一种多用户的双向中继系统预编码方案

摘要

A new precoding scheme is proposed for multi-pair two-way relay system in order to improve system performance. 2K users and one relay node are considered in the system, and each pair user communicates with each other via the relay node. All the channels are independent to each other and follow Rayleigh slow fading. Two time slots are needed for transmission. The Signal to Noise Ratio(SNR) for the relay node and the system mutual information are analyzed, and the power allocation scheme is present. Simulation results show that, compared with the traditional precoding scheme, the information of the proposed scheme is improved by 1.2 bit/s/Hz at SNR 25 dB for the relay node.%为提高多对用户双向中继系统的性能,提出一种新的预编码方案.设计具有2K个用户和一个中继节点的系统,每个节点通过中继节点交换信息,节点间的信道相互独立且服从瑞利慢衰落,给出用于信息传输的2个时隙,分析中继节点的信噪比和系统的互信息.仿真结果表明,当中继节点的信噪比为25 dB时,该方案的互信息相比传统方案提高1.2 bit/s/Hz.