【作者】 张良；

【导师】 申金媛；

【作者基本信息】 郑州大学 ， 电子与通信工程（专业学位）， 2018， 硕士

【摘要】 随着科学技术的不断发展以及信息化生活的不断改善,视频传输技术在日常生活以及各项工作建设中的需求也在日益增长,其应用场景也越来越广泛。最初的视频传输主要通过有线网络为主,但在没有有线网络覆盖的地方,视频失去传输媒介,为解决上述问题,可以使用公共无线网络进行传输。然而在遇到重大事件和自然灾害时,公共网络占用率达到峰值,因此自建无线网络成为众多行业商家和公共部门进行视频传输的最佳方案。无线MESH网络作为典型的无线多跳网络,同时具有无线局域网以及Ad Hoc网络的优点,如部署安装相对简便、稳定性好、结构相对灵活、更易获得高带宽等。因此,将无线MESH网络应用于无线视频传输,既可以满足用户对视频传输的基本需求,又能够大幅降低网络部署的资金投入。本文首先介绍了音视频传输技术的发展历程、现状以及无线MESH网络的发展历程和技术优势。其次,分别从车载无线图传的移动MESH组网,单兵无线图传的移动MESH组网,以及音视频综合移动MESH组网三个方面进行设计和研究,并将组网设计方案应用于实际项目的测试和实施,实现了稳定、高效的视频传输,并在保证视频传输流畅的前提下,通过参数调整使视频传输达到更高的码率以提高视频清晰度。具体来讲,在车载无线图传的移动MESH组网设计中,使用多台车载MESH设备组网,通过测试网络速率、视频码率、车速等重要参数对无线信号的影响,设计合理的组网模式,进而搭建出标准的车载MESH组网系统。在单兵无线图传的移动MESH组网设计中,用多台单兵MESH图传设备组网,通过实测设计出基于最优信号和视频质量的单兵无线视频传输组网模式,进而为同类项目设计出一个统一的组网模式。在音视频综合移动MESH组网设计中,为实现一座城市当中无线视频传输的全城覆盖,利用单兵MESH图传设备、车载MESH图传设备、安置在基站上的车载设备进行全方位组网,设计统一的组网模式以降低组网成本;在Y市进行了实际部署,通过对Y市信号覆盖的全方位测试,最终以最少部署设备实现了Y市的最大范围覆盖。更多还原

【Abstract】 With the continuous development of science and the constant improvement of informationalized life,the needs of video transmission technology in daily life as well as in the work are growing,and practical scenes of video transmission are becoming wider.The initial video transmission was mainly through cable network,but it got lost where there was not covered by cable network.In order to solve the above problem,the public wireless network can be applied to make transmission.When major events and natural disasters take place,the public network occupancy rate reaches the peak.Thus,a self-built wireless network becomes the best solution for the multitudinous industry businesses and the public sectors to transmit videos.Wireless MESH network,as a typical wireless multi-hops network,combines the advantages of wireless local area network(LAN)and Ad Hoc network at the same time,such as relatively simple deployment and installation,good stability,relatively flexible structure,and convenience to obtain high bandwidth etc.Therefore,application of the wireless MESH network to wireless video transmission can meet the basic needs of video transmission and significantly reduce the investment of network deployment as well.Firstly,this paper introduces the development process and current situation of audio and video transmission technology and the development history and technological advantages of wireless MESH network.Secondly,a network scheme was carried on the design and research in three aspects respectively from the on-board wireless figure transmitting MESH networking,individual figure and mobile wireless MESH network,as well as audio and video integrated mobile MESH network,and was applied to the actual testing and implementation of the project to achieve a stable and efficient video transmission.Video transmission achieved a higher rate in order to improve the video articulation through parameter adjustment on the premise of guarantee smooth video transmission.In particular,a rational network model was designed and then a standard car MESH networking system was built based on the on-board wireless figure in the design of the mobile MESH network,using more than one car MESH networking equipment,through the test of influence of network speed,video bit rate,speed and other important parameters on the wireless signal.Many sets of individual MESH diagram and equipment were applied in individual figure and mobile wireless MESH network design and then a unified model of networking was designed for the similar project network through the design of individual wireless video transmission network model based on the actual testing of the optimal signal and video quality.In order to realize the wireless video transmission covering the whole city,a unified network model was designed to reduce the cost in audio and video integrated mobile MESH network,based on the all-dimensional network of the individual MESH diagram preach equipment,automotive MESH diagram equipment and the on-board equipment placed on the base.The actual deployment was carried out in Y city,and the maximum coverage of Y city was realized with the minimum deployment equipment through the comprehensive test of the signal coverage in Y city.更多还原