Adaptive Beamforming for Constant Modulus Signal of Interest Based on Acoustic Vector Array

A constant modulus restoral method is presented herein to adaptively extract the signal-of-interest (SOI) with constant modulus, which is a common feature for underwater acoustic communication signals. Considering that the diagonal loading robust adaptive beamforming is required to determine the diagonal loading level adaptively in many applications, the proposed constant modulus restoral diagonal loading robust adaptive beamformer could select the diagonal loading level fully automatically by introducing temporal smoothing technique. Beyond that, it provides increased capability comparing with other robust adaptive beamformers in rejecting interferences and noise while protecting the desired signal. Furthermore, the computation cost is reduced. Simulation results are included to illustrate the performance of the proposed beamformer.