Research Of Multi-domain Joint Processing Interference Suppression Algorithom Based On Array

Interference suppression based on multi-domain joint processing has more degree of freedom without increasing the size of atenna array.What's more,multi-domain joint processing is capable of making full use of the combined polarization/frequency/spati al information to effectively distinguish and suppress the interference.On the basis of uniform circular array,to improve the robustness and realizability of multi-domain joint interference suppression algorithm,this thesis has done following work:Firstly,the signal model of space-time and space-time-polarization multi-domain joint processing are presented,and three common algorithms are extended to multi-domain joint procession.On this basis,the advantages of multi-domain joint processing are verified by simulation.Secondly,to solve the null mismatch of multi-domain joint processing interference suppression in the high dynamic situation,a space-time covariance matrix taper(CMT)null broadening method is proposed,where the angular mismatch magnitudes follow the Gaussian distribution.And this method doesn't need the a prior of interference.Simulations proved that the proposed method can improve the dynamic robustness of the minimum variance distotionless response(MVDR)and power inversion(PI).Thirdly,considering increased computational complexity caused by multi-domain joint processing,the joint iterative optimization(JIO)rank reduction method is applied on interference suppression.The dimension of data processing is reduced,and the matrix inversion can be avoid.On this basis,the update frequency can be futher reduced by comparing the output power with a certain threshold value,and the step size can be adaptively adjusted.This improved method is named JIOV.And the author conducts many simulations to explore the interference suppression performance,the retention of the advantages of multi-domain joint procession,and the convergence performance of PI-JIO and MVDR-JIO.Finally,the JIO/JIOV rank reduction and null broadening are comprehensively considered,and the performance of interference suppression and robustness in high dynamic scenario of PI-JIO-CMT and PI-JIOV-CMT are explored by simulations.