数字电视多媒体移动标准DVB-H浅析

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.对DVB-H系统的构成、关键新技术、技术的试验情况及技术专利情况进行了分析.     

手机电视发展趋势探讨

首先对三种数字广播技术——DVB-H、DAB／DMB和ISDB-T的发展进行了介绍，接着分析了应用广播技术的手机电视的国内外市场情况，最后对广播技术与蜂窝网络的融合这一手机电视的发展造势进行了探讨。     

全球手机电视技术及业务进展分析

手机电视业务的技术实现方式包括：基于蜂窝网络的流媒体技术和蜂窝广播技术：基于地面广播电视网络的DVB-H技术、ISDB-T技术、T-DMB技术和FLO技术;以及利用卫星网络实现的S-DMB技术等.综合比较发现,地面数字广播在技术先进性、成熟度、政策环境等方面占据一定优势,其中又以DVB-H技术更有前景.     

DVB-T标准与DVB-H标准技术分析

数字电视地面广播（DVB-T）标准已广泛应用于数字电视广播的固定与移动接收系统。随着手持移动电视业务的发展,在DVB-T标准的基础上扩展成为手持数字电视广播（DVB-H）标准。本文介绍了DVB-T标准的关键技术以及DVB-H标准在DVB-T基础上增加的技术。     

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.     

DVB-H系统的关键技术及发展趋势

介绍了手持数字视频广播(DVB-H)的系统结构、网络构架和发展现状,详细讨论了DVB-H系统中的时间分片、多协议封装前向纠错、深度符号交织和无缝业务切换机制等关键技术,从系统参数、建网成本及商用进程等多个角度对DVB-H、地面数字多媒体广播(T-DMB)和MediaFLO三大手机电视地面传输制式进行了分析比较,最后以数字电视广播结合移动通信网络的交互式业务应用为例阐述了未来技术的发展方向。     

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。     

基于广播网的手机电视技术分析及其应用进展

手机电视的实现技术包括基于蜂窝网的流媒体技术和蜂窝广播技术，基于地面广播网的DVB-H、T-DMB、MediaFLO、ISDB-T、DAB-IP等多种技术和基于卫星广播网的S-DMB技术。蜂窝广播技术包括对应于WCDMA和cdma2000系统的MBMS和BCMCS，从目前发展情况来看，这两项技术还没有成熟。     

基于广播网的手机电视技术分析及其应用进展

手机电视的实现技术包括基于蜂窝网的流媒体技术和蜂窝广播技术，基于地面广播网的DVB-H、T-DMB、Media FLO、ISDB-T、DAB-IP等多种技术和基于卫星广播网的S-DMB技术。蜂窝广播技术包括对应于WCDMA和cdma2000系统的MBMS和BCMCS，从目前发展情况来看，这两项技术还没有成熟。[第一段]     

数字移动多媒体标准DVB-SH浅析

DVB-SH是数字视频广播(DVB)组织最新推出的基于卫星/地面混合数字广播网络的移动多媒体业务平台,主要面向便携/手持终端,是DVB-H标准的重要补充.文中对DVB-SH系统的基本构成、关键技术、技术的实验情况进行了分析.     

An efficient approach for DVB-H handover in DVB-H/UMTS hybrid networks

Handover in Digital Video Broadcasting for Handhelds （DVB-H） aims to provide continuous mobile broadcasting services when a user is traveling through cell boundaries. A good handover control can improve the power efficiency and gain much better reception quality. This letter provides a novel approach for DVB-H handover based on DVB-H/Universal Mobile Telecommunications System （UMTS） hybrid network, which moves the main handover function from the terminals to the networks, so that it reduces the operation complexity of the terminals and increases the power saving. When the terminal can not receive the DVB-H signal in the transmission shadow areas or because of some other reasons, the UMTS networks may offer the same service to users to make the service continuous. As the UMTS networks have the topology of the DVB-H networks, by communicating with the terminals, the UMTS networks can help the terminals to predict the handover, and avoid unnecessary handover.     

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.     

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.     

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.     

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     

Transmitter Identification With Watermark Signal in DVB-H Signal Frequency Network

Transmitter identification (TxID) technique is used to diagnose the operating status of radio transmitters in DTV distributed transmission network. In this paper, a new kind of TxID method for DVB-H SFN(Single Frequency Network)system is proposed. We embed a signal (e.g. watermark) in the DVB-H signal to form the composite signal. The embedded signal will not alternate the system spectral efficiency. By watermarking theory, we demonstrate the required embedded level for watermarking signal to achieve a given bit error probability in different circumstance. Simulation results show that the receiver can distinguish the watermarking signal with low embedding strength even in wireless situation. At that embedding strength, BER performance degradation for the receiver can be ignored.      

Internal antenna with modified monopole type for DVB-H applications

An internal modified monopole antenna for DVB-H band is presented. By extending the feeding line of the modified monopole and locating it over a ground plane, a wideband input impedance of 328 MHz within 6:1 VSWR is achieved. The proposed antenna has an approximately omnidirectional radiation pattern and yields greater than -3 dBi antenna gain covering DVB-H band. These features are suitable for DVB-H applications