Momentum Term and Orthogonal Wavelet-based Blind Equalization Algorithm
Zhou Qiao-xi · Jisuanji fangzhen · 2008
Aiming at the slow convergence rates of Constant Modulus Algorithm (CMA), the expression of the equalizer with orthogonal Wavelet and orthogonal wavelet transform matrix was deduced. Through analyzing orthogonal Wavelet Transform-based CMA (WTCMA) and introducing momentum algorithm into WTCMA, a new Momentum term and orthogonal Wavelet Transform-based CMA(MWTCMA) was proposed. In this proposed algorithm, WTCMA was combined with momentum term, and the convergence rates of the proposed algorithm could be improved by normalizing orthogonal wavelet transform and adding to the momentum term. At the same time, the convergence condition and the computational quantity of the proposed algorithm were studied. Simulation tests with underwater acoustic channel indicate that the convergence rates of the proposed algorithm are faster than those of the CMA and the WTCMA. Accordingly, MWTCMA has better the performance of real time information retrieval and practicability.