面向阵列级同时同频收发的宽带自干扰空域抑制  

Broadband Spatial Self-Interference Cancellation for Full Duplexing Array

作　　者：林朗 赵宏志[1,2] 邵士海 唐友喜[1,2] LIN Lang;ZHAO Hongzhi;SHAO Shihai;TANG Youxi(National Key Laboratory of Wireless Communications,University of Electronic Science and Technology of China,Chengdu 611731,China;Laboratory of Electromagnetic Space Cognition and Intelligent Control,Beijing 100089,China)

机构地区：[1]电子科技大学通信抗干扰全国重点实验室,成都611731 [2]电磁空间认知与智能控制技术实验室,北京100089

出　　处：《电子与信息学报》2024年第5期1951-1957,共7页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(U19B2014,62071094,61901396)。

摘　　要：具备阵列级同时同频收发能力的多功能一体化平台,面临发射阵列对接收阵列的强自干扰问题。针对这一问题,该文设计了一种宽带自干扰空域抑制方法,构造了限制主波束增益损失条件下,最小化残余自干扰和噪声功率的非凸优化问题,提出了交替迭代的优化算法联合求解发射和接收数字波束成形系数,从理论上分析了所提算法的自干扰抑制极限性能,并给出了所提算法的计算复杂度。分析和仿真结果表明,给定2.4 GHz工作频率,100 MHz带宽,主波束增益损失限制在3 dB时,收发各30阵元的相控阵列宽带自干扰空域抑制能力,即有效各向同性隔离度达到168 dB,距离自干扰抑制性能极限差距7 dB。The multi-functional integrated platform with simultaneous transmit and receive capability faces the strong Self-Interference(SI)coupled between the adjacent transmit and receive arrays.In this paper,a wideband SI cancellation method in the space domain for fully digital phased array systems is designed.A nonconvex optimization problem is formulated to minimize the residual SI and noise power while constraining the loss of beamforming gain in the desired direction,and an alternate optimization method is proposed to jointly determine the transmit and receive beamforming weights,and the SI cancellation performance of the proposed algorithm is analyzed.Theoretical analysis and simulation results show that a 60-element array can achieve an Effective Isotropic Isolation(EII)of 168 dB when the central frequency is 2.4 GHz,the bandwidth is 100 MHz,and the beamforming gain loss is limited to 3 dB,which is 7 dB below the EII upper bound.

关 键 词：同时同频收发 数字波束成形 空域自干扰抑制 

分 类 号：TN911.7[电子电信—通信与信息系统]