Results 291 to 300 of about 563,494 (333)

Cooperative Diversity with Partially Cooperative Relays

2009 5th International Conference on Wireless Communications, Networking and Mobile Computing, 2009
Wireless relays extend coverage, improve spectral efficiency, and enhance reliability and rates of wireless communication systems. In this work, we introduce a three-hop cooperative system model comparing to conventional dual-hop cooperative systems, assuming all terminals can only share a part of power for cooperation and have only one antenna for ...
Weihua Deng, Xiqi Gao
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Cooperator switch diversity in cooperative networks

PACRIM. 2005 IEEE Pacific Rim Conference on Communications, Computers and signal Processing, 2005., 2005
Cooperative diversity allows single-antenna terminals to explore uplink transmit diversity via antenna sharing. However, the achievable diversity gain is limited by the imperfect source-relay link. In this paper, we propose a cooperator switch diversity scheme to enhance the performance of cooperative networks.
null Le Yang, null Hong-Chuan Yang
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Joint cooperation diversity and symbol mapping diversity in cooperative communication systems

2007 International Conference on Communications, Circuits and Systems, 2007
In this paper, we investigate joint cooperation diversity and symbol mapping diversity strategies for cooperative communication systems that employ nonbinary linear modulations such as phase-shift keying (PSK) and quadrature amplitude modulation (QAM). Substantial symbol error rate gains results from designing different symbol mappings for each packet ...
Wei Ji, Bao-yu Zheng, null Cui Jing-wu
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Opportunistic Source/Destination Cooperation in Cooperative Diversity Networks

IEEE Transactions on Wireless Communications, 2010
In this paper, we combine opportunistic transmission and source/destination cooperation in a decode-and-forward (DF)-based two-hop cooperative diversity network consisting of multiple source-destination pairs and a single relay. Firstly, we consider a special scenario with two source-destination pairs.
Min-Chul Ju, Il-Min Kim 0001, Dong In Kim   +2 more
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Capacity bounds for Cooperative diversity

IEEE Transactions on Information Theory, 2006
In a cooperative diversity network, users cooperate to transmit each others' messages; to some extent nodes therefore collectively act as an antenna array and create a virtual or distributed multiple-input multiple-output (MIMO) system. In this paper, upper and lower bounds for the information-theoretic capacity of four-node ad hoc networks with two ...
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Diversity and multiplexing tradeoff bounds for cooperative diversity protocols

International Symposium onInformation Theory, 2004. ISIT 2004. Proceedings., 2004
We consider a wireless network with multiple terminals (m/spl ges/2) as well as multiple receive antennas at the destination (N/spl ges/1) and obtain diversity multiplexing tradeoff upper bounds for some recently proposed cooperative diversity protocols.
Narayan Prasad, Mahesh K. Varanasi
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An experimental framework for the evaluation of cooperative diversity

2009 43rd Annual Conference on Information Sciences and Systems, 2009
Cooperative diversity is the result of relaying among nodes to achieve space diversity in multipath environments that offer limited time and frequency diversity. Although there is now substantial literature covering specification and analysis of cooperative communication strategies based upon models of wireless environments, there is much less work ...
Glenn Bradford, J. Nicholas Laneman
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Multiple Source Cooperation Diversity

IEEE Communications Letters, 2004
We propose a new class of cooperative diversity schemes based on joint coding of the data of multiple wireless users. These schemes can achieve high diversity orders and high code rates.
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Wireless Network Coding with Cooperative Diversity

Wireless Personal Communications, 2010
In this paper we integrate the ideas of network coding and relays into an existing practical network architecture used in a wireless network scenario. Specifically, we use the COPE architecture to test our ideas. Since previous works have focused on the communication aspect at the physical layer level, we attempt to take it one step further by ...
Asnar, Anang Z., Magaña, Mario E., Felhauer, Tobias   +2 more
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Blind cooperative diversity with multiple relays

2008 3rd International Symposium on Wireless Pervasive Computing, 2008
Mobile users with single antennas can still take advantage of spatial diversity through cooperative space-time encoded transmission. In this paper, we consider a scheme in which a relay chooses to cooperate only if its source-relay channel is of an acceptable quality and we evaluate the usefulness of relaying when the source acts blindly and ignores ...
Kamel Tourki, Mohamed-Slim Alouini, Luc Deneire   +2 more
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