Simplified relay antenna selection with source beamforming for MIMO two-way relaying networks

A simplified relay antenna selection with source beamforming (RAS-BF) scheme is advocated for multiple-input multiple-output (MIMO) two-way relaying networks (TWRNs) employing amplify-and-forward (AF) protocol, which does not require channel estimation at the relay node and the optimal relay antenna can be simply determined by comparing the minimum received pilot signaling powers pertaining to each antenna. The theoretical analysis of system outage probability and average symbol error rate (SER) shows that full diversity order can also be achieved by the simplified scheme. Simulation results are provided to verify our theoretical results and further illustrate that the simplified scheme outperforms the outage-optimal counterpart in the presence of channel state information (CSI) imperfections.摘要创新点针对采用放大转发协议的多输入多输出双向中继网络, 提出了一种基于源端波束成形的简化中继天线选择方案。 该方案不要求中继节点进行信道估计, 而仅需比较每根天线接收到的较小导频信号功率即可确定最优中继天线。 通过推导系统中断概率和平均符号错误率, 证明了所提简化方案也可获得满分集阶数。 仿真结果验证了理论分析的正确性, 并进一步说明提出的简化方案在非理想信道状态信息条件下优于中断最优方案。