Digitally-Assisted Analog Self-Interference Cancellation for STAR System  

作　　者：Pan Wensheng Shi Chengzhe Li Tong Shen Ying Shao Shihai 

机构地区：[1]National Key Laboratory of Wireless Communications,University of Electronic Science and Technology of China,Chengdu 611731,China [2]Laboratory of Electromagnetic Space Cognition and Intelligent Control,Beijing 100089,China

出　　处：《China Communications》2025年第3期36-53,共18页中国通信(英文版)

基　　金：supported in part by the National Natural Science Foundation of China under Grant 62071094;in part by the National Key Laboratory of Wireless Communications Foundation under Grant IFN202402;in part by the Postdoctoral Fellowship Program(Grade C)of China Postdoctoral Science Foundation under Grant GZC20240217.

摘　　要：To enable simultaneous transmit and receive(STAR)on the same frequency in a densely deployed space with multi-interference sources,this work proposes a digitally-assisted analog selfinterference cancellation method,which can acquire reference signals through flexible wired/wireless switching access.Based on this method,the Minimum Mean Square Error algorithm with known channel state information is derived in detail,determining the upper limit of the cancellation performance,and the Adaptive Dithered Linear Search algorithm for real-time engineering cancellation is given.The correctness of theoretical analysis is verified by the practical self-interference channel measured by a vector network analyzer.Furthermore,we have designed and implemented the corresponding multiinterference cancellation prototype with the digitallyassisted structure,capable of handling multiple interferences(up to three)and supporting a large receive bandwidth of 100 MHz as well as a wide frequency coverage from 30 MHz to 3000 MHz.Prototype test results demonstrate that in the presence of three interferences,when the single interference bandwidth is 0.2/2/20 MHz(corresponding to the receive bandwidth of 2/20/100 MHz),the cancellation performance can reach 46/32/22 dB or more.

关 键 词：analog self-interference cancellation channel measurement digitally-assisted multiinterference prototype design simultaneous transmit and receive 

分 类 号：TN975[电子电信—信号与信息处理]