This paper proposes a relay selection protocol for two-way product-and-forward (RS-PF) relay networks to improve the performance of symbol error rate (SER). In the proposed scheme, an optimal relay that maximizes the minimum signal-to-noise ratio (SNR) of two sources will be selected to calculate the product of signals transmitted by two sources and broadcast the product results to both sources. The asymptotic SER expression of the RS-PF relay networks is derived. Simulation results show that RS-PF relay networks can effectively improve over 1dB on the SER performance of system than the two-way amplify-and-forward (RS-AF) relay network, which has the same relay selection criterion as RS-PF.%为提高双向中继系统误符号率性能,提出一种基于乘积转发双向中继系统的中继选择策略.在该策略中,系统挑选出最大化最小源节点接收信号信噪比的中继节点,然后由该节点对来自两个源节点的信号做乘积处理,并将乘积结果转发至源节点.推导出了该策略的误符号率渐进表达式.仿真结果表明在高信噪比多中继节点情况下,采用相同中继选择标准,乘积转发双向中继系统可以获得较放大转发双向中继系统1 dB以上的误符号性能提升.
展开▼
