A blind equalization algorithm of underwater acoustic channel suitable for high-order quadrature amplitude modulation signals
Zhao Yuan-dong · Ship Science and Technology · 2008
A new algorithm suitable for high-order QAM signals is presented. A new cost function is defined based on the characteristic of constellation of quadrature amplitude modulation(QAM)signals,from which the real part and image part of error function are used to equalize the in-phase and quadrature components of constellation symbols respectively. A method of nomalization is used for faster convergence. The simulation results show the proposed algorithm has advantages of robustness,better convergence rate and smaller residual mean square error. It may been employed in blind equalization of rapidly changing UWA channels.