Performance Analysis and Method of Image-Rejection for Zero-IF Receiving Digital Array
To solve the problem of image rejection in zero intermediate frequency(IF)receiving digital array beamforming,a single channel zero-IF receiving model is derived.Firstly,a mathematical model of zero-IF receiving digi-tal array is present.A theoretical analysis is then conducted to the array pattern and the image rejection ratio(IRR)per-formance of beamforming when there are both amplitude and phase errors between channels and in-phase/quadrature(I/Q)imbalance errors within channels.Based on the analysis results,random auxiliary phases are introduced into each channel of the digital array,and a beamforming image rejection method suitable for large-scale digital arrays without the need for I/Q imbalance error measurement is proposed.The IRR of the proposed method is related to the number of ar-ray elements.The simulation experiments have verified the correctness of the theoretical analysis and the proposed meth-od in this paper.
国家科技期刊平台
NSTL
万方数据
