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.     

Mobile television receivers: a free-to-air overview - [integrated circuits for communications]

In contrast to mobile television standards such as DVB-H and MediaFLO, the use of existing free-to-air broadcast television in mobile devices is an intriguing concept that has so far garnered little attention. Standards such as DVB-T and analog television broadcast are pervasive worldwide, and their use in mobile applications circumvents many of the deployment challenges facing DVB-H and the like. However, there are severe technical challenges in doing so: mobility, power consumption, antenna performance, and mixer harmonic rejection are just a few of the issues facing the use of free-to-air broadcast in mobile devices. In this article we address these issues, with particular focus on DVB-T digital and NTSC/PAL/SECAM analog broadcast standards.     

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     

实现手机电视的技术方式

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发展历史,比较基于手机的流媒体业务、MBMS、DVB-H、MediaFLO和DVB-S不同调制方式的数字电视技术的优缺点,并分析5种传输系统在不同网络环境中的运行性能。     

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     

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.     

Technology wars or horses for courses?

Mobile television is handicapped by a divergence of standards. Amidst the runners and riders, odds for DMB/DAB-IP and DVB-H has been shortening, as mobile operators place their bets. The comparison of DMB/DAB-IP and DVB-H is discussed in terms of spectrum availability and network cost     

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.     

省级广电IPTV集成播控平台的需求分析

IPTV的主要特点在于其交互能力和实时性,选择IPTV业务,可以让用户得到高品质的数字媒体服务,实现消费者和运营商之间真正的互动。近年来随着IPTV产业的大发展,集成播控平台系统应运而生。该系统采用广电负责播控、电信负责传输的运营模式,各省级广电机构完成内容播出的控制和管理功能,具体负责节目管理、授权控制、费用收取、用户管理等工作。该项目是我国三网融合内容播控完整结构的组成部分,是各省级地区唯一的IPTV内容集成播控平台。它上方连接国家IPTV中央集成播控总平台,在本省区域内融合各级媒体单位与其他内容提供商,下方连接中国电信各省级公司IPTV内容分发平台和传输网络,提供带有本省特点的直播、轮播、点播等视频节目内容与网络服务。     

基于DVB-H的新一代手机电视技术

DVB-H是数字视频广播DVB组织推出的新一代多媒体移动标准,可以为手持设备传送强大的点到多点的多媒体服务。本文对DVB-H标准进行了解析,介绍了基于该标准的新一代手机电视技术,并分析了DVB-H的发展现状,对基于DVB-H的新一代手机电视技术的前景也进行了预测。     

多媒体移动接收与DVB-H的发展

DVB-H是数字视频广播(DVB)组织为通过地面数字广播网络向便携/手持终端提供移动多媒体业务所制订的最新标准.本文分析并介绍了3G、WLAN和DVB-H在多媒体移动接收领域各自的技术特点和最新进展,对未来多媒体移动接收领域的发展提出了自己的观点.     

Content and context for mobile television: Integrating trial,expert and user findings

Mobile television brings together two contemporary social developments: enhanced end-user mobility and new forms of access to media content. DVB-H trial activities worldwide reveal the industry’s belief in broadcast mobile television as ‘the next big thing’. To date however, these trials are mostly technology-driven and tend to overlook the user. As the past has innumerably proven, end-user acceptance and success of new media innovations are highly dependent on content, as the end-user can be considered as rather technology-agnostic. Evidently, content – suited to the consumer’s demands – is assumed to be a main key factor for the success of mobile television.     

基于MBMS的手机电视技术

多媒体广播组播业务(MBMS)是3GPP Release 6版本中引入的一项重大功能,目的在于节省系统资源,为用户提供广播或者组播的分组数据业务.作为一种具体的MBMS应用,手机电视技术在3G业务中占有重要的地位.文中介绍了多媒体广播和组播技术(MBMS),包括MBMS的网络结构、业务流程以及基于TD-SCDMA的MBMS系统架构,对LTE中的E-MBMS技术进行了初步研究,并从逻辑结构、业务模式和信道结构等方面简单分析了从MBMS到E-MBMS的演进.     

DVB-H手机电视标准中的MPE-FEC

DVB-H可以保证移动终端在移动环境和低功耗条件下接收数字电视节目,可以很好地和3G网络配合使用。本文首先阐述了DVB-H的系统解决方案,然后对其中能够提高移动信道中的C/N、多普勒性能以及抗脉冲干扰能力的MPE-FEC技术进行分析,重点介绍了MPE-FEC的帧结构及其传送和RS译码。     

地市级电视台构建快捷新闻直播车的探讨

从自然、社会频繁发生的突发性新闻事件出发,引出了构建快捷新闻直播车的必要性,介绍了移动数字电视技术、标准及快捷新闻直播车的特点、作用,探讨在移动数字电视技术基础上地市级电视台如何构建快捷新闻直播车。     

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。     

广电双向网络中的用户数据加密

广电网络运营商在数字化整体转换后将发展的目光投向数字电视增值业务,随着各地增值业务平台的建成,明文传送的用户数据存在被窃取和篡改的可能,对它的加密受到广电运营商的重视,就现有的用户数据加密手段进行说明,同时对各种加密方式的流程进行设计,为广电网络运营商提供一个切实可行的思路。     

DVB-H系统的最新进展以及面临的竞争

回顾了DVB-H标准的发展历程,介绍了DVB-H系统的技术架构、关键技术、最新进展以及所面临的竞争,并以数字电视广播结合移动通信网络之交互式业务应用为例,说明了未来技术的发展方向.     

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.     

DT1135B AVS+专业解码器在台州广电的应用与实践

1 AVS+的技术优势 AVS是我国具备自主知识产权的信源编码标准[1],包括系统、视频、音频、数字版权管理4个主要技术标准和一致性测试等支撑标准.AVS的主要创新在于提出了一批具体的优化技术,在较低的复杂度下实现了与国际标准相当的技术性能.AVS技术的优势包括:1)性能高,编码效率是MPEG-2的2倍以上,与H.26x的编码效率处于同一水平;2)复杂度低,算法复杂度比H.264明显低,解码器复杂度降低到70％,编码器复杂度降低到30％,软硬件实现成本也都低于H.26x;3)我国掌握主要知识产权,专利授权模式简单,费用低.