基于模拟遗传算法的水声时变多普勒频偏估计  

Underwater Acoustic Time-varying Doppler Frequency Offset Estimation Based on Simulated Annealing Genetic Algorithm

作　　者：张舒然 武岩波[1,3,4] 朱敏 房小芳[1,3,4] ZHANG Shuran;WU Yanbo;ZHU Min;Fang Xiaofang(Ocean Acoustic Technology Center,Institute of Acoustics,Chinese Academy of Sciences,Beijing,100190,China;University of Chinese Academy of Sciences,Beijing,100190,China;State Key Laboratory of Acoustics,Institute of Acoustics,Chinese Academy of Sciences,Beijing,100190,China;Beijing Engineering Technology Research Center of Ocean Acoustic Equipment,Beijing,100190,China)

机构地区：[1]中国科学院声学研究所,海洋声学技术中心,北京100190 [2]中国科学院大学,北京100190 [3]中国科学院声学研究所,声场声信息国家重点实验室,北京100190 [4]北京市海洋声学装备工程技术研究中心,北京100190

出　　处：《网络新媒体技术》2020年第6期45-50,共6页Network New Media Technology

摘　　要：水声通信中由于收发装置间相对运动会引起较大的多普勒频移。为了实现正确的解调和译码,多普勒估计技术一直是正交频分复用(OFDM)水声通信系统的关键部分。针对多重信号分类(MUSIC)中传统谱峰搜索计算复杂度高的问题,提出了一种基于模拟遗传算法的OFDM时变多普勒频偏估计方法。利用OFDM调制波形中非均匀空载波信号,接收端中借助MUSIC方法得到关于多普勒频偏的谱函数,采用模拟遗传算法快速求解谱函数极值解从而得到多个符号上时变多普勒频偏的联合估计。仿真结果表明,该方法相较于传统的谱峰搜索算法计算复杂度低,搜索效率更高。In underwater acoustic communication,the relative motion between the transmitter and the receiver will cause large Doppler shift.In order to achieve correct demodulation and decoding,Doppler estimation is always the important part of orthogonal frequency division multiplex(OFDM)underwater acoustic communication system.To solve the problem of high complex computation when searching peak in multi-signal classification(MUSIC),a time-varying Doppler frequency offset estimation method based on simulated annealing genetic algorithm is proposed.By using the non-uniform space carrier signal in the transmitter of OFDM,the spectrum function with Doppler frequency offset in the receiver is obtained by using MUSIC method.By using the simulated annealing genetic algorithm,the extreme value solution of the spectrum function is solved quickly to obtain the joint time-varying Doppler frequency offset estimations on multiple symbols.Simulation results show that this method is more efficient than the traditional spectral peak search algorithm,and has lower complex computation.

关 键 词：模拟遗传算法 时变多普勒频偏估计 MUSIC算法 非均匀空载波 OFDM水声通信 

分 类 号：TN929.3[电子电信—通信与信息系统] TP18[电子电信—信息与通信工程]