一种中继选择与分布式空时码相结合方案  

A joint scheme of relay selection and space time code in wireless relay networks

作　　者：赵知劲[1,2] 杨进丽[1] 王海泉[1] 

机构地区：[1]杭州电子科技大学通信工程学院,浙江杭州310018 [2]中国电子科技集团第36研究所通信系统信息控制技术国家级重点实验室,浙江嘉兴314001

出　　处：《电路与系统学报》2011年第1期79-84,91,共7页Journal of Circuits and Systems

基　　金：国家自然科学基金资助(60872092;60972049);浙江省自然科学基金资助(Y1090846);中国教育部"留学回国人员科研启动基金"资助

摘　　要：针对一个发送端、接收端及每个中继都配置单根天线的无线中继网络,在假设中继不知道任何信道信息的条件下,为了提高系统性能,本文提出中继选择与分布式空时码相结合的方案。证明了选择2个中继与Alamouti正交空时码的结合方案成对错误概率的Chernoff上界要比对应的只选择2个中继参加协作不使用Alamouti正交空时码的情况低得多。仿真表明,在QAM调制下中继个数为6、误符号率低于10-3时,这种方案可获得大于10dB的信噪比增益。Under an assumption that each relay has no any channel information in a wireless relay network in which every transmitter, receiver and relay is equipped with a single antenna respectively, a scheme combining distributed space time code with the relay selection is proposed in order to improve the performance of the system in this paper. It is proved that the Chernoff bound of the pair-wise error probability （PEP） of this combination scheme is much lower than the scheme without applying Alamouti orthogonal space time code when two relays are selected. Moreover, when the signals transmitted are chosen from a QAM constellation and six relays in the network, the simulation result indicates that the gain of this scheme is more than lOdB at symbol error rate lower than 10^-3.

关 键 词：无线中继网络 中继选择 Alamouti正交空时码 成对错误概率 

分 类 号：TN925[电子电信—通信与信息系统]