水声OFDM系统多普勒频移和信道的联合估计  

Joint Doppler Frequency Offset Mitigation and Channel Estimation for Underwater Acoustic OFDM

作　　者：黄梅[1] 孙海信[1,2] 程恩[1] 许小卡[2,3,4] 蒯小燕[1] 

机构地区：[1]厦门大学信息科学与技术学院,水声通信与海洋信息技术教育部重点实验室,福建厦门361005 [2]康涅狄格大学电子与计算机工程系,斯托尔斯06269 [3]中国科学院水声环境特性重点实验室,北京100190 [4]中国科学院声学研究所,北京100190

出　　处：《厦门大学学报（自然科学版）》2013年第3期326-332,共7页Journal of Xiamen University：Natural Science

摘　　要：水声通信是近年来研究的热点,但由于水声信道本身的问题,如多径延迟、多普勒频移、信号衰减、窄带宽、时变等特点,使得水声通信传输数据速率低,传输误码率(BER)高.正交频分复用(OFDM)在水声通信中具有很大优势,但它对载波频率偏移(CFO)敏感.基于循环前缀正交频分复用(CP-OFDM)的水声通信系统,对多普勒引起的CFO进行补偿,同时利用延迟-多普勒域中的稀疏性对水声双选信道进行压缩感知信道估计.通过计算机仿真和水池实验,验证了这种双选信道估计的有效性和可靠性.Underwater acoustic communication is a research hotspot in recent years. However, the problem of underwater acoustic channel itself,such as severe multipath delay, doppler shift, signal attenuation, narrow bandwidth, time-varying, led to low data rate and high rate of transmission error. Orthogonal frequency division multiplexing （OFDM） has a great advantage in the underwater a- coustic communication. But it is sensitive to carrier frequency offset （CFO）. We first discuss cyclic prefix orthogonal frequency divi- sion multiplexing （CP-OFDM） system model,then compensate for the CFO caused by the doppler and make CS-based channel esti- mation by exploiting sparsity in the delay-doppler domain. Through computer simulation and pool experiments verified the validity and reliability of this doubly selective channels estimation.

关 键 词：水声通信 正交频分复用 多径 多普勒频移 

分 类 号：TN92[电子电信—通信与信息系统]