Symmetry-Constrained Concurrent CMA and DD Algorithm for Adaptive Multi-Antenna System

This paper proposes a powerful symmetry- constrained concurrent blind filter (SC-CBF) for adaptive multi- antenna beamforming systems. The proposed SC-CBF beamformer is created according to the concurrently activated symmetry-constrained constant modulus algorithm (SC-CMA) and symmetry-constrained decision-directed filter (SC-DD). Both SC-CMA and SC-DD are obtained from a generalized ideal weight property, which is derived based on an ideal blind beamforming weight expression. Following the generalized ideal weight property, the performance of the SC-CBF beamformer is quite robust to the error propagation occurring in low signal-to-noise ratios compared to the traditional CBF one. The simulation results have shown that the proposed SC-CMA and SC-CBF beamformers provide much faster convergence rates than the existing adaptive blind beamformers.