基于极化特性差异的全双工自干扰消除方法  

Full-Duplex Self-Interference Cancellation Method based on Polarization Characteristic Difference

作　　者：谢琛 XIE Chen(Unit 31121 of PLA, Nanjing Jiangsu 210000, China)

机构地区：[1]中国人民解放军31121部队

出　　处：《通信技术》2019年第10期2348-2353,共6页Communications Technology

摘　　要：针对同时同频全双工通信系统中同一节点发射端对接收端的自干扰导致接收信号严重恶化的问题,提出了基于自干扰与目标信号极化特性差异的自干扰消除方法。采用正交双极化天线和虚拟极化技术产生发射信号极化状态,利用斜投影极化滤波器在接收端滤除自干扰,同时建立去极化信道模型,在发射端设置线性预补偿算法抵消无线信道的去极化效应。仿真分析表明,相对于传统的硬件配置和重构干扰信号抵消的方法,所提出的方法能够在信号处理复杂度较低的情况下实现自干扰的有效消除,同时研究了极化估计误差、极化相关程度对滤波器性能的影响。根据性能分析,配置合理的收发信号极化参数、设置预补偿系数能够使斜投影极化滤波器的性能达到最优。Aiming at the problem that the receiving signal is seriously deteriorated due to the selfinterference of the transmitting end of the same node in the same-frequency full-duplex communication system,a self-interference cancellation method based on the difference of self-interference and target signal polarization characteristics is proposed.The orthogonal polarization antenna and the virtual polarization technique are used to generate the polarization state of the transmitted signal,and the oblique projection polarization filter is used to filter the self-interference at the receiving end.At the same time,a depolarized channel model is established,and a linear pre-compensation algorithm is set up at the transmitting end to cancel the depolarization effect of the wireless channel.The simulation analysis indicates that compared with the traditional hardware configuration and the method of reconstructing the interference signal cancellation,the proposed method can effectively eliminate self-interference under the condition of low signal processing complexity.Meanwhile,the effects of polarization estimation error and polarization correlation on filter performance are discussed.And the performance analysis also indicates that by configuring the reasonable transmit and receive signal polarization parameters and setting up the pre-compensation coefficient,the performance of the oblique projection polarization filter can be optimized.

关 键 词：全双工通信 自干扰消除 极化特性 极化滤波器 去极化信道 

分 类 号：TN911[电子电信—通信与信息系统]