基于LMS算法对数字通信接收器中载波恢复系统的研究  

Research on carrier recovery system in digital communication receiver based on LMS algorithm

作　　者：井庆丰[1] 石磊[2] 仲伟志[1] 陆宇平[1] 严晓菊[3] 

机构地区：[1]南京航空航天大学航天学院,南京210016 [2]哈尔滨工业大学,哈尔滨150001 [3]河海大学水文水资源学院,南京210098

出　　处：《北京交通大学学报》2013年第2期44-48,56,共6页JOURNAL OF BEIJING JIAOTONG UNIVERSITY

基　　金：国家自然科学基金资助项目(61102069);南京航空航天大学基本科研业务费资助项目(NN2012022;NP2011048)

摘　　要：利用LMS算法构成数字通信接收器的载波恢复系统,能够使单频率和多频率的正弦相位抖动,对多普勒频移造成的相位偏移进行自适应补偿.本文在给出算法的补偿原理后,利用Matlab仿真环境,以8PSK信号为例对补偿过程进行分析,利用学习曲线的分析研究了系统的收敛性能,利用信号星座图和相位差功率谱直观看出了算法的补偿效果.结果证明:对单频率相位抖动能够衰减25 dB左右,双频率能够衰减15 dB左右;经系统补偿后信号和只含有高斯白噪声的数字信号星座图非常接近.The LMS algorithm used in the carrier recovery system in this article can compensate the phase offset due to Doppler shift and sinusoid phase jitters with single or multiple tones.Taking 8PSK signals as an example,simulation results are obtained.The direct compensation performances can be easily observed through the signal constellations.The MSE curves illustrate the converge speed of the method.The power spectrum indicates the compensation ability qualitatively.The results indicate that the signal constellation after compensation is almost the same as that with only AWGN（Additive White Gauss Noise）.And the single and two tones phase jitter can be reduced by 25 dB and 15 dB,respectively.

关 键 词：载波恢复 多普勒频移 相位抖动 LMS算法 

分 类 号：TN911.72[电子电信—通信与信息系统]