非完美CSI下大规模MIMO DF中继多用户对全双工通信系统性能研究

Research on the performance of massiveMIMO DF relay multi-pair full-duplex communication system under imperfect CSI

通过解码转发(DF)协议中继,研究了在非完美信道状态信息(CSI)下,多用户对双向全双工通信系统的性能.通过配备大量天线,可以大大增加通信系统的频谱效率(SE).对到达中继端的信号采用迫零(ZF)线性接收处理并预编码,推导了SE的近似表达式,提出了与天线数量相关的功率缩放定律,讨论了在导频功率固定和变化条件下缩放因子的取值.所提的功率缩放定律可以在保持稳定的频谱效率的同时,将发射功率降低.研究了在非完美信道状态信息下,经过解码转发协议中继的多用户对双向全双工通信系统的性能.

In this paper,the performance of multi-user pair two-way full-duplex decode-and-forward systems through decoding and forwarding(DF)protocol relaying with imperfect channel state information(CSI)was studied.By configuring massive antennas,spectral efficiency(SE)could be enhanced greatly.Zero-forcing(ZF)was used to receive and precode the signal reaching the relay,and the closed-form expressions for SE were derived.Meanwhile,a power scaling law related to the number of antennas was proposed,and the value range of scaling factor under the condition of fixed and variable pilot power was discussed.Spectral efficiency was maintained stable and the transmission power was reduced by the proposed scaling law.The simulation results showed that SE was improved significantly with the increase of antenna number,which certified the improvement of SE by massive multiple input multiple output(MIMO)system.