乘积转发型双向中继网络性能分析及功率控制研究

在高斯信道下，乘积转发（Product-and-forward, PF）双向中继网络可以提供比放大转发（Amplify and forward, AF）双向中继网络更低的误符号率（Symbol-error rate, SER）。为了研究PF中继网络在瑞利衰落信道下的性能，推导出了PF中继网络的SER性能渐进表达式，且理论分析显示PF中继网络比AF中继网络拥有更好的SER性能。仿真结果和理论分析吻合，充分验证了该表达式的合理性与PF中继网络的优越性。为了进一步提高PF中继网络的SER性能，以发射总功率为约束条件，提出了最小化SER的功率控制算法。仿真结果表明所提算法可以显著提高系统SER性能。

Performance Analysis and Power Allocation for Two-Way Product-and-Forward Relay Networks

Two-way product-and-forward (PF) relay networks can provide lower asymptotic symbol-error rate (SER) than amplify-and-forward (AF) relay networks. In order to study the performance of PF relay networks over Rayleigh fading channels, the asymptotic SER expression of the PF relay networks is derived and analytical results show that PF relay networks have better SER performance than AF relay networks. Experimental results agree well with the analytical results. In order to enhance the SER performance of PF relay networks, a power allocation algorithm to minimize SER under total transmit power constraint is proposed. Simulations show that proposed algorithm can significantly enhance the SER performance.