【作者】 赵丹；

【导师】 谈振藩；

【作者基本信息】 哈尔滨工程大学 ， 控制理论与控制工程， 2003， 硕士

【摘要】 随着人们开发和利用海洋步伐的加快，水下数字通信技术的研究越来越受到人们的重视，逐渐成为水声研究领域中最具挑战性的课题之一。尤其是在水下蛙人潜水、饱和潜水、对潜通讯等场合，语音通信是最直接的通信手段。在带宽严重受限的水声信道中实现高数据率通信，必须使用高带宽利用率调制技术，并结合自适应均衡等技术以有效地克服信道多途传播产生的符号间干扰。 本文以克服多途干扰这一主要矛盾，实现高数据率、高可靠性的水声通信为出发点，以相位相干调制和自适应均衡等技术为主要研究内容，所做的工作主要如下几个方面： 1．本文详尽的研究了线性和非线性自适应均衡器的横向结构和典型算法(LMS和RLS)，对其性能进行了仿真比较；对相位相干调制解调技术的实现，尤其是载波恢复的方法进行研究，将载波恢复系统和自适应均衡器的参数调整联合起来，从而提高相干水声通信系统的性能。 2．在吉林松花湖作了水声通信试验，验证了上述算法的仿真结论，并对水声通信的关键技术之一的相关同步技术进行了分析研究。 3．对水下语音通信系统进行方案设计论证，完成编码调制、均衡和解调在硬件系统上的实时实现。更多还原

【Abstract】 In order to achieve high data rates on the severely band-limited underwater acoustic(UWA) channels, bandwidth-efficient modulation techniques must be employed, together with some sophisticated signal processing algorithms, such as adaptive equalization technique for the intersymbol interference caused by channel multipath propagation.To attain reliable high data rate transmission over UWA channels, phase-coherent technology and adaptive equalization technology are selected as major research issue. The main content in this paper are as follows:1.A11 kinds of linear and nonlinear adaptive equalization and typical arithmetic are studied elaborately. And their performances are compared by simulation. The realization of phase-coherent modulation is studied, especially the carrier recovery. In order to improve the system performance, we consider a receiver which performs optimal phase synchronization and channel equalization jointly.2. A UWA communication system is designed, lake experiments are also conducted with several equalization methods being employed. One key of the techniques in underwater acoustic communication-synchronization technique is studied. 3. Finish demonstrating, designing and realizing an underwater voicecommunication system. Code, modulation, equalization and demodulation are realized in real-time.更多还原