Blind Equalization of Underwater Acoustic Channel Using a Kind of Sign Decision Double Modulus Algorithm
Guo Ye-cai · Jisuanji fangzhen · 2007
Aiming at large Mean Error Square(MSE) of Constant Modulus Algorithm(CMA) and low convergence rate of Double Sign Error CMA(DSECMA),a Sign Decision Double Modulus Algorithm(SDDMA) based on the stability of the CMA and the low computational complexity of DSECMA,was proposed.The iteration process of the proposed algorithm can alternate automatically between CMA and DSECMA via comparing the sign of square error between the modulus of equalizer output sequence and that of arbiter output sequence.It has lower computational complexity than CMA,smaller MSE than the CMA and the DSECMA,and higher convergent speed than the CMA and the DSECMA.Therefore,it is very suitable for the real recovery of the underwater data transmission.The performance of the SDDMA is proven via computer simulation for the equalization of the underwater acoustic channel.