无线网络中的一种异步差分空时协作方案  

Asynchronous differential space-time cooperative communications in wireless networks

作　　者：季彦呈[1] 高洋[1] 葛建华[1] 

机构地区：[1]西安电子科技大学综合业务网理论及关键技术国家重点实验室,陕西西安710071

出　　处：《西安电子科技大学学报》2009年第1期74-79,共6页Journal of Xidian University

基　　金：国家"863"计划资助(2006AA01Z270);广东省-国家自然基金委联合基金资助(U0635003);陕西省自然科学基金项目资助(2007F07)

摘　　要：为了去除协作用户间异步发送所产生的影响,降低接收端的系统复杂度,提出了一种在异步情况下仍可以实现差分空时协作的方案.将BPSK的信息符号分成两部分,分别在I路和Q路上进行差分调制,再进行TR-STBC的编码,接收端对信号进行类似差分STBC的译码,译码的I,Q两路分别是互不重叠的两部分信号,从而去除了异步所产生的干扰.误码率分析和系统仿真结果表明,该方案在异步情况下仍可获得协作的分集增益.In order to mitigate the effect of asynchronism between users and reduce the complexity of the receiver, an asynchronous differential space-time cooperation scheme is presented. Binary phase-shift keying （BPSK） information symbols are divided into two parts and differential-modulated on the in-phase axis （I axis） and quadrature-phase axis （Q axis） respectively, and then coded with the time-reversal space-time block code （TR-STBC）. The receiver decodes the signal with the similar method of differential space-time block code （DSTBC）, and the decoded signals on the I axis and Q axis are two separate parts of the transmit signal without the asynchronous effect. Through the analysis and simulation of the BER, we demonstrate that the scheme can still achieve cooperative diversity in an asynchronous condition.

关 键 词：协作分集 选择中继协议 差分空时分组码 时间反转空时分组码 

分 类 号：TN929.5[电子电信—通信与信息系统] TP393[电子电信—信息与通信工程]