基于分布式中继选择的自适应协作传输方案  

Adaptive Cooperative Transmission Scheme Based on Distributed Relay Selection

作　　者：邹玉龙[1] 郑宝玉[1] 

机构地区：[1]南京邮电大学信号处理与传输研究院,江苏南京210003

出　　处：《电子学报》2009年第1期13-20,共8页Acta Electronica Sinica

基　　金：江苏省自然科学基金重点项目(No.BK2007729);江苏省高校自然科学重大基础研究项目(No.06KJA51001);江苏省博士研究生科研创新计划(No.CX08B-080Z);南京邮电大学攀登计划(No.NY207061);华为高校科技基金(No.YJCB2008039WL)

摘　　要：协作分集通过使网络用户共享彼此天线以形成虚拟多天线阵列,可以显著提高网络容量,然而针对网络拓扑的动态变化与无线传输的时变特性,仅靠协作分集并不能十分有效地解决这些问题,必须结合考虑相应的自适应传输策略.本文提出动态网络环境中协作中继的最佳选择准则,在此基础上给出最佳协作中继的分布式选择协议.根据协作中继与源节点间的无线信道质量,进一步提出一种自适应协作传输方案,以有效抵抗多用户网络环境中的无线衰落.此外,对自适应协作传输方案的误码性能,在瑞利衰落信道下进行相应的理论分析,得到了系统误比特率的解析表达式,据此给出数值仿真实验以进行性能比较.结果表明:相对于传统协作分集而言,本文提出的自适应协作传输方案获得了进一步的性能增益,误比特率显著下降.Cooperative diversity could form the virtual multiple antenna array and enlarge the network capacity enormously by sharing the different network users＇ antennas. However, only adoption of cooperative diversity can not combat the dynamic variation of network topology and the multipath fading of wireless transmission, for which we should employ both the cooperative diversity and the corresponding adaptive transmission strategy. Accordingly, the optimal criteria to select the cooperative relay among all the candidates is proposed in this paper, based on which a distributed relay selection protocol is presented. An adaptive cooperative transmission scheme is further proposed in accordance with the channle quality between cooperative relay and source node. Besides, closed-form expressions of BER （bit error ratio） for the proposed adaptive cooperation scheme is presented over Rayleigh fading channels. Then, numerical simulations are conducted to compare our scheme with the traditional cooperative diversity, showing the merits of the proposed adaptive cooperative diversity in terms of BER.

关 键 词：协作分集 自适应协作 最佳协作中继 误比特率 

分 类 号：TN929[电子电信—通信与信息系统]