水声信道下差分跳频信号检测的优化算法  

A modified detection algorithm for underwater acoustic differential frequency hopping signals

作　　者：梁国龙 刘友永 张光普 

机构地区：[1]哈尔滨工程大学水声技术实验室,黑龙江哈尔滨150001

出　　处：《哈尔滨工程大学学报》2010年第8期1017-1022,共6页Journal of Harbin Engineering University

基　　金：国家自然科学基金资助项目(60802060);哈尔滨工程大学基础研究基金资助项目(HEUFT08026)

摘　　要：为克服水声多途干扰影响,提出将差分跳频技术应用于水声通信,通过分析水声多途信道下差分跳频信号的特征,利用频率转移函数的隐含信息和水声信道的多途特征,优化了频率序列检测的Vitervi硬判决算法,并详细给出了算法流程.在含有加性高斯白噪声的多途信道下进行了仿真.结果表明,采用优化算法的系统性能得到显著提高,在频率检测差错率为10×10-3时,获得了近2.5 dB的增益,表明差分跳频体制能有效克服多途干扰,适用于水声通信.Differential frequency hopping（DFH） was applied to underwater acoustic communications to overcome multi-path interference.After analyzing the characteristic of DFH signals,which had passed through underwater acoustic channels,a modified Viterbi hard-decision algorithm was proposed.It used the hidden information of the G function（frequency transfer function） and characteristics of the multi-path,and a detailed flow chart was worked out.The simulation results showed that the performance of a DFH system with the modified algorithm is better in a multi-path channel with additive white Gaussian noise（AWGN）.2.5 dB gain could result when the code error ratio is 10×10-3.These results proved that underwater acoustic DFH communication is feasible.

关 键 词：差分跳频 频率转移函数 多途干扰 VITERBI算法 

分 类 号：TB567[交通运输工程—水声工程]