基于E语言的数字电视DVB-H系统数据链路层功能验证研究

随着数字电视的迅速发展和移动多媒体设备——手机,PDA等的普及,新的技术被发展并应用于手持设备数字电视的接收,DVB-H手机电视标准提供了很好的手机电视接收解决方案。该标准是DVB-T的扩展应用,在数据链路层实现了时间分片、多协议封装和前向纠错功能,从而降低了平均功耗,增强了移动接收的鲁棒性。提出了基于E语言的DVB-H系统数据链路层的功能验证环境,并给出了具体验证步骤和结果分析,最后通过验证分析完善和改进了DVB-H数据链路层系统功能,此外对基于E语言的验证方法进行了一定的研究。     

DVB-H移动数字电视手机设计及其测试方案

本文提出了一种DVB-H移动数字电视GSM/GPRS手机方案及移动电视的测试方案。本文论述了移动数字电视手机系统中各个分系统的组成及各分系统之间的连接。最后论述了DVB-H的工作验证方案和性能验证方案。     

通过卫星高效分发DVB-H以及DVB-T网络服务

DVB-H（针对手持设备的数字视频广播）是DVB项目最新发布的技术标准之一，其目标是直接向电池供电的手持设备提供数字电视服务，如手机、掌上电脑等。基于成熟的DVB-T（地面数字视频广播）技术，具备高质量、可靠移动接收以及提供节电功能的DVB-H技术能够确保类似手机等手持设备也能够获得极高质量的数字视频服务。     

新闻

诺基亚演示手机电视 芬兰诺基亚日前在新加坡举行的“NOkia Connection 2004” 上现场演示了可以收视电视节目的电视手机规格“DVB-H”。这是诺基亚在太平洋地区的首次DVB-H规格演示。DVB-H是在家用电视机的微波数字电视播放方式“DVB-T”的基础     

微软加入移动电视联盟促进DVB-H技术推广

微软日前宣布，公司作为创始成员之一加入了移动数字电视联盟。移动数字电视联盟是一个组建推广向手机播放数字电视节目的DVB-H（手持数字视频广播）技术标准的组织。     

飞利浦推出手机电视解决方案

飞利浦电子公司推出实现手机电视的系统级封装(SIP)。该解决方案基于 DVB-H 标准,将一个完整的数字电视接收器具备的所有功能集成于只有指甲大小的空间中,能帮助消费者在移动中实时接入电视节目、图片、电影以及音乐。为推动手机电视的发展,飞利浦将于2005年第二季度推出小型系统演示板、以支持手机生产商参与下一阶段的 DVB-H 测试。之后还将推出能缩小占板空间和降低功耗的用于 DVB-H 的完整     

手机电视业务的技术分析与研究

手机电视是在手机上收看电视节目的业务.本文阐述了手机电视业务的实现方式、标准、发展、运营模式及存在的问题等方面,提出了相关的建议,并分析了两种主要的数字电视广播标准:DVB-H与MBMS.     

德国为FIFA进行手机电视试验

德国柏林市与邻近的波茨坦市现已启动了名为“Berlin-Potsdam DVB-H Pilot Project”的试验性服务，采用面向手机等便携式终端的微波数字电视广播标准“DVB-H（Digital Video Broadcasting-Handheld）”。     

科技动态

无线宽带的实际应用成为关注重点，支持DVB-H的便携终端数字电视接收IC发表，首批DMB手机电视面市，手机浏览网页标准将出台     

国外动态

新宽带无线技术xMax问世；亚洲卫星公司计划购买AsiaSat5卫星；新闻集团增长偏重互联网；2006年日本向手机用户提供数字电视服务；欧洲DVB-H手机电视在2008年前将大发展。     

数字电视技术分析

DVB—H手机电视技术从传统的数字电视技术演进而来并广泛应用于3G移动通信中，回顾数字电视技术的历史，比较ATSC 8-VSB、DVB—T COFDM和ISDB—T BST—OFDM3种不同调制方式的数字电视技术的优缺点，并分析3种传输系统在不同网络环境中的运行性能。     

移动数字电视接收与DVB-H

从接收端的角度出发分析了DVB-H标准在功耗、移动性和服务质量方面的技术改进,并介绍了DVB-H最新进展,对未来移动数字电视的发展提出了自己的观点.     

Affordable Mobile TV Services in Hybrid Cellular and DVB-H Systems

Mobile TV services are expected to become a key application in future wireless networks. The recently proposed terrestrial digital broadcast technology, DVB-H, especially designed for mobile services, is regarded as a powerful alternative to the 3G cellular networks that already offer these services out on a point-to-point basis. Unfortunately, the cost of supporting real-time streaming and full area coverage seems to be very high compared to fixed TV services. In this article we discuss hybrid IP datacast DVB-H and 3G systems as a possible solution for providing affordable network infrastructure and services. Our approach is DVB-H centric. The 3G cellular system plays the role of providing interactivity, error reporting, and repair for the DVB-H broadcast channel. To enable an easy and efficient interworking of DVB-H and 3G, we employ forward error correction at the application layer with digital fountain coding. The main way to provide lower cost services is to avoid full DVB-H area coverage from the beginning and to perform an incremental DVB-H network deployment that follows the user demand. In this direction, to hide the discontinuity in coverage from the perception of users, we propose to take advantage of the bursty character of DVB-H transmissions and the mobility of users. This is possible by sending additional parity data, either with the DVB-H or the cellular network, in the time intervals between original service bursts. We evaluate the potential DVB-H infrastructure cost savings determined by transmitting additional parity data in DVB-H when targeting vehicular users. The implications of delivering parity data through the cellular network also are discussed. The numerical investigations show a potential for significant cost savings compared with the traditional approaches     

手机电视技术分析与比较

针对手机接收数字电视信号这一业务要求提出多种解决方案,并分别对欧洲数字视频广播、日本地面数字广播、卫星广播及3GPPR6版本提出的多媒体广播、组播业务进行了详细介绍与分析,着重阐述各种技术的优缺点,同时以表格形式比较了几种主要的手机电视承载技术,为网络运营选择组网技术提供参考.     

The DVB-H Mobile Broadcast Standard

The digital video broadcasting-handheld (DVB-H) standard is one of the latest transmission standards developed by the digital video broadcasting (DVB) Project. DVB-H, which is based on the standard for digital terrestrial television (DVB-T), offers mobile television and other broadcasting services on small portable devices such as mobile phones. This article presents an overview of the DVB-H standard with respect to structure, features, technology, performance, and resources.     

基于地面广播的手机电视

手机电视业务可以利用蜂窝移动网络和地面/卫星数字广播来实现,其相关技术有4种:基于移动网实现技术、基于地面数字广播网实现技术、基于卫星实现技术和基于应用层实现技术。DVB-H和T-DMB是2种典型的地面数字广播电视标准,前者是DVB组织为通过地面数字广播网络向手持终端提供多媒体业务所制订的传输标准,后者是韩国推出的基于欧洲厂商开发的尤里卡147数字音频广播(Eureka-147DAB)的地面数字多媒体广播标准。目前开展手机电视业务面临着标准、频率资源、管制和终端等方面的问题,其运营模式存在移动运营商单独运营、广电单独运营和两者合作运营模式3种。手机电视是广电和通信产业融合的重要尝试,主管部门的协调和技术标准的制订将直接影响未来三网融合的进程。     

DVB-H: Digital Broadcast Services to Handheld Devices

This paper gives a brief review of the new Digital Video Broadcasting-Handheld(DVB-H) standard. This is based on the earlier standard DVB-T, which is used for terrestrial digital TV broadcasting. The new extension brings features that make it possible to receive digital video broadcast type services in handheld, mobile terminals. The paper discusses the key technology elements-4K mode and in-depth interleavers, time slicing and additional forward error correction-in some detail. It also gives extensive range of performance results based on laboratory measurements and real field tests. Finally it presents viewpoints relevant for DVB-H network design and system use in general.     

Diversity Gain for DVB-H by Using Transmitter/Receiver Cyclic Delay Diversity

The objective of this paper is to investigate different diversity techniques for broadcast networks that will minimize the complexity and improve received SNR of broadcast systems. Resultant digital broadcast networks would require fewer transmitter sites and thus be more cost-effective and have less environmental impact. The techniques can be applied to DVB-T, DVB-H and DAB systems that use Orthogonal Frequency Division Multiplexing (OFDM). These are key radio broadcast network technologies, which are expected to complement emerging technologies such as WiMAX and future 4G networks for delivery of broadband content. Transmitter and receiver diversity technologies can increase the frequency and time selectivity of the resulting channel transfer function at the receiver. Diversity exploits the statistical nature of fading due to multipath and reduces the likelihood of deep fading by providing a diversity of transmission signals. Multiple signals are transmitted in such a way as to ensure that several signals reach the receiver each with uncorrelated fading. Transmit diversity is more practical than receive diversity due to the difficulty of locating two receive antennas far enough apart in a small mobile device. The schemes examined here comply with existing DVB standards and can be incorporated into existing systems without change. The diversity techniques introduced in this paper are applied to the DVB-H system. Bit error performance investigations were conducted by simulation for different DVB-H and diversity parameters     

T-DMB,DVB-H及MediaFLO的技术对比分析

手机电视三大标准T-DMB,DVB-H和MediaFLO各有千秋.从系统参数、建网成本、用户体验及商用进程多个角度对手机电视地面传输的三大标准进行了对比分析,可供手机电视运营商作为系统选型的参考依据.     

DVB-H中的无缝交互技术

DVB-H作为能通过移动手持设备接收丰富的媒体和电视服务的新型标准,其技术规范及应用越来越受到人们的关注.通过对DVB-H中无缝交互技术的研究,提出了一种新的无缝交互算法,并对该算法进行了评估.