一种基于多中继选择的分布式空时分组编码方案

协作分集可以抵抗无线信道的多径衰落，结合空时分组编码可以更加有效地提高系统性能。传统的空时编码协作通信是选择所有正确译码的Relay进行协作转发，当Relay个数大于空时编码矩阵天线数时，系统无法获得额外增益，同时将消耗大量能量。给出了一种多中继选择方案(MOR)，提出了一种基于MOR终端选择的分布式空时分组编码协作方案。在给定STBC编码矩阵条件下，依据信道状况信息选择多个合适的中继终端参与分布式空时分组编码协作通信。新的协作方案通过简单的协议可获得传统方案的分集复用折中，同时节省系统能量。仿真结果表明，新的协作方案具有良好的分集复用性能并验证了其有效性。

A distributed space time block coding scheme based on multi relay selection

Cooperative diversity techniques have been adopted as an efficient way to mitigate multipath fading in wireless environments, and the performance will become more efficient when combining with space-time block coding. The traditional space-time cooperative communication chooses all the relays which could decode correctly, but it can't achieve the additional benefit when cooperative nodes more than the column of space-time matrix. In this paper, the multi-opportunistic relaying (M-OR) strategy was proposed to select multi relays. Then, the cooperative diversity of the distributed space time block coding (DSTBC) was developed based on M-OR. Under the given STBC coding matrix, many appropriate terminals were selected to participate in the cooperative communication of distributed space time block coding according to the state of channels. The new scheme can obtain the diversity-multiplexing tradeoff of traditional scheme by simple protocol and save the system energy. Simulation result validates the good performance and availability of the new cooperative scheme.