基于符号定时偏差补偿的过零点采样自干扰消除  

Self-Interference Cancellation for Full Duplex Radios via Zero Crossing Sampling Based on Compensation of Symbol Timing Error

作　　者：荆楠[1,3] 班容键 田立勤 王林[1,3] 刘丰[1] JING Nan;BAN Rong-jian;TIAN Li-qin;WANG Lin;LIU Feng(School of Information Science and Engineering,Yanshan University,Qinhuangdao,Hebei 066004,China;Hebei IoT Monitoring Engineering Technology Research Center,North China Institute of Science and Technology,Langfang,Hebei 065201,China;Hebei Key Laboratory of Information Transmission and Signal Processing,Qinhuangdao,Hebei 066004,China)

机构地区：[1]燕山大学信息科学与工程学院,河北秦皇岛066004 [2]华北科技学院河北省物联网监控工程技术研究中心,河北廊坊065201 [3]河北省信息传输与信号处理重点实验室,河北秦皇岛066004

出　　处：《电子学报》2022年第2期305-313,共9页Acta Electronica Sinica

基　　金：国家自然科学基金(No.61772453);河北重点研发计划(No.19270318D);河北省自然科学基金(No.F2020203074,No.F2020203043);省、市重点实验室开放课题(No.IOT202006);河北省应用基础研究计划重点基础研究(No.17961701D)。

摘　　要：针对系统存在符号定时偏差时造成自干扰信号过零点漂移,进而导致过零点采样自干扰消除方法性能失效问题,本文提出一种符号定时偏差补偿的信号过零点采样自干扰消除方法 .首先,利用辅助信号设计与自逆多项式根存在原理得到计算过零点的数学模型.其次,通过分析两种不同符号定时偏差对接收信号的影响,采用差值法和相关函数法计算系统符号定时偏差.最后,根据信道估计方法计算出系统同步条件下的过零点时刻,然后利用符号定时偏差估计值对上述过零点时刻进行补偿,进而得到系统存在符号定时偏差时的过零点采样时刻集合.仿真结果表明,所提方法在系统存在符号定时偏差时仍然能准确计算过零点集合,实现83 dB自干扰信号消除水平.For the problem that the zero-crossing point of self-interference signal drifts when the system has symbol timing errors, which causes the zero-crossing sampling self-interference elimination method to fail, this paper proposes an improved zero-crossing sampling self-interference elimination method based on symbol timing error compensation. First,the mathematical model for the zero-crossing calculation is obtained by leveraging the auxiliary signal design and the existence principle of the roots of the self-reverse polynomial. Secondly, by analyzing the effects of two different symbol timing errors on the received signal, the difference method and the correlation function method are used to calculate the system symbol timing error. Finally, according to the channel estimation method, the zero-crossing time is calculated when the system is synchronized, and is compensated by the estimated symbol timing error to achieve the set of zero-crossing sampling time when the system is non-synchronized. The simulation results show that the proposed method can still accurately calculate the zero-crossing sampling set in the presence of symbol timing error, and achieve83dB self-interference cancellation.

关 键 词：全双工 自干扰消除 过零点采样 符号定时偏差 

分 类 号：TN929.5[电子电信—通信与信息系统]