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。     

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。     

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。     

新一代多媒体移动标准-DVB-H

DVB-H是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 DVB-H系统依托DVB-T传输系统,通过增加一定的附加功能和改进技术使手持终端能够稳定地接收广播电视信号 DVB-H可以保证移动终端在移动环境和微功耗条件下接收数字电视节目,从而很好地配合3G网络的应用 数字电视地面广播标准DVB-T于1997年发布.     

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。     

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     

LG HB620T

在手机上收看数字电视节目无疑是很多人的乐趣,但基于DVB-H标准的手机移动电视功能目前尚不普及。而这次LG独辟蹊径地推出的这款电视手机则支持的是DVB-T(数字电视地面广播)标准,借助这个在欧洲相当常见的移动数字电视标准.真正满足了人们随时随地收看精彩电视节目的愿望。不仅如此,为了提供更好的收视效     

诺基亚将公开移动电视规格“DVB-H”空中接口标准

芬兰诺基亚目前宣布．将向大众公开该公司针对移动地面数字电视规格“DVB-H”而开发的接收系统用空中接口标准。这里所讲的空中接口标准就是指有关支持DVB-H规格的手机是如何确立与转播网络进行互连的详细文档。便于确保支持DVB-H规格的发送设备与接收终端之间的互联特性。对于旨在推进DVB-H规格的诺基亚来说．其目的在于完善通信环境，以便电视台和内容提供商能够迅速地提供符合此规格的转播服务。     

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。     

浅谈移动电视DVB-H标准及其核心技术OFDM

地面数字电视广播系统目前有多种标准,这些制式总体上可以分为单载波方式和多载波方式两类,美国用的ATSC是单载波的,欧洲的DVB-T是多载波的。在欧洲,针对DVB-T(DigitalvideobroadcastingTerrestrial)在移动接收中的不足,人们提出了一种DVB-H的标准专门用于移动接收。本文对移动电视DVB-H标准及其核心技术OFDM进行了介绍和分析。     

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.     

DVB-T/H and T-DMB: Physical Layer Performance Comparison in Fast Mobile Channels

Terrestrial or Handheld Digital Video Broadcasting (DVB-T/H) and Terrestrial Digital Multimedia Broadcasting (T-DMB) are two popular broadcasting standards that enable digital television transmissions to handheld receivers. This paper presents a comprehensive performance comparison between the physical layers of DVB-T/H and T-DMB when employed for mobile communications. By exploiting a recently proposed fast simulation model, we assess the BER of the two coded OFDM systems in several realistic scenarios, taking into account Rayleigh and Rice channels, different mobile speeds, inner and outer channel coding, channel estimation, and one or two receive antennas. Our comparison shows that the DVB-T/H physical layer performance highly depends on the delay spread of the channel, whereas T-DMB is less sensitive to the frequency selectivity of the channel. As a result, DVB-T/H yields better performance than T-DMB in typical Rayleigh channels with significant delay spread. On the contrary, at high SNR, T-DMB outperforms DVB-T/H in Rice channels with low delay spread. As a side result, we show the performance improvement of DVB-H produced by MPE-FEC at the data link layer.      

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     

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.     

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.     

移动电视技术应用解析

目前移动电视的主要技术标准有S/T-DMB、DVB-H、MediaFLO、ISDB-T,从无线信道特性、频谱问题、编解码技术、接收终端方案及实际应用状况等方面分析了移动电视技术。     

国际手机电视技术现状研究综述

介绍了手机电视技术特点,并比较了3种实现方法.重点阐述了多媒体广播组播业务,DVB-H,T-DMB,S-DMB等技术方案.最后,分析了手机电视技术所面临的一些问题.     

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.     

The small screen [TV to mobile devices]

Television is likely to start being broadcast to PDAs and mobile phones soon, with the help of shrinking screen technologies. With 3G take-up going far slower than operators hoped and the pioneering service in the UK struggling to achieve initial sales targets, stakeholders from network operators to content providers are looking at more reliable ways of generating money in a saturated handset market. Adding broadcast television functionality to mobile devices, whether they are phones or personal digital assistants, could be the answer. Getting a 100 second video clip to a million mobile subscribers at 100 kbps could occupy an entire 3G network for up to 15 minutes, while the same content could be delivered by the broadcast route using only around 0.1% of capacity. A new standard, DVB-H, will address issues like power saving. Impatient broadcasters may use existing platforms to deliver services rather than waiting for DVB-H. This raises the prospect of a digital audio standard, like DAB, being used to deliver television to a mobile phone. The article outlines some of the research being carried out.