两种水声信道模型中信噪比估计算法  

Modifying SNR-Independent Velocity Estimation Method to Make it Suitable for SNR Estimation in Shallow Water Acoustic Communication

作　　者：王海燕[1] 姜喆[1] 申晓红[1] 白峻[1] 

机构地区：[1]西北工业大学航海学院,陕西西安710072

出　　处：《西北工业大学学报》2009年第3期368-372,共5页Journal of Northwestern Polytechnical University

摘　　要：文章研究了水声信道模型和深海垂直信道的信噪比估计的理论和算法,提出了浅海多径信道模型下的信噪比估计算法。利用接收信号对两种水声信道模型下常用数字调制信号和水声跳频信号的信噪比进行估计,用湖测信道对算法进行了仿真。仿真结果表明在实际信噪比为-10~10 dB时,两种信噪比估计算法的结果均良好,估计的均值和实际信噪比的误差均小于1 dB,算法适应性强,性能稳定。浅海多径信道中算法的估计性能不受多径数目的影响,其估计结果略差于深海垂直信道中的估计结果。Ref. 3 gives SNR-independent velocity estimation method. Subsection 1.2 of the full paper discusses the signal model for shallow-water multi-path acoustic channel. Taking full advantage of the fact that carrier frequency is very much lower in water than that in air, subsection 2.2 simplifies greatly Ref. 3 and derives eqs. （15） and （16） needed for implementing the algorithm of SNR estimation in shallow-water acoustic communication. Subsection 3.2 gives shallow-water lake test results in Figs. 3, 4 and 7. Using the lake test results, subsection 3.2 gives computer simulation results in Figs. 5, 6, 8 and 9. The computer simulation results show preliminarily that： （1） the mean estimation error is less than 1 dB for SNR ranging from --10 dB to 10 dB; （2） the estimation results in shallow-water acoustic channel are independent of the number of paths.

关 键 词：信噪比估计 深海垂直信道 浅海多径信道 

分 类 号：TN914[电子电信—通信与信息系统]