DVB-T解调与调制质量测试系统设计

发布时间：2018-03-26 04:23

本文选题：DVB-T　切入点：解调　出处：《合肥工业大学》2017年硕士论文

【摘要】：近年来,数字电视产业取得了长足的发展,高质量的数字电视传输标准是重要的研究内容之一。作为欧洲研发的地面数字视频传输标准,DVB-T(Digital Video Broadcasting Terrestrial)是当前制式应用最广泛、最灵活的标准之一。然而,地面传输环境对射频信号传输影响巨大,且当前对矢量信号分析测量的设备大多依赖国外进口,相应的测试软件也价格高昂、不易扩展。因此,为科学评估DVB-T信号传输信道环境,计算各项调制质量指标,设计一款DVB-T解调与调制质量测试系统具有十分重要的意义。本文的主要内容如下:(1)阐述了OFDM基本理论基础,解读了DVB-T标准,介绍了DVB-T发射端系统,提出了DVB-T接收端完整的解调设计方案。(2)研究了DVB-T标准解调中主要算法:带宽模式判定算法、模式识别与同步算法和信道估计算法,并提出了一种改进DVB-T信道估计算法,可提高算法精度和降低算法整体复杂度。(3)设计了DVB-T解调与调制质量测试系统,介绍了测试系统的需求分析、总体框架设计,以及采用模块化设计思想的各个模块实现方法。(4)利用相关实验设备选择测试用例进行了DVB-T信号的解调与调制质量测试系统的测试与分析,验证了该解调算法的有效性与测试系统的正确性。
[Abstract]:In recent years, the digital television industry has made great progress, and the high quality digital television transmission standard is one of the important research contents. As a terrestrial digital video transmission standard developed in Europe, DVB-TU Digital Video Broadcasting Tertiary is the most widely used standard at present. One of the most flexible standards. However, the terrestrial transmission environment has a great impact on RF signal transmission, and most of the current equipment for vector signal analysis and measurement depends on foreign imports, and the corresponding test software is expensive and difficult to expand. It is very important to design a DVB-T demodulation and modulation quality test system for evaluating the environment of DVB-T signal transmission channel scientifically and calculating the modulation quality indexes. The main contents of this paper are as follows: 1) the basic theory of OFDM is expounded. This paper interprets the DVB-T standard, introduces the DVB-T transmitter system, and puts forward the complete demodulation design scheme of the DVB-T receiver. It studies the main algorithms of the DVB-T standard demodulation: the bandwidth pattern decision algorithm, the pattern recognition and synchronization algorithm and the channel estimation algorithm. An improved DVB-T channel estimation algorithm is proposed, which can improve the accuracy of the algorithm and reduce the overall complexity of the algorithm. The DVB-T demodulation and modulation quality testing system is designed. The requirement analysis and the overall framework design of the test system are introduced. And the realization method of each module using modularization design. 4) the test cases of DVB-T signal demodulation and modulation quality testing system are tested and analyzed by using the relevant experimental equipment, the test case is selected, and the demodulation and modulation quality test system of the DVB-T signal is tested and analyzed. The validity of the demodulation algorithm and the correctness of the test system are verified.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN949.197

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