Study on Blind Equalization Algorithm Based on T/4 Fractionally Spaced Equalizer
Zhou Qiao-xi · Jisuanji fangzhen · 2007
A new blind equalization algorithm of T/4 Fractionally Spaced Equalizer based on Constant Modulus Algorithm(T/4-FSE-CMA) is proposed to improve the convergence rate and reduce mean square error of the Baud Spaced Equalizer based on Constant Modulus Algorithm(BSE-CMA) and T/2 Fractionally Spaced Equalizer based on Constant Modulus Algorithm(T/2-FSE-CMA) .The formulas of multi-speed system model of four times oversampled received signals and multi-channel system model of single-input-four-output are derived. The sample frequency of T/4-FSE-CMA is bigger than the frequency of Nyquist,so the frequency chaos are avoided and the input signals to equalizer contain more channel information that is of great benefit to tracking the time-varying channel. Comparing with BSE-CMA and T/2-FSE-CMA,the proposed algorithm has the characteristic of faster convergence and smaller mean square error. The efficiency of the proposed algorithm is proved by computer simulation in multi-path water channels.