Blind Equalization Algorithm Suitable for 16QAM Signals for Carrier Recovery of Underwater Acoustic Channel
Jinzhu Liu · 2008
For correcting phase rotation of underwater acoustic channel, a new phase recovery algorithm (NCRA) suitable for 16QAM was proposed. Firstly, a modification to CMA cost function was proposed and implemented at the first mode. Secondly, the proposed algorithm switched over to Decision-Directed equalization scheme smoothly once the error level was reasonably low by decision region. These algorithms might not only recover carrier phase, but also achieve lower residual mean squared error. The proposed algorithm was simulated using a typical deepwater channel. The result shows that the proposed algorithm can effectively achieve phase recovery of underwater acoustic channel.