Ad-Hoc网络环境下基于嵌入式Linux平台的视频传输系统设计

发布时间：2018-05-04 04:09

本文选题：自组网 + 嵌入式系统　；参考：《哈尔滨理工大学》2015年硕士论文

【摘要】：近年来，无线通信发展迅猛，目前市场上也存在很多无线视频传输产品，但是同时能够满足高质量、远距离以及自组网功能的产品却很少。为解决这一矛盾，急需开发出一种新型的视频传输系统。本课题就是在这一背景下提出的，结合Ad-Hoc自组网技术与嵌入式系统技术设计一套Ad-Hoc网络环境下基于嵌入式Linux平台的视频传输系统。本文首先分析了Ad-Hoc网络的特点及其关键技术，，分析了自组网技术的难点。其次，在深入研究和分析Ad-Hoc协议的基础上，对AODV协议及嵌入式Linux系统的相关接口以及网络结构进行研究，提出了该系统网络传输协议的详细设计实现方案。再次，完成嵌入式Linux平台的搭建，包括嵌入式Linux系统的移植、硬件平台的建立，对几种关键芯片的选择做详细分析并给出了性能参数。最后，提出在嵌入式Linux系统上视频传输的具体实现方案，设计完成基于Video4Linux的视频采集模块，并对视频数据进行MPEG-4压缩，完成视频流的实时传输。并分析了在多线程环境下并发嵌入式服务器详细设计思路。在AODV算法实现的基础上，建立Ad-Hoc网络测试环境，在此环境下测试了实时视频数据的采集、传输和显示。实验结果表明：该系统能够实现自组织网络的路由功能，并且网络性能能够满足视频通信的应用要求。
[Abstract]:In recent years, wireless communication has developed rapidly. There are also many wireless video transmission products in the market, but few products can meet the needs of high quality, long distance and ad hoc network function at the same time. In order to solve this contradiction, it is urgent to develop a new video transmission system. Under this background, this paper designs a video transmission system based on embedded Linux platform in Ad-Hoc network environment, combining with Ad-Hoc technology and embedded system technology. In this paper, the characteristics and key technologies of Ad-Hoc network are analyzed, and the difficulties of ad hoc network technology are analyzed. Secondly, on the basis of deep research and analysis of Ad-Hoc protocol, the paper studies the interface and network structure of AODV protocol and embedded Linux system, and puts forward the detailed design and implementation scheme of the network transmission protocol of this system. Thirdly, the construction of embedded Linux platform is completed, including the transplantation of embedded Linux system, the establishment of hardware platform, the selection of several key chips and the performance parameters. At last, the paper proposes a specific implementation scheme of video transmission in embedded Linux system, designs and completes the video capture module based on Video4Linux, and compacts the video data with MPEG-4 to complete the real-time transmission of video stream. The detailed design idea of concurrent embedded server in multi-thread environment is analyzed. Based on the implementation of AODV algorithm, the Ad-Hoc network test environment is established, in which real-time video data acquisition, transmission and display are tested. The experimental results show that the system can realize the routing function of the ad hoc network, and the network performance can meet the requirements of video communication applications.
【学位授予单位】：哈尔滨理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN919.8

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