Low-Complexity Hybrid Adaptive Blind Equalization Algorithm for High-Order QAM Signals
Wei Rao, Changlong Lu, Yuanyuan Liu, Jianqiu Zhang · KSII Transactions on Internet and Information Systems · 2016
It is well known that the constant modulus algorithm (CMA) presents a large steady-state mean-square error (MSE) for high-order quadrature amplitude modulation (QAM) signals.In this paper, we propose a low-complexity hybrid adaptive blind equalization algorithm, which augments the CMA error function with a novel constellation matched error (CME) term.The most attractive advantage of the proposed algorithm is that it is computationally simpler than concurrent CMA and soft decision-directed (SDD) scheme (CMA+SDD), and modified CMA (MCMA), while the approximation of steady-state MSE of the proposed algorithm is same with CMA+SDD, and lower than MCMA.Extensive simulations demonstrate the performance of the proposed algorithm.