时间异步全双工数字域分段卷积自干扰抑制技术  

A Timing Asynchronous Full Duplex Digital Self-interference Suppression Method by Segment Convolution

作　　者：李彤 沈莹[1] 潘文生[1] 邵士海[1] 唐友喜[1] LI Tong;SHEN Ying;PAN Wensheng;SHAO Shihai;TANG Youxi(National Key Laboratory of Science and Technology on Communications,University of Electronic Science and Technology of China,Chengdu 611731,China)

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,成都611731

出　　处：《电子与信息学报》2022年第4期1395-1401,共7页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(U19B2014,61771107,62071094,61701075,61601064,61531009);国家重点研发计划(2018YFB1801903);四川省科技项目(2020YFH0101)。

摘　　要：同时同频全双工(CCFD)多载波信号时间异步场景下,有用信号(SoI)与自干扰信号(SI)多径最大时差超出循环前缀长度(CP),有用信号与自干扰信号子载波不正交,造成频域自干扰抑制性能严重下降。针对上述问题,该文提出一种时间异步数字域分段卷积的自干扰抑制方法,建立了自干扰分段、频域重建、叠加抵消的自干扰抑制过程,提升了时间异步场景下自干扰抑制性能。理论和仿真结果表明,在异步场景下,采用分段卷积的自干扰抑制方法可以直接在频域重建自干扰,达到与同步场景相当的干扰抑制性能。At the Co-frequency and Co-time Full Duplex(CCFD)multi-carrier signal time asynchronous scenario,,the maximum multipath time offset between the Signal of Interest(SoI)and the Self-Interference(SI)exceeds the length of the Cyclic Prefix(CP),which causes the decrease of the performance in the frequency domain self-interference cancellation.In view of this problem,a timing asynchronous self-interference suppression method by segment convolution is proposed;The relationship between the SI and the SoI is analyzed;The SI suppression process is established.Theoretical and simulation results show that the cancellation performance in the asynchronous state is equivalent to that in the synchronous state.

关 键 词：无线通信 同时同频全双工 数字域自干扰抑制 时间异步 

分 类 号：TN911.7[电子电信—通信与信息系统]