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

JING Nan; BAN Rong-jian; TIAN Li-qin; WANG Lin; LIU Feng

doi:10.12263/DZXB.20201104

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

PAPERS | 更新时间：2025-12-08

- Self-Interference Cancellation for Full Duplex Radios via Zero Crossing Sampling Based on Compensation of Symbol Timing Error
- ACTA ELECTRONICA SINICA Vol. 50, Issue 2, Pages: 305-313(2022)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：10.12263/DZXB.20201104
  CLC： TN929.5
- Received：10 October 2020，
  
  Revised：2021-07-16，
  
  Published：25 February 2022
- 稿件说明：
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荆楠,班容键,田立勤等.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(02):305-313.

JING Nan,BAN Rong-jian,TIAN Li-qin,et al.Self-Interference Cancellation for Full Duplex Radios via Zero Crossing Sampling Based on Compensation of Symbol Timing Error[J].ACTA ELECTRONICA SINICA,2022,50(02):305-313.
荆楠,班容键,田立勤等.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(02):305-313. DOI： 10.12263/DZXB.20201104.

JING Nan,BAN Rong-jian,TIAN Li-qin,et al.Self-Interference Cancellation for Full Duplex Radios via Zero Crossing Sampling Based on Compensation of Symbol Timing Error[J].ACTA ELECTRONICA SINICA,2022,50(02):305-313. DOI： 10.12263/DZXB.20201104.

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.

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.

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references

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