Abstract: In this paper, outage and diversity performance of amplify-and-forward（AF） for two-way relay system are investigated under the Rayleigh fading channel. The range of the signal-to-noise ratio is optimized by the aid of the relationship between the signal-to-noise ratios of the source nodes and reconcile inequality. Hence the new outage probability lower bound is derived. Simulation results show that the outage probability obtained by Monte Carlo simulation approaches to a new outage probability lower bound; in the case of multi-relay selection, the system based on maximum minimum mutual information criterion still obtains the full diversity gain and optimizes the outage probability lower bound.

Key words: amplify-and-forward, two-way relay system, outage performance, maximum minimum mutual information criterion, full diversity gain

摘要： 主要研究了瑞利衰落信道下基于放大转发策略的双向中继系统的中断性能及分集性能。首先利用信源节点信噪比间的关系和调和不等式对信噪比的范围进行优化，得到新的中断概率下界，仿真结果表明Monte Carlo仿真得到的中断概率接近新得到的中断概率下界；同时证明了多中继存在时，基于最大最小互信息准则的双向中继系统仍然取得全分集增益且能够优化中断概率下界。

关键词: 放大转发, 双向中继, 中断性能, 最大最小互信息准则, 全分集增益