Results 211 to 220 of about 67,451 (260)
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On the SEP of Cooperative Diversity with Opportunistic Relaying
IEEE Communications Letters, 2008We analyze the exact symbol error probability (SEP) of cooperative diversity with opportunistic amplify-and-forward (AF) relaying. The benefit of this opportunism to the SEP is assessed by comparing with maximal ratio combining of orthogonal multiple AF relay transmissions.
Hien Quoc Ngo, Hyundong Shin
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On the diversity of cooperative systems
2004 IEEE International Conference on Acoustics, Speech, and Signal Processing, 2004The paper addresses some of the opportunities and the challenges that could arise in the design and analysis of multi-hop systems that utilize cooperation among several intermediate regenerative relays to provide reliable high-quality communication between a source and a destination.
Paul A. Anghel, Mostafa Kaveh
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Cooperative-Diversity Slotted ALOHA
Second International Conference on Quality of Service in Heterogeneous Wired/Wireless Networks (QSHINE'05), 2005We propose a cooperative-diversity technique for ad hoc networks based on the decode-and-forward relaying strategy. We develop a MAC protocol based on slotted ALOHA that allows neighbors of a transmitter to act as relays and forward a packet toward its final destination when the transmission to the intended recipient fails.
Wing-Hin Wong, John M. Shea, Tan F. Wong
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The role of diversity in the evolution of cooperation
Journal of Theoretical Biology, 2012Understanding the evolutionary mechanisms that promote and maintain cooperative behavior is recognized as a major theoretical problem where the intricacy increases with the complexity of the participating individuals. This is epitomized by the diverse nature of Human interactions, contexts, preferences and social structures.
Santos, Francisco +3 more
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Noncooperative Routing with Cooperative Diversity
2007 IEEE International Conference on Communications, 2007Routing in wireless networks confronts more diverse and more rapidly varying characteristics associated with wireless links. Several recent protocols have tried to exploit cooperative diversity to deal with these channel characteristics, but they suffer from large overhead costs due to the need for collaboration among candidate nodes of next hop.
Benjamin R. Hamilton, Xiaoli Ma
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Cooperative diversity with selfish users
2008 42nd Annual Conference on Information Sciences and Systems, 2008Cooperation is socially desirable when users obey the rules of cooperation. This is the case in networks controlled by a single entity, such as military networks. On the other hand, in commercial wireless networks wherein users may behave for selfish intentions, it may be difficult to achieve a socially efficient cooperation without a mechanism that ...
Sintayehu Dehnie, Nasir D. Memon
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Cooperative Diversity with Partially Cooperative Relays
2009 5th International Conference on Wireless Communications, Networking and Mobile Computing, 2009Wireless 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., 2005Cooperative 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, 2007In 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, 2010In 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 +2 more
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