基于小波变换的MFSK信号盲解调算法  

A Blind Demodulation Algorithm for MFSK Signal Based on Wavelet Transform

作　　者：高勇[1] 黄振[2] 陆建华[1,2] 

机构地区：[1]清华大学电子工程系,北京100084 [2]清华大学航天航空学院,北京100084

出　　处：《装备指挥技术学院学报》2010年第1期82-87,共6页Journal of the Academy of Equipment Command & Technology

基　　金：国家自然科学基金资助项目(60532070)

摘　　要：针对无先验信息的MFSK（M-ary frequency shift keying）信号提出了一种基于小波变换的盲解调算法。该算法基于morlet小波脊线值与MFSK信号符号之间的对应关系，研究了小波脊线提取、符号率估计、符号同步、调制进制M识别、调制码估计等算法，实现了盲信号的解调。仿真结果表明：2FSK信号的盲解调性能比理论值恶化不超过0．1dB；4FSK信号的盲解调性比理论值恶化约1dB。The paper proposes a blind demodulation algorithm based on wavelet transform which demodulates MFSK（M-ary frequency shift keying）signal without any prior information. According to relationship between the values of morlet＇s wavelet ridges and MFSK symbols, the wavelet ridge extraction, symbol rate estimation, clock synchronization, modulation level identification and symbol identification are accomplished simultaneously in this algorithm. Simulation results demonstrate that the performance degradation of the blind demodulation is only about 0. 1 dB and 1 dB for 2FSK and 4FSK signals, respectively, with respect to the theory bound.

关 键 词：MFSK信号 盲信号 解调 小波变换 小波脊线 算法 

分 类 号：TN971.1[电子电信—信号与信息处理] TN911.33[电子电信—信息与通信工程]