针对船舶噪声和时变多途干扰问题，提出基于双编码策略的水声正交频分复用（DE-OFDM）通信算法。基于信道卷积编码的冗余和记忆特性，将信息比特数量提升多倍，进行约束，得到编码比特，提高通信系统抗船舶噪声和时变多途干扰性能；提出差分编码技术，构建参考相位，利用相邻相位差值进行符号编码，有效消除船舶噪声和时变多途干扰；基于循环前缀技术和OFDM通信技术抗多途特性，有效消除时变多途干扰。进行仿真和100组水箱时变且含船舶噪声信道下的试验，试验结果验证了所提算法的有效性。
In order to solve the problem of ship noise and time-varying multipath interference, an underwater acoustic orthogonal frequency division multiplexing communication algorithm based on dual encoding strategy (DE-OFDM) is proposed. Based on the redundancy and memory characteristics of the channel convolutional coding, the number of information bits is increased by multiple times, the constraints are obtained, and the coded bits are obtained to improve the performance of the communication system against ship noise and time-varying multipath interference. The differential coding technology is proposed, the reference phase is constructed, and the sign coding is carried out by using the difference of adjacent phases, which can effectively eliminate the ship noise and time-varying multipath interference. Based on the cyclic prefix technology and OFDM communication technology, it can effectively eliminate the time-varying multipath interference. Simulation and experiments were carried out 100 groups under the channel of water tank with time-varying and ship noise. Good experimental results demonstrate the effectiveness of the proposed algorithm.
2021,43(8): 135-139 收稿日期：2020-07-22
DOI：10.3404/j.issn.1672-7649.2021.08.026
分类号：TN929.3
基金项目：国家自然科学基金资助项目（61771271）；山东省高等学校科学技术计划项目（J18KA315）；青岛市应用基础研究计划项目青年专项（19-6-2-4-cg）
作者简介：邢延超(1973-),男,博士,副教授,研究方向为数字信号处理,水声通信技术
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