用于数字电视地面广播的两种传输系统(ATSC 8-VSB和DVB-T COFDM)的性能比较

比较了用于数字电视地面广播的ATSC8-VSB和DVB-TCOFDM两种传输系统的性能，这种比较是基于最新的实验室测试结果和理论分析。     

DVB-T COFDM和ATSC 8-VSB两种数字电视地面广播传输系统的比较

经过多年的深入研究和开发，我国的数字电视的发展进入了最后的实施阶段。本文从数字电视地面广播的技术出发，介绍关于数字电视地面广播的DVB-T。（数字视频地面广播）COFDM（编码的正交频分复用）和ATSC高级电视制式委员会）8-VSB（8-残留边带调制）两种数字地面发送技术的原理、性能等，并对两种技术各自的优缺点进行了比较，供参考。     

数字电视地面广播COFDM系统传输方案的研究

随着数字化时代的到来，数字电视也相应地得到了快速地发展。本文首先简要介绍了数字电视地面广播、接着在分析正交频分复用（OFDM）技术基本原理的基础上，进一步探讨了以欧洲数字电视地面广播（DVB-T）为基础的COFDM传输方案原理，分析了该方宁所具有的特点。OFDM/COFDM已经在数字音频广播中实现，并准备应用于地面数字电视和HDTV广播中。最后还对我国数字地面电视的发展做了分析与展望。     

基于无线地面广播的数字电视标准DVB-T及COFDM技术

该文阐述了欧洲基于地面广播的数字电视标准(DVB-T),分析了其核心技术COFDM、系统结构及优缺点,同时也介绍了国内外地面广播数字电视的发展状况。     

高清晰度电视中8—VSB与COFDM传输方案的分析比较

本文简要介绍高清晰度电视中８－ＶＳＢ和ＣＯＦＤＭ传输方案及其基本原理，并针对传信率为１／Ｔ＝２３．５４８Ｍｂｐｓ的８－ＶＳＢ生ＣＯＦＤＭ作了计算机模拟，最后对该两种传输系统作了结构和性能上的比较分析。     

HDTV地面广播传输中的多载波(OFDM/COFDM)调制方案

介绍了在QPSK—OFDM传输试验中，在DTT中采用OFDM，对移动信源不必采用跟踪的定向天线，取而代之的是非定向天线和较少的接收基站就可以在多径环境中取得优良的性能。OFDM调制方案可以改善移动信源电视广播传播的操作，并在大规模传播中简化中继网络。     

ATSC与DVB-T数字电视地面广播特性比较

我国的数字电视的发展已经取得了长足的进步，如何制定一个适合我国国情的数字电视地面广播的标准，仍需要广播工作者继续努力。本文介绍了ATSC 8－VSB和DVB－T COFDM两种数字地面发送系统在系统的C／N性能、频谱效率、噪声性能和干扰性能等方面的比较结果，两种系统各有优缺点，供大家参考。     

数字视频广播COFDM系统传输方案

本文在分析正交频分复用（OFDM）技术基本原理的基础上，进一步探讨分析了以欧洲数字视频地面广播（DVB－T）为基础的COFDM传输方案原理，指出该方案所具有的特点，为我国自行研制高清晰度数字电视地面广播提供了很有意义的参考。     

数字电视地面传输标准ISDB-T系统传输方案

对日本数字广播专家组制定的数字电视地面传输标准ISDB-T系统传输方案进行了描述,首先简要介绍了系统的传输方式及系统参数,然后给出了信道编码、调制方式以及接收机部分的具体结构.同时,由于ISDB-T和DVB-T系统均采用OFDM调制技术,所以对两者进行了比较.     

有器件非线性时VSB和COFDM系统性能比较

本文对ＶＳＢ和ＣＯＦＤＭ数字传输系统的性能进行了理论分析和模拟，结果证明从线性系统角度考虑，这两种传输系统在性能上是等价的。本文还就这两种系统对器件非线性的要求进行了分析和模拟，其结果说明ＣＯＦＤＭ系统要求器件具有较小的三阶交调和三阶互调分量，并且，ＣＯＦＤＭ系统峰值－平均功率电平比较大，这将导致ＣＯＦＤＭ接收机中Ａ／Ｄ变换器和数字信号处理位数大于１２比特。     

ATSC 8-VSB和DVB-T COFDM一般传输系统之间的性能比较

一般来说,每个系统都具有自己独特的优势和劣势.ATSC 8-VSB系统在加性白高斯噪声(AWGN)信道方面有较强的能力,具有较高的频谱效率和较低的峰值-平均功率比,并且抗脉冲噪声和相位噪声的能力较强.它在低电平总回波(鬼影)效果及模拟电视对数字电视的干扰方面与DVB-T性能类似.因此,ATSC 8-VSB系统对于多频网络(MFN)实施和在6 MHz信道内提供HDTV服务方面可能具有较大的优势.     

数字电视地面传输系统中的OFDM/COFDM技术

比较详细地介绍了OFDM/COFDM的基本理论、性能及其系统的实现，OFD/COFDM已经在数字音频广播中实现，并准备应用于地面数字电视和HDTV广播中。     

DVB-T: the COFDM-based system for terrestrial television

In early 1996, the European DVB (Digital Video Broadcasting) Project finalised what is now called the `common 2k/8k specification' for terrestrial television transmission. This specification is an important cornerstone of digital video broadcasting in Europe and numerous other countries in the world. Called DVB-T, it is based on the channel-coding algorithms the DVB Project had earlier devised for digital television on cable and satellite. The modulation scheme that is used for DVB-T is OFDM (orthogonal frequency division multiplexing), which when used in conjunction with channel coding is known as COFDM. Two variants are described, one employing 1705 individual carriers in an 8 MHz channel (`2k variant'), the other employing 6817 carriers (`8k variant'). Each individual carrier can be modulated either by QPSK, 16-QAM, 64-QAM or hierarchical modulation     

Enhanced-xVSB system development for improving ATSC terrestrial DTV transmission standard

This paper describes advanced dual stream system for improving mobile/pedestrian reception performance to the ATSC DTV 8-VSB transmission standard. E-xVSB system can transmit a mixture of normal (8-VSB) stream and enhanced (robust) stream. The robust stream has a higher threshold of visibility (TOV) compared to the standard stream, and legacy receivers ignore the robust packets. Thus, Enhanced-xVSB system is fully backward compatible with a current ATSC standard. For more robust transmission support, E-xVSB system adopts a reduced constellation method as well as enhanced trellis-coded modulation scheme. E-xVSB system supports a variety of enhanced modulation schemes: Pseudo-2VSB, Enhanced-4VSB, modified Enhanced-8VSB and Hybrid-VSB. Proposed system has been tested in the Lab, and the testing results are shown in this paper.     

Digital terrestrial television (COFDM 8K system) field trials andcoverage measurements in Spain

This article presents the results of the first digital terrestrial television field trials and coverage measurements in Spain. First of all the VIDITER project is presented. The main objective of this work is to study the behavior of a whole digital terrestrial television network, from source coding up to the final signal reception. At this point, the experimental network installed in Madrid is described. Next, the measurement campaign is explained, first, by describing the network configuration used for these first field trials, and then, paying attention to the criteria used to select the measurement points and the parameter set to be tested. Some of the results obtained are shown as a first approach to the figures needed to develop and plan a fully operational digital terrestrial television service     

ATSC 8-VSB调制器的一种数字化实现方式

近些年来,高清晰度电视技术引起了世界的广泛关注.本文介绍了一种用数字方式实现美国数字电视地面广播系统中的8-VSB调制器的方法.提出了系统的总体要求,并且分析了系统的数学原理.详细的阐述了系统的硬件设计,逻辑仿真和实现.     

地面数字电视传输技术8-VSB和DVB-T OFDM

介绍8-VSB系统和DVB-T OFDM系统的标准和原理，并对它们的性能进行比较，提出这两种技术抗地现多径干扰的措施。     

ATSC标准中8-VSB调制器的算法改进及FPGA设计实现

重点介绍了ATSC标准的8-VSB系统构架以及FPGA系统的具体实现方案.根据具体标准的参数要求,分析了ATSC标准.基于改进的维弗法,提出了频率范围可变的低中频数字信号输出解决方案,给出了系统硬件的设计步骤,并给出实测结果.     

Canadian digital terrestrial television system technical parameters

On November 8, 1997, Canada formally adopted the ATSC Digital Television Standard for terrestrial transmission as defined in document A/53 of the Advanced Television Systems Committee of the USA and as modified by the FCC document MM Docket No. 87-268. This paper discusses the Canadian digital terrestrial television system technical parameters for implementation and frequency planning: interference protection ratios, reference system parameters, and radio frequency emission masks, as well as their design methodology. First, the Canadian terrestrial DTV design guidelines are presented, followed by the introduction of DTV reference receiving system set up and the parameter selection of the interference protection ratios. Last, the design methodology of the emission masks is discussed