalating environmental pollution and energy costs have already created an urge for green communication. Therefore, we need to be proactive in designing environment friendly communication technologies and efficient resource allocation solutions, which will potentially drive the future generation of wireless communication.
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19

Jiang, Jing. "Virtual-MIMO systems with compress-and-forward cooperation." Thesis, University of Edinburgh, 2011. http://hdl.handle.net/1842/5785.

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Multiple-input multiple-output (MIMO) systems have recently emerged as one of the most significant wireless techniques, as they can greatly improve the channel capacity and link reliability of wireless communications. These benefits have encouraged extensive research on a virtual MIMO system where the transmitter has multiple antennas and each of the receivers has a single antenna. Single-antenna receivers can work together to form a virtual antenna array and reap some performance benefits of MIMO systems. The idea of receiver-side local cooperation is attractive for wireless networks since a
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20

Wang, Hongzheng. "Performance analysis of cooperative systems with spatial random relays and interfering nodes." Click to view the E-thesis via HKUTO, 2010. http://sunzi.lib.hku.hk/hkuto/record/B44205041.

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21

Alotaibi, Faisal T. "Distributed space-time block coding in cooperative relay networks with application in cognitive radio." Thesis, Loughborough University, 2012. https://dspace.lboro.ac.uk/2134/10965.

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Spatial diversity is an effective technique to combat the effects of severe fading in wireless environments. Recently, cooperative communications has emerged as an attractive communications paradigm that can introduce a new form of spatial diversity which is known as cooperative diversity, that can enhance system reliability without sacrificing the scarce bandwidth resource or consuming more transmit power. It enables single-antenna terminals in a wireless relay network to share their antennas to form a virtual antenna array on the basis of their distributed locations. As such, the same divers
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22

Azarian, Yazdi Kambiz. "Outage limited cooperative channels protocols and analysis /." Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1154740723.

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23

Advaita, Advaita, and Mani Meghala Gali. "Performance Analysis of a MIMO Cognitive Cooperative Radio Network with Multiple AF Relays." Thesis, Blekinge Tekniska Högskola, Institutionen för tillämpad signalbehandling, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-13643.

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With the rapid growth of wireless communications, the demand for the various multimedia services is increasing day by day leading to a deficit in the frequency spectrum resources. To overcome this problem, the concept of cognitive radio technology has been proposed which allows the unlicensed secondary user (SU) to access the licensed spectrum of the primary user (PU), thus improving the spectrum utilization. Cooperative communications is another emerging technology which is capable of overcoming many limitations in wireless systems by increasing reliability and coverage. The transmit and rece
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24

Basharati, Sarhad. "MIMO and Relay Systems Based on Multi-Amplitude Minimum Shift Keying." Thesis, University of Canterbury. Electrical and Computer Engineering, 2013. http://hdl.handle.net/10092/8491.

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This thesis describes the use of a multi-amplitude minimum shift keying (MAMSK) signal in various types of wireless communication system. A MAMSK signal is a bandwidth efficient modulation scheme obtained by superimposing ℳ minimum shift keying (MSK) signals with unequal amplitudes. The overall phase of a MAMSK signal is controlled by the phase of the largest component MSK signal which allows the use of a low-complexity differential detector. A closed form expression for the average bit error rate (BER) for coherent detection of an MAMSK in AWGN is derived and is shown to achieve the same BER
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25

Sousa, Igor FlÃvio SimÃes de. "Distributed processing in receivers based on tensor for cooperative communications systems." Universidade Federal do CearÃ, 2014. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=12792.

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CoordenaÃÃo de AperfeÃoamento de Pessoal de NÃvel Superior<br>Ericsson Brasil<br>In this dissertation, we present a distributed data estimation and detection approach for the uplink of a network that uses CDMA at transmitters (users). The analyzed network can be represented by an undirected and connected graph, where the nodes use a distributed estimation algorithm based on consensus averaging to perform joint channel and symbol estimation using a receiver based on tensor signal processing. The centralized receiver, developed for a central base station, and the distributed receiver, developed
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26

Timilsina, Santosh. "Physical Layer Security in Training-Based Single-Hop/Dual-Hop Massive MIMO Systems." OpenSIUC, 2018. https://opensiuc.lib.siu.edu/theses/2376.

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The broadcast nature of wireless medium has made information security as one of the most important and critical issues in wireless systems. Physical layer security, which is based on information-theoretic secrecy concepts, can be used to secure the wireless channels by exploiting the noisiness and imperfections of the channels. Massive multiple-input multiple-output (MIMO) systems, which are equipped with very large antenna arrays at the base stations, have a great potential to boost the physical layer security by generating the artificial noise (AN) with the exploitation of excess degrees-of-
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27

Peron, Guilherme de Santi. "Esquemas de comunicação cooperativa com múltiplos relays e múltiplas antenas visando a eficiência energética." Universidade Tecnológica Federal do Paraná, 2016. http://repositorio.utfpr.edu.br/jspui/handle/1/2600.

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Redes de sensores sem fio geralmente são compostas por dispositivos que demandam qualidade de transmissão, porém com energia limitada. Desta condição, surge a necessidade do estudo da eficiência energética. Neste documento são apresentadas e comparadas algumas técnicas para melhorar a eficiência energética que englobam o uso da diversidade, tais como o uso de múltiplas antenas no transmissor e receptor bem como o uso de comunicação cooperativa, esta última melhor aproveitada quando um canal de retorno está disponível. São abordados dois modelos de comunicação. No primeiro cenário, apenas a cam
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28

Abaza, Mohamed. "Cooperative MIMO techniques for outdoor optical wireless communication systems." Thesis, Brest, 2015. http://www.theses.fr/2015BRES0073/document.

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Au cours de la dernière décennie, les communications optiques en espace libre (FSO) ont pris de l’ampleur dans les deux domaines académiques et industriels. L’importance de FSO s’appuie sur la possibilité de faire un système de transmission économique et écologique avec un débit élevé et sans licence à l’opposition des systèmes de transmission radiofréquences (RF). Dans la plupart des travaux antécédents sur les systèmes multi-émetteurs, seulement les canaux décorrélés ont été considérés. Un canal décorrélé nécessite un espace suffisant entre les émetteurs. Cette condition devient difficile et
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Peron, Guilherme de Santi. "Método distribuído multiobjetivo de seleção de relays em redes cooperativas sem fio utilizando lógica fuzzy." Universidade Tecnológica Federal do Paraná, 2012. http://repositorio.utfpr.edu.br/jspui/handle/1/326.

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Esta dissertação de mestrado apresenta um novo algoritmo de seleção de relays utilizando lógica fuzzy. O algoritmo proposto é distribuído, ao ser processado independentemente em cada nó dispensando a necessidade de uma entidade central, e multiobjetivo, visto que ele busca maximizar tanto o tempo de vida da rede como a vazão fim-a-fim. O novo método leva em conta o estado do canal instantâneo do canal relay-destino e a energia residual da bateria do nó. Como resultado, o algoritmo atribui um grau de relevância a cada candidato a relay, de forma que o nó com maior relevância é escolhido para re
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30

Li, Kwan-leung, and 李君樑. "The European currency crisis: a replay of strains on bretton woods system." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1995. http://hub.hku.hk/bib/B31954522.

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31

Tödtling, Franz, Patrick Lehner, and Alexander Kaufmann. "Do different types of innovation rely on specific kinds of knowledge interactions?" Institut für Regional- und Umweltwirtschaft, WU Vienna University of Economics and Business, 2008. http://epub.wu.ac.at/306/1/document.pdf.

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It is commonly accepted nowadays that innovations are brought forward in an interactive process of knowledge generation and application. The business sector, the science sector, and policy actors are involved in this process as has been stressed in concepts such as innovation systems and the network approach. It is still unclear, however, as to what extent different kinds of innovation rely on specific knowledge sources and links. More advanced innovations on the one hand might draw more on scientific knowledge, generated in universities and research organizations. Such knowledge is often exch
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32

Syed, Tamseel Mahmood. "Precoder Design Based on Mutual Information for Non-orthogonal Amplify and Forward Wireless Relay Networks." University of Akron / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1392043776.

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33

Souza, Alvaro Ricieri Castro e. "Eficiência energética e espectral em sistemas de comunicação sem fio: diversidade cooperativa, espacial e em frequência." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/3/3142/tde-27082018-091746/.

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Sistemas modernos de comunicação móvel sem fio, como os de quarta geração (4G), têm como principais metas prover elevada capacidade e alta qualidade de serviço (QoS) para os usuários. Para prover tal aumento de capacidade e QoS, sistemas 4G empregam diversas técnicas avançadas de transmissão e maior largura de banda, combinados com algoritmos de alocação de recursos que possam explorar de maneira eficiente tais técnicas, como por exemplo aproveitando as dimensões de diversidade do sistema. Em geral, porém, é necessário também aumentar a potência de transmissão para se atingir o ganho de capaci
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34

Jayasinghe, L. K. (Laddu Keeth Saliya). "Analysis on MIMO relaying scenarios in wireless communication systems." Doctoral thesis, Oulun yliopisto, 2015. http://urn.fi/urn:isbn:9789526207391.

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Abstract The thesis concentrates on evaluating and improving performances of various multiple-input multiple-output (MIMO) relaying scenarios that are particularly relevant to future wireless systems. A greater emphasis is placed on important practical situations, considering relay deployments, availability of channel state information (CSI), limitations of spectrum, and information secrecy. Initially, the performance of a non-coherent amplify-and-forward (AF) MIMO relaying is analyzed when the relay is deployed with the relay-to-destination channel having a line-of-sight (LoS) path. The main
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35

Cardone, Martina. "Techniques de coopération appliquées aux futurs réseaux cellulaires." Thesis, Paris, ENST, 2015. http://www.theses.fr/2015ENST0020/document.

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Une qualité de service uniforme pour les utilisateurs mobiles et une utilisation distribuée du spectre représentent les ingrédients clés des réseaux cellulaires de prochaine génération. Dans ce but, la coopération au niveau de la couche physique entre les nœuds de l’infrastructure et les nœuds du réseau sans fil a émergé comme une technique à fort potentiel. La coopération s’appuie sur les propriétés de diffusion du canal sans fil, c’est-à-dire que la même transmission peut être entendue par plusieurs nœuds, ouvrant ainsi la possibilité pour les nœuds de s’aider à transmettre les messages à le
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36

Liu, Lingfeng. "Cooperative wireless channel characterization and modeling: application to body area and cellular networks." Doctoral thesis, Universite Libre de Bruxelles, 2012. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209722.

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Cooperative wireless communication is an attractive technique to explore the spatial channel resources by coordination across multiple links, which can greatly improve the communication performance over single links. In this dissertation, we study the cooperative multi-link channel properties by geometric approaches in body area networks (BANs) and cellular networks respectively.<p><p>In the part of BANs, the dynamic narrowband on-body channels under body motions are modeled statistically on their temporal and spatial fading based on anechoic and indoor measurements. Common body scattering is
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Ghandour-Haidar, Soukayna. "Estimation de canal à évanouissements plats dans les transmissions sans fils à relais multibonds." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENT102.

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Cette thèse traite de l'estimation d'un canal de communication radio-mobile multi-bond. La communication entre l'émetteur et le récepteur est ainsi faite par l'intermédiaire de relais (de type « Amplify and-Forward ») en série. Les différents éléments (émetteurs, relais, récepteurs) peuvent être fixes ou mobiles. Chaque lien de communication (chaque bond) est modélisé par un canal de Rayleigh à évanouissements plats, avec un spectre Doppler issu de deux environnements possibles de diffusion : en deux dimensions (2D, amenant le spectre en U de Jakes), ou en trois dimensions (3D, amenant un spec
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Ronchini, Ximenes Leandro. "Approches tensorielles pour les systèmes de communication MIMO avec relais." Thesis, Nice, 2015. http://www.theses.fr/2015NICE4009/document.

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Dans les communications coopératives, deux ou plusieurs terminaux de transmissionsont combinés pour accroître la diversité et/ou la puissance des signaux arrivant à un récepteur. Récemment, l'analyse tensorielle s'est avérée une approche efficace pour l'estimation de canaux dans les systèmes coopératifs. Cependant, parmi les quelques travaux consacrés à cette tâche, l'utilisation de la décomposition tensorielle PARAFAC pour modéliser les signaux reçus ne permet pas l'estimation conjointe des symboles et des canaux de communication. Afin d'éviter l'utilisation de séquences de symboles pilotes,
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Liu, Chih-Sheng, and 劉稚聖. "Study in relay ordering in wireless cooperative communication system." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/68511788036471983930.

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碩士<br>國立中興大學<br>通訊工程研究所<br>102<br>In this paper,we first propose Algorithm of relay ordering for a wireless multihop cooperative diversity network. This Algorithm of relay ordering reduce the relay used than present research. Furthermore, for reduce the relay used more another step. We second propose another Algorithm of relay ordering in a different relay selection mechanism. Indeed the second Algorithm of relay ordering reduce more relay used than the first Algorithm. In the other hand we third propose two-stage stable matching algorithm of relay ordering which base on the stable matching fr
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40

Lu, Yuan-Kang, and 呂元剛. "An Improved OFDM-Based Cooperative Relay System Using Conjugate Transmission." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/34030917853309827769.

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碩士<br>國立清華大學<br>通訊工程研究所<br>101<br>In this thesis, we investigate intercarrier interference (ICI) cancellation for OFDM-based cooperative relay systems using conjugate transmission. First, we modify an existing adaptive receiver for such systems by introducing a new amplitude scaling factor for each subcarrier. The presented amplitude scaling factor is optimized by a carrier-to-interference-plus-noise ratio (CINR) criterion derived under multipath environments, rather than by the carrier-to-interference ratio (CIR) derived under AWGN channels in a previous scheme. With the proposed adaptive rec
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Chiu, Han-Chiuan, and 邱翰銓. "Precoding Design in Two-Way Cooperative System with Energy Harvesting Relay." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/64785606245180005933.

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碩士<br>國立中山大學<br>電機工程學系研究所<br>102<br>Due to rapid development of mobile communications, radio-frequency signals are surrounded in our environment. Besides conveying information, the ambient radio-frequency signal has gradually been utilized for energy harvesting. Radio Frequency energy harvesting begins from the fact that people gradually rely on mobile applications, such as communication apps., picturing software, and games, in their daily life. However, these applications are energy consuming. Although these devices can be charged through portable power bank, the energy stored in the power ba
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42

Chopra, Khyati. "Secrecy performance analysis of threshold-based cognitive and cooperative relay system with diversity reception." Thesis, 2018. http://eprint.iitd.ac.in:80//handle/2074/7936.

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Yeh, Tzu-Ming, and 葉子鳴. "Relay Selection in the Cooperative Communication System Based on the Maximum Security Capacity." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/448vnn.

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碩士<br>臺北市立大學<br>資訊科學系碩士在職專班<br>107<br>In the wireless communication development of nowadays, the need for information communicating medias is also elevated by prosperity of multi-media internet. The created wireless bandwidth demand is rapidly growing with various applications, and cooperative communication could support to improve wireless communication system efficiency through Spatial Diversity. In the wireless communication system based on the cooperative communication, all nodes can take different roles simultaneously as node for sending, node for relay, and receive destination. Through m
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44

Bansal, Gaurav. "Cooperative Communication In Store And Forward Wireless Networks Using Rateless Codes." Thesis, 2010. https://etd.iisc.ac.in/handle/2005/2225.

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In this thesis, we consider a cooperative relay-assisted communication system that uses rateless codes. When multiple relays are present, the relay with the highest channel gain to the source is the first to successfully decode a message from the source and forward it to the destination. Thus, the unique properties of rateless codes ensure that both rate adaptation and relay selection occur without the transmitting source or relays acquiring instantaneous channel knowledge. We show that in such cooperative systems, buffering messages at relays significantly increases throughput. We develop a n
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45

Bansal, Gaurav. "Cooperative Communication In Store And Forward Wireless Networks Using Rateless Codes." Thesis, 2010. http://etd.iisc.ernet.in/handle/2005/2225.

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Abstract:
In this thesis, we consider a cooperative relay-assisted communication system that uses rateless codes. When multiple relays are present, the relay with the highest channel gain to the source is the first to successfully decode a message from the source and forward it to the destination. Thus, the unique properties of rateless codes ensure that both rate adaptation and relay selection occur without the transmitting source or relays acquiring instantaneous channel knowledge. We show that in such cooperative systems, buffering messages at relays significantly increases throughput. We develop a n
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46

MEHRPOUYAN, HANI. "Estimation and Effects of Imperfect System Parameters on the Performance of Multi-Relay Cooperative Communications Systems." Thesis, 2010. http://hdl.handle.net/1974/7475.

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To date the majority of research in the area of cooperative communications focuses on maximizing throughput and reliability while assuming perfect channel state information (CSI) and synchronization. This thesis, seeks to address performance enhancement and system parameter estimation in cooperative networks while relaxing these idealized assumptions. In Chapter 3 the thesis mainly focuses on training-based channel estimation in multi-relay cooperative networks. Channel estimators that are capable of determining the overall channel gains from source to destination antennas are derived. Next,
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47

Chen, Moyuan. "Single and multiple user pair cooperation schemes with delay issues." Thesis, 2011. http://hdl.handle.net/1828/3530.

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Cooperative communication is a promising technique to provide spatial diversity in a virtual multi-input and multi-output (MIMO) manner. However, as application evolves toward a more practical situation, realistic constraints and issues such as channel state information (CSI) assumption must be accounted when developing appropriate cooperative schemes. In this thesis, we have addressed delay related problems in both single user pair cooperation (SUPC) and multiple user pair cooperation (MUPC) networks. In SUPC, realizing that the outdated CSI caused by delay between relay selection instant and
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48

Lai, Chih-Ming, and 賴志銘. "The Relay Selection of Dynamic Decode and Forward Protocol With Cooperative Network Coding System." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/16967657124059417896.

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碩士<br>國立中正大學<br>通訊工程研究所<br>101<br>Cooperative communication is a very popular research area, and it plays an important role in the new generations of wireless communications. Network coding technology combines several messages, and transmit the mixed messages into next receiver for providing higher transmitting throughput and performance. This thesis builds a wireless communication system combined with dynamic decode and forward (DDF) and network coding technology. We consider the situation when the system has multiple relays, how to select a proper relay? We research outage probability of thi
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49

Bharadwaj, Sachin. "Analysis and Optimization of Cooperative Amplify-and-Forward Relaying with Imperfect Channel Estimates." Thesis, 2013. http://etd.iisc.ac.in/handle/2005/3279.

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Relay-based cooperation promises significant gains in a wireless network as it provides an inde-pendent path between a source and a destination. Using simple single antenna nodes, it exploits the spatial diversity provided by the geographically separated nodes in a network to improve the robustness of the communication system against fading. Among the cooperative commu¬nication schemes, the amplify-and-forward (AF) relaying scheme is considered to be easy to implement since the relay does not need to decode its received signal. Instead, it just forwards to the destination the signal it receive
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50

Bharadwaj, Sachin. "Analysis and Optimization of Cooperative Amplify-and-Forward Relaying with Imperfect Channel Estimates." Thesis, 2013. http://hdl.handle.net/2005/3279.

Full text
Abstract:
Relay-based cooperation promises significant gains in a wireless network as it provides an inde-pendent path between a source and a destination. Using simple single antenna nodes, it exploits the spatial diversity provided by the geographically separated nodes in a network to improve the robustness of the communication system against fading. Among the cooperative commu¬nication schemes, the amplify-and-forward (AF) relaying scheme is considered to be easy to implement since the relay does not need to decode its received signal. Instead, it just forwards to the destination the signal it receive
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