一种基于多天线波束成形的全双工自干扰抵消算法

摘要

针对同时同频全双工无线通信系统,当基站采用多根发射天线和多根接收天线进行自干扰抵消时,现有技术多集中于自干扰迫零,缺少对发射机射频噪声抑制的研究.本文在考虑射频噪声抑制的基础上,提出一种收发波束联合成形算法,算法首先以信干噪比最大化为原则,优化接收机天线波束成形向量,给出了算法求解表达式;其次以自干扰最小化为原则,优化发射机天线波束成形向量,给出了算法步骤.仿真结果表明,本文算法在发射机信噪比为30.0dB和60.0dB时,3发3收基站的自干扰抵消值分别为65.5dB和89.8dB,与SVD迫零技术相比,分别有25.5dB和19.8dB的性能改善.%The existing studies focus mainly on the zero forcing of self-interference without the suppression for the RF transmitter noise in the full-duplex base station with multiple transmit and receive antennas.Considering the suppression for the RF transmitter noise,this paper proposes a joint transmit and receive beamforming algorithm.First,we derive the analytical expression of the receiver beamforming vector based on the maximum signal-to-interference-noise ratio(SINR) criterion.The algorithm for designing the transmit beamforming vector is then given by minimizing self-interference.The simulation results show that when the signal-to-noise ratio (SNR) are 30dB and 60dB respectively,the values of the self-interference cancellation are 65.5dB and 89.8dB for the base station with three transmit and three receive antennas.Meanwhile,the corresponding improvement are 25.5dB and 19.8dB respectively compared to the SVD zero forcing scheme.