一种基于多天线波束成形的全双工自干扰抵消算法  

A Novel Self-Interference Cancellation Algorithm Using Multi-Antenna Beamforming in Full-Duplex System

作　　者：吴飞[1] 邵士海[1] 唐友喜[1] 

机构地区：[1]电子科技大学通信抗干扰技术国家级重点实验室,四川成都611731

出　　处：《电子学报》2017年第1期8-15,共8页Acta Electronica Sinica

基　　金：国家自然科学基金(No.61501093;No.61531009;No.61271164;No.61471108;No.61201266);国家科技重大专项(No.2014ZX03003001-002);国家863高技术研究发展计划(No.2014AA01A704;No.2014AA01A706;No.2015AA01A701);教育部与中移动研究基金(No.MCM20130111)

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30.0d B和60.0d B时,3发3收基站的自干扰抵消值分别为65.5d B和89.8d B,与SVD迫零技术相比,分别有25.5d B和19.8d B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 showthat when the signal-to-noise ratio（ SNR） are 30 d B and 60 d B respectively,the values of the self-interference cancellation are 65. 5d B and 89. 8d B for the base station with three transmit and three receive antennas. Meanwhile,the corresponding improvement are 25. 5d B and 19. 8d B respectively compared to the SVD zero forcing scheme.

关 键 词：无线通信 自干扰抵消 多天线 同时同频全双工 波束成形 信干噪比 发射机噪声 

分 类 号：TN92[电子电信—通信与信息系统]