Telecommunications Science ›› 2011, Vol. 27 ›› Issue (3): 71-77.doi: 10.3969/j.issn.1000-0801.2011.03.019

• research and development • Previous Articles     Next Articles

A Novel Diversity-Multiplexing Tradeoff Scheme in Cooperative MIMO Based on Distributed Space-Time Coding

Xiaorong Xu1,Jianwu Zhang1,Baoyu Zheng2   

  1. 1 College of Telecommunication Engineering,Hangzhou Dianzi University,Hangzhou 310018,China
    2 Institute of Signal Processing and Transmission,Nanjing University of Posts and Telecommunications,Nanjing 210003,China
  • Online:2011-03-15 Published:2011-03-15

Abstract:

Cooperative MIMO which is composed of multiple single antenna nodes by cooperative communication could construct multiple virtual transmit antennas. Spatial diversity gain could be obtained from this virtual MIMO multiple antenna arrays. Considered the specific features of cooperative MIMO,code cooperation strategy with distributed space-time coding is implemented in the network. An enhanced diversity-multiplexing tradeoff(DMT)scheme based on distributed space-time coding (DSTC)in cooperative MIMO is studied. The expression of outage probability and diversity gain of two DSTC strategies are derived in detail. Based on the two DMT schemes of DSTC,the optimal DMT and outage performance of the enhanced DMT strategy could be obtained through altering the threshold of multiplexing gain adaptively. Numerical results indicate that,the proposed DMT scheme could be asymptotical to DMT upper bound in cooperative MIMO,and the corresponding outage performance is also inferior to that of upper bound. Hence,cooperative diversity gain and optimum outage behavior could be achieved simultaneously by the proposed DMT scheme for DSTC code cooperation in multi-node cooperative MIMO scenario.

Key words: cooperative MIMO, distributed space-time coding, diversity-multiplexing tradeoff, outage performance

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