A SEI dual-mode blind equalization algorithm based on T/2 fractionally spaced equalizer
Yang Chao · Journal of Nanjing University of Information Science & Technology · 2009
Aimed at the defects of Super-Exponential Iteration (SEI) algorithm and the algorithm combining SEI algorithm with Decision Directed (DD) algorithm in hard switch mode,the former having mean square error after convergence while the latter having unstable performance,SEI dual-mode algorithm based on T/2 fractionally spaced equalizer is proposed on the basis of analyzing the structure and performance of fractionally spaced equalizer and combining SEI algorithm with DD algorithm in soft switch mode.The proposed algorithm employs SEI algorithm and DD algorithm to update the weight vectors of fractionally spaced blind equalizer,can switch from SEI algorithm to DD algorithm in soft switch mode when an output to the equalizer before the weight vectors of fractionally spaced blind equalizer are updated is equal to one after the updating,and has fast convergence rate and small mean square error.In the proposed algorithm,the spectral overlapping is overcome via fractionally spaced blind equalizer and the channel distortion can be more effectively compensated.The simulation results have verified the validity of the proposed algorithm.