Multi-modulus blind equalization algorithm based on modified modulus decision
Guo Ye-ca · Jisuanji yingyong yanjiu · 2014
The multipath propagation and Doppler frequency shift in the communication fields effect always introduced intersymbol interference( ISI) and phase deflection in the receiver and affected communication quality seriously in the communication quality. Although multi-modulus blind equalization algorithm based on modulus decision( MDMMA) could overcome the amplitude distortion of the received signal,but could not correct phase rotation. Aiming at these problems,this paper proposed a multi-modulus blind equalization algorithm based on modified modulus decision( MMDMMA),this algorithm defined a new cost function updating the weight vector iteration formula. It extracted phase information of the transmitted signals could correct the phase rotation of the received signals,the variable leakage factor could accurately track time-varying signals,and by using decision feedback equalization structural performance,the inter-symbol interference of the received signal was can be reduced further. Simulation results show that this proposed algorithm is better than MDMMA algorithm,residual inter-symbol interference is reduced about 15 dB comparison with MDMMA,output signal constellations are more compact,and the phase rotation has been corrected.