节点文献
基于WiFi的应急通信网络组建及音视频传输的实现
The Implementation of Emergency Network Formation and Real-time Transmission of Audio and Video Based on WiFi
【作者】 高健；
【作者基本信息】 大连理工大学 ， 信号与信息处理， 2011， 硕士
【摘要】 现代意义的应急通信,是指在各种突如其来的紧急情况发生后,综合利用各种通信资源,进行紧急救助和及时通信所需要的一种通信手段和方法。本文的主要内容是利用笔记本电脑或其他便携式设备,实现一种基于WiFi的,支持音视频通信的应急通信网络系统。本文采用了Windows作为主要的载体平台,这主要是因为它在国内的使用范围最广,因此基于该平台所设计的通信系统就会具有很强的通用性。本文的主要工作有如下四个部分：(1)通过对无线自组网的深入研究,寻求一种能够在应急通信网络中进行消息接收与处理的路由协议。(2)深入研究音频和视频的采集、压缩和传输方法,实现音视频数据在自组网中的传输。(3)设计并实现网络系统。(4)通过实验测试,得出结论。经过仔细研究,本文最终选择按需平面距离矢量路由协议作为所组建网络的核心协议内容,并通过在Windows平台下对网络驱动接口进行编程操作将其实现。本文选择在室内环境下进行实验,并得到了较好的实验结果。本系统的优点是具有动态的网络拓扑结构,能够适应各节点的随机移动,并支持音视频的传输,这样就使得节点间的通信变得更为直观和便捷。同时本网络还可以作为应急通信系统而存在,能够在紧急情况发生后快速组建,为救援工作人员提供第一时间和最基本的通信服务。
【Abstract】 The modern conception of emergency communications mainly refers to the methods and means people take to use various communication resources, to rescue survivors when the occurrence of man-made or natural happens. The main contents of this paper is to set up an emergency communication system supporting audio and video transmission, by using laptop or other portable tools, which is based on WiFi. With widely using in the whole country, Windows is chose as the carrier platform, which makes the communication system we designed highly versatile.The main work of the paper:(1) Study the knowledge of wireless ad hoc network in-depth, and finally choose a routing protocol that can receive and process the message in emergency situation.(2) Study the capture, compression and transmission of audio and video, and implement the transmission of audio and video in ad hoc network.(3) Design and implement network systems.(4) Get the conclusion according to the results.In this paper, the core content of route is AODV, which can be implemented through operating the network driver interface. The environment chose to test system is indoor, and the result is good. The system has a dynamic network topology, meanwhile, while supporting audio and video transmission. All of this makes the communication between nodes become more intuitive and convenient. Meanwhile, the network also exits as an emergency communications system, which can be formed quickly and provide rescue staff with timely and basic communication services.