基于符号定时偏差补偿的过零点采样自干扰消除

doi:10.12263/DZXB.20201104

电子学报 ›› 2022, Vol. 50 ›› Issue (2): 305-313.DOI: 10.12263/DZXB.20201104

基于符号定时偏差补偿的过零点采样自干扰消除

荆楠¹^,³, 班容键¹^,³, 田立勤², 王林¹^,³, 刘丰¹

^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

收稿日期:2020-10-10 修回日期:2021-07-16 出版日期:2022-02-25 发布日期:2022-02-25
通讯作者: 田立勤
作者简介:荆楠　女，1978年6月出生，黑龙江人.博士.现为燕山大学信息科学与工程学院副教授，主要研究方向有全双工自干扰消除、跨技术通信、无线感知等. E-mail: jingnan@ysu.edu.cn
班容键　男，1995年7月出生，山西人.燕山大学电子科学与技术学术硕士研究生.研究方向为全双工自干扰消除. E-mail: banrongjian@163.com
田立勤（通讯作者）男，1970年10月生，陕西人.华北科技学院计算机学院教授、院长，国务院政府特殊津贴、教育部新世纪优秀人才获得者，河北省“计算机应用技术”省级重点发展学科负责人，河北省物联网监控工程技术研究中心主任.主要研究方向是物联网远程监控、计算机网络性能评价与安全等. E-mail: tianliqin@ncist.edu.cn
王　林　男，1981年7月出生，甘肃人.现为燕山大学信息科学与工程学院教授.主要研究方向有无线感知、移动计算和物联网信息安全等.E-mail: wlin@ysu.edu.cn
基金资助:
国家自然科学基金(61772453);河北重点研发计划(19270318D);河北省自然科学基金(F2020203074);省、市重点实验室开放课题(IOT202006);河北省应用基础研究计划重点基础研究(17961701D)

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

JING Nan¹^,³, BAN Rong-jian¹^,³, TIAN Li-qin², WANG Lin¹^,³, LIU Feng¹

^1.School of Information Science and Engineering，Yanshan University，Qinhuangdao，Hebei 066004，China
^2.Hebei IoT Monitoring Engineering Technology Research Center，North China Institute of Science and Technology，Langfang，Hebei 065201，China
^3.Hebei Key Laboratory of Information Transmission and Signal Processing，Qinhuangdao，Hebei 066004，China

Received:2020-10-10 Revised:2021-07-16 Online:2022-02-25 Published:2022-02-25
Contact: TIAN Li-qin

摘要/Abstract

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83dB自干扰信号消除水平.

关键词: 全双工, 自干扰消除, 过零点采样, 符号定时偏差

Abstract:

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 achieve 83 dB self-interference cancellation.

Key words: full duplex, self-interference cancellation, zero crossing sampling, symbol timing offset

中图分类号:

TN929.5

荆楠, 班容键, 田立勤, 王林, 刘丰. 基于符号定时偏差补偿的过零点采样自干扰消除[J]. 电子学报, 2022, 50(2): 305-313.

JING Nan, BAN Rong-jian, TIAN Li-qin, WANG Lin, LIU Feng. Self-Interference Cancellation for Full Duplex Radios via Zero Crossing Sampling Based on Compensation of Symbol Timing Error[J]. Acta Electronica Sinica, 2022, 50(2): 305-313.

图/表 11

图1 基于ZCS-STOC双天线全双工自干扰消除系统模型

图2 ySI't与DS的幅值与采样点分布

图3 两种符号定时偏差

图4 基于CP的STO估计技术

图5 STO补偿误差产生原因

表1 OFDM仿真系统参数

仿真参数	值
子载波数量	512
保护间隔	128
调制方式	QPSK
SI发射功率	20 dBm
导频数量	64
DS接收功率	-80 dBm
SNR	30 dB

图6 ZCS-STOC方法与AS方法SICC对比曲线图

图7 两种不同STO估计方法对比曲线图

图8 不同tSTO下的SICC曲线

图9 不同导频数量对SICC影响曲线

图10 不同SNR下的SICC曲线

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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

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