Low-Cost Maximum Entropy Covariance Matrix Reconstruction Algorithm for Robust Adaptive Beamforming
This work addresses the computational complexity of adaptive beamforming for signal processing engineers, offering an incremental improvement in algorithm efficiency.
The paper introduces a low-complexity adaptive beamforming technique that uses a stochastic gradient algorithm to avoid matrix inversions. It employs maximum entropy power spectrum (MEPS) to estimate the noise-plus-interference covariance matrix and reconstruct the desired signal covariance matrix, resulting in superior performance over previous beamformers.
In this letter, we present a novel low-complexity adaptive beamforming technique using a stochastic gradient algorithm to avoid matrix inversions. The proposed method exploits algorithms based on the maximum entropy power spectrum (MEPS) to estimate the noise-plus-interference covariance matrix (MEPS-NPIC) so that the beamforming weights are updated adaptively, thus greatly reducing the computational complexity. MEPS is further used to reconstruct the desired signal covariance matrix and to improve the estimate of the desired signals's steering vector (SV). Simulations show the superiority of the proposed MEPS-NPIC approach over previously proposed beamformers.