中文摘要：

为解决非合作通信系统中水声OFDM信号的类型识别,本文研究水声OFDM通信信号与常见单载波水声数字通信信号（MPSK,MFSK）之间的调制识别问题。考虑到水声信道复杂传播特性对循环前缀相关性的影响,本文通过截取信号前后片段并迭代搜索双相关峰进行无需先验知识的水声OFDM通信信号特征参数提取,在此基础上设计了一种基于模糊系统的水声OFDM通信信号识别器。对不同信道条件下海上实录信号数据的识别实验结果表明了本文方法的有效性。

英文摘要：

In order to identify the type of underwater acoustic OFDM signal in non-cooperative communica- tion system, in this paper, the method to discriminate the orthogonal frequency division multiplexing （OFDM） from common single-carrier digital underwater acoustic communication signals （e.g. MPSK, MFSK） over underwater acoustic channels has been investigated. Considering the correlation characteristics of the cyclic prefix （CP） at the presence of the doubly selective underwater acoustic channels, an iterative dual-peak searching strategy is proposed to extract the CP correlation peak feature without prior knowledge, as the input vector of a fuzzy recognition system for modulation recognition of OFDM signals. The experimental results of modulation classification obtained with field signals at three different underwater acoustic channels show that the proposed method has good performance.