基于检测域的水声OFDM系统多普勒频偏补偿  

Doppler Compensation of Underwater Acoustic OFDM System Based on Detection Domain

作　　者：李治 陶鹏 方银宇 李幸群 马雪飞 LI Zhi;TAO Peng;FANG Yinyu;LI Xingqun;MA Xuefei(College of Information Science and Technology,Tibet University,Lhasa 850032,China;China Ship Research and Design Center,Wuhan 430064,China;Glodon Company Limited,Xi’an 710018,China;Wuhan Second Ship Design and Research Institute,Wuhan 430064,China;College of Underwater Acoustic Engineering,Harbin Engineering University,Harbin 150006,China)

机构地区：[1]西藏大学信息科学技术学院,西藏拉萨850032 [2]中国舰船研究设计中心,湖北武汉430064 [3]广联达科技股份有限公司,陕西西安710018 [4]武汉第二船舶设计研究所,湖北武汉430064 [5]哈尔滨工程大学水声工程学院,黑龙江哈尔滨150006

出　　处：《无线电通信技术》2023年第2期209-215,共7页Radio Communications Technology

基　　金：西藏重点研发计划(XZ202101ZY0001F);中国舰船研究设计中心项目(JJ-2020-701-08);中国船舶工业系统工程研究院项目(MC00918);黑龙江省自然科学基金(LH2019A006)。

摘　　要：通信系统发送端和接收端之间的相对运动会使正交频分复用(Orthogonal Frequency Division Multiplexing, OFDM)系统子载波频率因多普勒效应而发生偏移,进而影响整个OFDM通信系统的性能。针对由通信节点之间相对运动而引起的判决结果模糊问题,提出了基于检测域的频偏估计算法。该方法利用连续波(Continuous Wave, CW)信号,首先在频域估计出多普勒因子进行粗补,而后通过检测域的频偏估计算法进行多次迭代对信号进行细多普勒补偿。仿真结果表明,该方法能够很好地弥补信号中未被完全补偿的多普勒频偏,具有良好的抗多普勒引起的载波间干扰(Inter-Carrier Interference, ICI)能力。最后进行了水池实验,验证了算法的可行性。Relative motion between transmitting end and receiving end of communication system will cause sub-carrier frequency of Orthogonal Frequency Division Multiplexing(OFDM)system to be shifted due to Doppler effect,which will affects the performance of entire OFDM communication system.A algorithm is proposed which uses Continuous Wave(CW)signal to estimate Doppler factor in frequency domain through a time-frequency conversion method for rough compensation.And a frequency offset estimation algorithm in the detection domain is also used,where signal is subjected to fine Doppler compensation in multiple iterations in the detection domain.This method has a good ability to resist Doppler-induced Inter-Carrier Interference(ICI).Finally,algorithm simulation is carried out,and pool experiment is carried out to verify the feasibility of the algorithm.

关 键 词：水声通信 频偏估计 检测域 多普勒补偿 

分 类 号：TN929.3[电子电信—通信与信息系统]