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1.
INTRODUCTION Ad-hoc networks are attractive owing to their self-organizing nature and absence of a fixed infra- structure. They are particularly suited for communi- cation in disaster-affected areas, coordinating military operations, and sensing environmental conditions With the growing availability of supporting hardware and decreasing equipment cost, ad-hoc networking based applications are proliferating. Meshes of wire- less nodes are being deployed in cities and housing communities to…  相似文献   

2.
Error resilient concurrent video streaming over wireless mesh networks   总被引:3,自引:0,他引:3  
INTRODUCTION Wireless mesh networks (WMNs) are ad-hoc networks with full or partial mesh topologies, where nodes can automatically establish and maintain mesh connectivity among themselves. Such a mesh topol- ogy provides each node multiple communication paths to reach its peers. In the presence of link failures caused by, for example, node failures or interference, information can be rerouted through alternative paths to the destination. WMNs have no fixed infrastructure and are easily…  相似文献   

3.
INTRODUCTION Video streaming service nowadays enjoys ex- plosive adoptions over all kinds of underlying net- works. To enjoy the freedom of tether-less connection over the wireless local area network (WLAN), we need to overcome many challenges of unstable wire- less channel due to fading, interference and so on. The scarce and fluctuating available bandwidth (together with time-varying delays and random/burst losses) can cause the video quality at the streaming client to be seriously deg…  相似文献   

4.
INTRODUCTION With the emergence of wireless technology, various multimedia services, e.g., audio and/or video, are reaching us today through portable devices any- time, anywhere and even more increasingly accessi- ble in the near future. High quality video streaming over wireless IP is one of the most attractive applica- tions by ongoing deployment of wireless local area network (WLAN) hotspots and even powerful Wi- MAX mobile coverage. However, the present Internet is not providing a…  相似文献   

5.
INTRODUCTION According to yearly statistics the demand for multimedia traffic over computer networks is con- stantly on the increase (Nielsen//NetRatings, http:// www.nielsen-netratings.com/). Therefore, it is inevi- table that situations where different media streams will need to share communication resources will be- come commonplace. In such cases, it would be of interest to optimize the overall performance of the network. In other words, resources should be allo- cated across the com…  相似文献   

6.
INTRODUCTION Video streaming is becoming one of the major driving forces of next generation wireless networks. For the currently deployed cellular networks, the practical data rates are not enough to support full rate, high quality video applications. As a result, many research efforts have been devoted to adapting video content to reconcile the conflict between the high demand of video quality and the limited wireless communication resources among users. A large body of literature utiliz…  相似文献   

7.
流媒体作为一种新型媒体,采用流式传输技术,解决了网络课程中视频资源的传输问题。在分析流媒体技术优势的基础上,结合本校网站设计与制作网络课程视频资源库,重点探讨流媒体资源库的平台构建、文件管理及其应用。  相似文献   

8.
视频信息的网络化传输及呈现   总被引:2,自引:0,他引:2  
介绍了数字时代教育电视系统发展的典型代表:视频信息的网络化传输及呈现,并构建了基于流媒体技术的视频信息网络化传输及呈现系统,针对该系统面临的主要问题给出了应对策略。  相似文献   

9.
流媒体技术是互联网中视音频传输的核心技术,为远程网络教育提供了重要的技术支撑。本文分析了传统网络教学的现状及Real流媒体技术的相关知识,并从若干个方面探讨了在远程网络教学中Real流媒体技术的应用。  相似文献   

10.
一种新的无线视频传输帧内刷新策略   总被引:1,自引:0,他引:1  
首先分析了无线信道突发性出错和二阶Markov无线信道模型. 根据该模型和视频编码器的编码方式推导了突发性出错引起的帧内编码和帧间编码的信道失真. 然后提出了一种新的速率失真率(R-D)框架内的帧内刷新策略. 该策略一方面对无线视频传输系统的容错性能和编码效率进行了优化, 另一方面可有效阻止帧间错误传播, 减小信道失真. 在不同传输信道中的仿真结果验证了该策略在无线视频传输容错方面的性能改进.  相似文献   

11.
流媒体技术在远程教育中的运用   总被引:7,自引:1,他引:7  
流媒体技术是为解决远程教育中多媒体信息传输问题而产生、发展起来的一种网络新技术。本文简要介绍了现代远程教育存在的问题及产生原因、流媒体概述、流媒体与远程教育的完美结合,并介绍了流媒体发展中遇到的问题及解决办法  相似文献   

12.
INTRODUCTION Multimedia services over the Internet are be- coming popular due to the widespread deployment of broadband access. However, the conventional cli- ent-server architecture severely limits the number of simultaneous users, especially for bandwidth inten- sive applications such as video streaming. P2P net- works, on the other hand, offer a solution to the scalability problem. As a node joins a P2P network, it not only consumes resources but also contributes its bandwidth or comp…  相似文献   

13.
探讨了如何利用流媒体技术、卫星接收技术及现有电脑网络软硬件资源,实现卫星视频教学资源在城域网内的有效传输、分享和集中管理,解决在“农村中小学现代远程教育工程”实施过程中,教育资源分配不均衡、资源和设备管理难、专业信息人员缺乏等问题,提高了教育信息化水平.  相似文献   

14.
杨涛 《教育技术导刊》2020,19(5):181-185
科技信息视频资源是科技情报信息资源不可或缺的重要组成部分。为解决馆藏科技信息视频资源管理不便与利用率不高的问题,按照已建立的资源数字化加工标准要求,对馆藏视频资源进行统一处理,并基于流媒体技术,采用 FMS 流媒体服务器,结合 Flashplayer 在线流媒体开发模式,设计开发了一套 B/S 模式的馆藏科技信息视频资源在线播放数据库系统。该数据库系统投入运行后,馆藏视频资源管理费用降低了约 80%,管理效率提升了约 60%,且视频资源利用率是过去的近 20 倍。同时,也进一步提升了单位科技信息服务质量和影响力。  相似文献   

15.
INTRODUCTION Many applications, such as software distribution, Internet TV/video streaming, video conferencing, multiplayer gaming, personal media distribution and P2P web content duplication, distribute the same content from one source node to many destination nodes. For these applications, IP multicast is an ideal network layer solution. A distribution tree rooted at the source can be formed to reach an arbitrary number of receivers. During content distribution, every single piece of…  相似文献   

16.
随着信息社会的快速发展,流媒体技术在互联网媒体传播方面起到了主导的作用,其中视频点播、远程教育、视频会议I、nternet直播、网上新闻发布和网络广告等方面的应用空前广泛,方便了人们全球范围内的信息和情感交流.如今要讨论的是流媒体技术在校园网上的应用.  相似文献   

17.
传统流媒体平台对服务器性能,网络带宽等条件要求较高,对校园网的视频应用服务有一定的局限性。为解决此问题,设计了一种基于P2P架构的流媒体视频教学平台,将流媒体技术的实时性和P2P网络的分布性完美地结合起来,实现了视频直播和点播功能。  相似文献   

18.
无线多跳网络信道受到码间干扰容易产生信道分配失衡,为了提高无线多跳网络信道均衡性,提出基于判决反馈均衡的无线多跳网络信道分配优化算法,构建无线多跳网络信道模型,采用判决反馈均衡器进行无线多跳网络信道分配过程中的干扰抑制和多径补偿,根据信道多径扩展覆盖的码元数进行网络信道分配过程中的前馈滤波调制,利用直接序列扩频方法进行无线多跳网络信道的线性均衡配置,采用自适应的梯度学习算法实现信道分配均衡设计,基于判决反馈均衡技术实现无线多跳网络信道分配优化。仿真结果表明,采用该方法进行无线多跳网络信道分配的均衡性较好,抗多径干扰能力较强,提高了无线多跳网络的通信质量,降低了输出误比特率。  相似文献   

19.
现代教育技术中,网络多媒体教学以及远程多媒体教学正在发挥着越来越大的作用,但是由于网络带宽的限制,如想迅速推广这些教育技术必须要有大量的资金进行网络基础设施的建设,流式媒体技术的出现恰恰解决了这一矛盾。流式媒体使得音、视频的传输更为流畅,并且节省了网络带宽,此项技术被广泛应用于远程教育、网络电台、视频点播、收费播放等系统中。  相似文献   

20.
随着3G网络移动数据业务的发展,特别是网络传输质量和带宽的提升,为移动流媒体业务的发展提供了强大的技术保障.本文主要描述了移动流媒体业务在对连续的视频和音频信息经过编码处理后,经流媒体服务器,由移动终端通过移动网络来在线播放或下载后播放的过程.  相似文献   

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