发布时间：2015-01-24 来源：人大经济论坛

通信工程专业论文 目 录 1.引言1 1.1 课题的研究背景及选题意义1 1.2 国内外技术现状2 1.3 中国有线数字电视发展趋势3 1.4 论文主要工作与内容安排4 2.数字电视有线传输系统的组成原理5 2.1 数字通信系统的一般组成5 2.2 数字电视有线传输系统组成6 2.2.1 系统框图及概念6 2.2.2 MPEG-2传输复用包的形成7 2.2.3 字节到符号的映射9 2.2.4 QAM调制9 2.2.5 网络系统10 2.3 有线数字电视前端系统10 2.3.1 信号输入部分10 2.3.2 信号处理部分11 2.3.3 信号输出部分11 2.3.4 系统管理部分12 2.3.5 数字电视前端的调试12 3.数字电视有线传输技术基础13 3.1数字电视有线传输主流标准与方式13 3.2 差错控制技术13 3.2.1 能量扩散14 3.2.2 RS编码14 3.2.3 卷积交织15 3.2.4 格状编码(TCM)15 3.2.5 数字差错控制编码在数字电视有线传输中的应用16 3.3调制技术16 3.3.1 MVSB调制16 3.3.2 MQAM调制17 3.4数字电视有线传输系统主要性能参数18 3.4.1 脉冲编码调制信号的带宽18 3.4.2 视频信噪比19 3.4.3 误码率19 3.4.4 抖动功能19 3.4.5 可靠性与可用性20 4. DVB系统的System View仿真21 4.1 System View仿真系统简介21 4.2 QAM调制解调模块的仿真21 4.2.l、QAM仿真模块的组成22 4.2.2 参数设置22 4.2.3 仿真结果及分析23 4.3 RS编译码模块的仿真26 4.3.1 仿真原理图26 4.3.2 参数设置26 4.3.3 仿真结果及分析27 4.4 交织编译码模块的仿真28 4.4.1 仿真原理图28 4.4.2 参数设置29 4.4.3 仿真结果及分析29 总结与展望31 谢辞32 参考文献33 摘 要 当前科学技术日新月异, 随着信息产业建设的加速, 数字技术已广泛地进入人类生活的许多领域, 数字化浪潮正以磅礴之势席卷全球, 使我们从工业社会迈向信息社会, 数字电视也就应运而生, 即将进入千家万户。 我国目前城镇居民收看电视的主要接入方式就是有线电视。它拥有庞大的用户群体，相对于卫星传输和地面传输来说有更广大的发展前景。有线电视网具有频带宽、信息量大、传输质量高、覆盖面广、用户多等优势, 随着数字技术、网络技术的发展, 更显其网络资源蕴藏的价值。数字电视无疑是广电未来最有发展前途的业务, 将给广电带来新的业务增长点,并将推动了国家信息产业和民族工业的发展。因此，数字电视有线传输系统的研究，对我国的数字有线电视传输标准的制定和取得有中国自主权的数字电视传输标准具有重要意义。 本文利用System View对DVB-C的系统组成、传输技术、传输技术的标准作了简单介绍，对QAM调制解调、RS编解码，交织编译码进行仿真，并对结果进行分析，对DVB-C系统的性能进行了评估。 关键字: DVB-C；QAM；RS编解码器 Based on SystemView digital television wired transmission system simulation design Abstract Current science and technology changes with each new day, along with the information industries construction acceleration,the digital technology widely entered many domains which the humanity lives, the digitized tide by the boundless potential is engulfing the entire world, causes us from the industry society to advance to the information society, the digital television also arises at the historic moment, soon enters everyone. Our country the cities inhabitant watches the television at present the main turning on way is the cable TV. It has the huge user community, is opposite has the more general prospects for development in the satellite transmission and the ground transmission. The wired television network has the band width, the information content in a big way, the transmission quality high, the coverage broad, the user many and so on the superiority, along with the digital technology, the networking development, reveals its network resources implication the value. The digital television will be without doubt Guang Dian future most has the development future service, will give the broad electricity to bring the new service point of growth, and impelled the country information industries and the national industry development therefore, the digital television wired transmission system research, and will obtain to our country's digital cable TV transmission standard formulation has the Chinese right to independence digital television transmission standard to have the vital significance. This article used System View to the DVB-C system composition, the transmission technology, the transmission technology standard has made the simple introduction, to the QAM modulation demodulation, RS arranged the decoding, interwove arranges the decoding to carry on the simulation, and carried on the analysis to the result, has carried on the appraisal to the DVB-C system performance. Key words: DVB-C；QAM；RS arranges the decoding