An Improved Dominant Mode Rejection Adaptive Beamforming Algorithm

Dominant mode rejection (DMR) algorithm, applied to low SNR signal circumstance, is a typical eigenspace-based algorithm which has small computational load and fast convergence speed. But for a real adaptive array which applies DMR algorithm, it is important to maintain the robust performance of the adaptive array in different SNR signal circumstances, because it´s hard to obtain prior-knowledge of the strength of the signal. Through analyzing the algorithm structure, this paper proposes an improved DMR algorithm, which rejects the signal components more weakly. Compared with conventional DMR algorithm, the improved DMR algorithm is more robust against signal mismatch, such as DOA mismatch. It has larger array gain´ in high SNR case and maintains satisfying performance in low SNR case as well. Simulation results verify the conclusions