空间电子技术2026，Vol.23Issue(2)：54-61,8.DOI:10.3969/j.issn.1674-7135.2026.02.008
一种天线自干扰消除过程中的群延时校准设计
A group delay calibration design of antenna self-interference cancellation
陈毅君 1丁晟 1焦秉立 2楼韬 1杜晓华1
作者信息
- 1. 浙江时空道宇科技有限公司,上海 200233
- 2. 北京大学信息科学技术学院,北京 100871
- 折叠
摘要
Abstract
In a CCFD(Co-frequency Co-time Full Duplex)system,the key challenge is how to eliminate the self-interference of the receiving terminal and ensure the stability of the elimination results.To address this problem,a transmission group delay calibration method is designed.It focuses on the inconsistency of group delay caused by device variations and temperature drift in multi-channel transmission links.By precisely aligning the signal delays of each transmission channel,the aim is to improve the stability of self-interference cancellation.Firstly,this paper analyzes the influence of the group delay of the transmitter on self-interference cancellation in a full-duplex communication system.When there is a group delay deviation between two transmission channels,and the deviation is not fixed,the residual power of the self-interference after cancellation will fluctuate by more than ten dB,seriously affecting the stability of full-duplex communication.Then,a group delay calibration method is designed using the Lagrange interpolation algorithm,including the composition of the calibration system,processing flow,and detailed design of each module,to achieve high-precision fractional delay with low complexity.Finally,simulation and tests prove that the method is effective.This design can ensure the delay accuracy of the two transmission channels within 1/256 of one sampling period,and the residual power fluctuation after self-interference cancellation does not exceed 2 dB.The accuracy is significantly superior to the traditional fixed delay compensation method,providing effective support for the engineering implementation of full-duplex systems.关键词
同频同时/自干扰消除/群延时校准/拉格朗日插值Key words
CCFD/self-interference cancellation/group delay calibration/Lagrange interpolation分类
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陈毅君,丁晟,焦秉立,楼韬,杜晓华..一种天线自干扰消除过程中的群延时校准设计[J].空间电子技术,2026,23(2):54-61,8.
