全双工系统的全数字自干扰消除

摘要

随着无线技术的快速发展,无线频谱资源日益短缺,提高无线频谱利用率已经成为目前无线通信领域的研究热点之一.全双工中继系统因其具有更广的覆盖范围、更大的系统吞吐量以及更有效的频谱效率而受到广泛关注.但在全双工中继技术应用中,通信的同时与同频特性使得中继站出现信号泄露,从而导致了严重的环路自干扰问题,严重影响了通信系统性能的发挥.基于现有全双工系统自干扰消除方案,在分析发射机与接收机电路相位噪声、非线性失真和量化噪声的基础上,采用辅助接收机电路重构射频(Radio Frequency,RF)自干扰信号的副本,在数字域中抵消自干扰信号和发射机的损伤.仿真实验结果表明,所采用的全数字消除方法能够有效消除FD系统的自干扰,显著提升系统效能.%With the rapid development of wireless technology,shortage of wireless spectrum becomes more and more prominent and thus effective utilization of radio spectrum is a hot spot for investigation in current wireless communications.FDR (Full Duplex Relay) systems have paid more attentions due to its wider coverage,larger system throughput and more effective spectrum efficiency.However,the leakage of signal appears because of characteristics in same time and frequency in applications of FDR technology,which leads to serious loop interference and prevents the communication system from its normal performances.On the bases of existing self-interference of FD system cancellation scheme and analysis on transmitter and receiver circuit phase noise,and nonlinear distortion and quantization noise,a copy of self-interference signal from auxiliary receiver circuit reconfiguration RF (Radio Frequency) has been employed to counteract self-interference signal and transmitter damage in the digital-domain.Simulation results show that the use of all-digital self-interference method can effectively eliminate self-interference of FD system and promote the system performance.