直接序列扩频水声通信及组网技术研究
文献类型：学位论文
| 作者 | 王晋兴 |
| 学位类别 | 博士 |
| 答辩日期 | 2009-05-27 |
| 授予单位 | 中国科学院声学研究所 |
| 授予地点 | 声学研究所 |
| 关键词 | 直接序列扩频 码分多址接入(CDMA) 假设反馈均衡 水声通信网 介质访问控制协议（MAC） |
| 其他题名 | Research on Direct Sequence Spread Spectrum Underwater Acoustic Communication and Networking |
| 学位专业 | 信号与信息处理 |
| 中文摘要 | 随着对海洋的开发和科学考察活动的增加，以水声通信技术为基础的水声通信网成为当前研究的热点方向。扩频技术（Spread spectrum technology）具有强抗干扰能力、低截获概率、支持多用户同时通信的特点，在保密水声通信、长距离水声通信、可靠传输和网络通信方面有着重要的价值。本文分别从物理层通信技术和数据链路层介质访问控制协议（MAC）两方面开展基于直接序列扩频的水声通信及组网技术研究。 首先研究并实现了水声DS/SS-CDMA通信中的码片速率假设反馈自适应均衡算法，经海试检验，算法工作性能良好。其次设计和实现了基于CDMA通信体制的水声通信网MAC协议；通过仿真实验对协议的特性和性能进行研究，指出影响协议性能的参数、因素。 研究工作的创新点包括： 1. 以空间分集－多普勒频移补偿－自最佳自适应判决反馈均衡算法为基础，研究并实现了水声DS/SS-CDMA通信中的码片速率假设反馈自适应均衡算法，做为水声通信网的物理层通信技术。海上通信试验结果表明：算法的性能良好，可以获得低通信误比特率；在快变的水声信道条件下算法性能优于国外公开文献报道的水声DS/SS-CDMA算法的性能。 2. 以远程隐蔽观测、多AUV协同作业、海洋环境监测为水声通信网的应用背景，研究并实现了基于CDMA体制的水声通信网MAC协议。充分利用CDMA支持多用户同时通信的特性，所设计的协议具有低开销，低能耗的特点。 3. 将实际海上试验环境、数据的分析结果应用到仿真建模中，构建了接近实际通信特性的水声网络物理层仿真模型。以此模型为平台进行网络协议的研究和仿真，计算的结果对实际应用更具有指导意义。 |
| 英文摘要 | Underwater Acoustic Network (UWAN) has a lot of applications in undersea natural resources exploration and scientific missions. Technologies behind the UWAN now attract more and more researchers’ attention and interests. Spread spectrum (DS/SS) technology has high interference rejection and low probability of interception, and can simultaneously support multiple users. It is valuable in covert underwater communication, long distance underwater communication, highly reliable underwater communication and underwater network communication. In this dissertation presented the researches on underwater acoustic communication and medium access control (MAC) protocols based on direct sequence spread spectrum technology. Firstly, a chip-rate hypothesis decision feedback equalization algorithm for DS/SS underwater acoustic communication is presented. The sea trial results show that the overall performance of this algorithm is satisfactory. Secondly, MAC protocol based on the studied DS/SS underwater acoustic communication technology is researched and designed. The presented MAC protocol’s characteristics and performance are evaluated through computer simulation. The key achievements of this dissertation are as following： 1. Based on the Space-diversity Doppler-compensation Fast Self-Optimized adaptive decision feedback equalization algorithm, a chip-rate hypothesis decision feedback equalization algorithm for direct sequence spread spectrum (DS/SS) underwater acoustic communication is presented and implemented. The sea trial proved that the algorithm could achieve good and stable performance with very low bit error rate (BER). Further analysis show that the presented algorithm has better performance than the others described in published papers. 2. Dedicated to remote covert surveillance, multi-AUV co-operation and underwater monitoring applications, a MAC protocol based on the CDMA communication technology is presented. With fully implementation of CDMA’s capability of receiving multiple signals simultaneously, the MAC protocol has low control overhead and low power consumption. 3. A UWAN protocol simulation platform is built based on the underwater channel and communication characteristics modeled from the sea trail data. That makes the simulation results a step closer to real underwater network communicating. |
| 语种 | 中文 |
| 公开日期 | 2011-05-07 |
| 页码 | 131 |
| 源URL | [http://159.226.59.140/handle/311008/486]  |
| 专题 | 声学研究所_声学所博硕士学位论文_1981-2009博硕士学位论文 |
| 推荐引用方式 GB/T 7714 | 王晋兴. 直接序列扩频水声通信及组网技术研究[D]. 声学研究所. 中国科学院声学研究所. 2009. |
入库方式： OAI收割
来源：声学研究所
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