全双工协作通信系统中分布式Alamouti空时编码的性能分析  

Performance analysis of distributed Alamouti space-time codes in full-duplex cooperative communication system

作　　者：冯文江[1] 刘国岭[1] 钟昕辉 姚楚楠 张博为[1] 代才莉[1,2] 

机构地区：[1]重庆大学通信工程学院,重庆400044 [2]重庆电子工程职业学院通信工程学院,重庆401331

出　　处：《通信学报》2017年第5期11-18,共8页Journal on Communications

基　　金：重庆市研究生科研创新基金资助项目(No.CYB14042);重庆市教委科学技术研究基金资助项目(No.KJ1602903)~~

摘　　要：针对存在残留自干扰(RSI)的3节点全双工协作通信系统,研究分布式Alamouti空时码(DASTC)的差错性能。通过分析成对差错概率及其在高发射功率下的渐进表达式,导出了系统的分集增益和编码增益;进一步分析残留自干扰对分布式空时码编码结构的影响,导出了分集增益的可达条件。理论分析和仿真结果表明,在高发射功率和小残留干扰下,DASTC在全双工协作通信系统中是一种全速率、满分集的空时码,在相同频谱效率下的差错性能优于半双工协作通信系统;充分抑制自干扰能获得更高的分集增益和编码增益,并强化分集增益的可达性,提高系统的频谱效率和能量效率。The error performance of distributed Alamouti space-time code （DASTC） was investigated in a 3-node full-duplex （FD） cooperative communication system with the presence of residual self-interference （RSI）. Based on the asymptotic expression of the pairwise error probability in the high transmit power region, the diversity and coding gain were derived. The impact of residual self-interference on the construction of space-time code was analyzed and the achievable condition of diversity gain was obtained. Analytical results show that DASTC achieves full rate and full di- versity in the FD cooperative communication system with high transmit power and low RSI. The error performance of the FD system is superior to which of the half-duplex system under the same spectral efficiency constraint. The diversity and coding gain can be increased by sufficiently suppressing the self-interference, and the spectral efficiency and power effi- ciency can be improved as well.

关 键 词：全双工 协作通信 分布式空时码 成对差错概率 

分 类 号：TN919.3[电子电信—通信与信息系统]