Blind Equalization Algorithm with Variable Step Size Based on Different Odd Symmetry Error Estimate
Wei Rao · Jisuanji fangzhen · 2007
For studying the influence of different error functions on the performance of blind equalization,different odd symmetry error functions were defined and their features were analyzed,and DOSVCMA(Different Odd Symmetry error estimate based Variable step size Constant Modulus blind equalization Algorithm) was proposed. In DOSVCMA,the mean square error(MSE) could be greatly reduced by using the symmetry of error functions and the convergent speed could be improved based on the performance of variable step size. Under condition of the same parameters charactering variable step size,simulation tests with axial channel with deepwater acoustic track and double path underwater acoustic channel were carried out. The results show that the equalizers designed by different odd symmetry error functions have different performances in convergence speed and MSE and the DOSVCMA outperforms the variable step size based traditional CMA(Constant Modulus Algorithm) in reducing the MSE and improving the convergent speed. Accordingly,the research results provide a means for improving the performance of blind equalizer.