A Fractionally-Spaced Decision-Feedback Blind Equalization Algorithm
Sun Yong · Jisuanji fangzhen · 2008
In wireless communication systems,channel equalization technologies must be used to restrain the severe inter-symbol interference(ISI) caused by multi-path fading.Convergence speed and residual ISI are main performance criteria for these equalization algorithms.According to the good convergence ability of the super-exponential iteration(SEI) algorithm,a decision-feedback blind equalization algorithm based on fractionally-spaced SEI algorithm is proposed.Combined with second-order digital phase-locked loop(DPLL2) technology used to correct the phase rotation of the carrier frequency,the performance of the proposed algorithm is verified by computer simulation.Compared with the traditional baud-spaced constant modulus decision-feedback equalization algorithm(BSCMA-DFE),the simulation result shows that the proposed algorithm has the characteristics of faster convergence and less residual ISI.It can correct the phase rotation of the carrier frequency and improve the performances of communication systems so that it is valuable in applications to some extent.