吉林大学学报(工学版) ›› 2014, Vol. 44 ›› Issue (6): 1818-1824.doi: 10.13229/j.cnki.jdxbgxb201406043

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Opportunistic relay selection algorithm for AF-MIMO system

CHEN Jian, LI Jia-long, KUO Yong-hong   

  1. School of Telecommunications Engineering, Xidian University, Xi'an 710071, China
  • Received:2013-04-09 Online:2014-11-01 Published:2014-11-01

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Abstract: Under the condition that transmission power and relay power of the nodes are unknown, an opportunistic relay selection algorithm is proposed to solve the problem of best relay selection in AF-MIMO cooperative communication system without direction link. By theoretical analysis and mathematical derivation, the effects of the number of cooperative relays and the power allocation in each part of the system on the channel capacity are investigated. A simple criterion is derived using the instantaneous channel state information and the best relay is selected in terms of the maximin criterion, which improves the overall channel capacity without increasing the computation complexity. Simulation results show that, the relays selected using the proposed algorithm can significantly improve the channel capacity, ahich confirms the effectiveness of the proposed algorithm.

Key words: communication, opportunistic relay selection, channel capacity, instantaneous channel state information, cooperative communication

CLC Number: 

  • TN929.5
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