不对称双向中继信道中的再生双向中继选择及功率分配  

Opportunistic Relaying and Power Allocation for Bidirectional Regenerative Relaying in Asymmetric Two-way Relay Channels

作　　者：吉晓东[1,2] 郑宝玉[1] 崔景伍[1] 

机构地区：[1]南京邮电大学信号处理与传输研究院,南京210003 [2]南通大学电子信息学院,南通226019

出　　处：《电子与信息学报》2013年第7期1707-1712,共6页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(61071086;61071093;61271240);江苏自然科学基金重点(BK2010077);东南大学移动通信国家重点实验室开放研究基金(2011D05);江苏省高校自然科学研究项目(11KJB510018;12KJB510024)资助课题

摘　　要：该文研究不对称双向中继信道下的被动式再生中继选择问题。首先,通过理论分析给出了传统3节点网络的可达速率域。然后,在瑞利衰落信道环境下,理论推导了系统中断概率的闭合表达式。接着,利用系统业务知识和信道状态信息,提出一种改进型的最大最小中继选择准则。进一步,研究中继端叠加信号的功率分配,提出了两种功率分配因子选择算法,并对所提算法进行了理论分析。仿真结果表明:通过被动式再生中继选择和功率分配可以显著提高系统的中断性能,在信道不对称情况下性能优势明显。The problem of reactive relay selection for two-way decode-and-forward relaying is investigated.First,the achievable rate region of conventional three-node scenario is characterized.Then,a closed-form expression of the outage probability is derived.Next,by using the channel state information and with the aid of traffic knowledge,a reactive relay selection criterion is proposed.Further,optimal power allocation between superposed signals at the relay is investigated.As a result,two novel policies selecting the optimal scaling coefficients are presented and analyzed in terms of outage probability.Simulation results demonstrate that the system outage performance is improved significantly,especially when the channels are asymmetric.

关 键 词：无线通信 双向中继 解码转发 中继选择 不对称信道 

分 类 号：TN925[电子电信—通信与信息系统]