一种天线自干扰消除过程中的群延时校准设计OA

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.