摘要
针对水声信道的相位旋转问题,提出了适用于16QAM信号的新的载波恢复算法(NCRA)。对CMA的代价函数进行修改,并以此作为冷启动模式,当误码率足够低时,采用判决域方法切换到判决误差导引(DD)算法模式。该算法不仅能够完成信道均衡、纠正相位旋转,而且可以获得较低的剩余均方误差。采用典型的深海水声信道对该盲均衡算法进行的仿真结果表明:该算法能够很好地完成水声信道的载波相位恢复,对提高水下通信质量具有较高的实用价值。
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 carder 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.
出处
《系统仿真学报》
EI
CAS
CSCD
北大核心
2008年第1期156-157,185,共3页
Journal of System Simulation
基金
江苏省高校自然科学基础研究项目(07KJB510068)
南京信息工程大学科研基金(KY1230)
全国博士论文作者专项基金(200753)
关键词
盲均衡
常数模
误差函数
载波相位恢复
blind equalization
constant modulus
error function
phase recovery
