DTMB系统信号调制质量测试系统设计
发布时间：2019-01-01 09:20
【摘要】：DTMB是我国目前正在大力推广的数字电视地面广播标准,其信号调制质量的好坏直接影响到DTMB传输系统质量的高低。设计一个能对DTMB信号的系统信息自动识别、能对调制质量参数一键式准确测量的测试系统,对数字电视设备的生产制造与调试、数字电视产业的应用推广等都具有积极的意义。本文主要工作概括如下:1.分析和研究了测试系统研发的主要工作。解析DTMB标准发送端流程,研究了DTMB接收端原理和处理流程,详细介绍了DTMB基本信号帧的结构特点和DTMB信道特征,以DTMB信号同步算法和信道估计与均衡算法的设计作为DTMB系统信号调制质量测试系统设计的主要工作。2.DTMB系统解调同步算法研究。分析了DTMB的信号帧结构特点,设计了DTMB信号帧头模式识别算法、符号同步算法和频偏估计与补偿算法,并在Matlab软件平台上仿真验证算法的有效性。3.DTMB系统解调信道估计与均衡技术研究。根据DTMB信号不同帧头模式的特点,设计了不同的信道估计与均衡方法,减小符号间干扰对信道估计的影响,提高信道估计精度,并进行了仿真验证。4.DTMB信号调制质量测试软件设计。基于DTMB的信号同步算法和信道估计与均衡算法,设计了测试软件的总体框架和各个功能模块,开发了DTMB信号调制质量测试软件,并结合硬件平台进行测试,验证了测试系统的准确性。
[Abstract]:DTMB is a digital television terrestrial broadcasting standard which is being popularized in our country at present. The quality of signal modulation directly affects the quality of DTMB transmission system. The design of a test system which can automatically recognize the system information of DTMB signal, can accurately measure the modulation quality parameter by one key, is of positive significance to the manufacture and commissioning of digital television equipment, the application and popularization of digital television industry, etc. The main work of this paper is summarized as follows: 1. The main work of research and development of test system is analyzed and studied. The principle and processing flow of DTMB receiver are studied, and the structure characteristics of DTMB basic signal frame and the characteristics of DTMB channel are introduced in detail. The design of DTMB signal synchronization algorithm and channel estimation and equalization algorithm is taken as the main work in the design of signal modulation quality test system in DTMB system. The demodulation synchronization algorithm of 2.DTMB system is studied. This paper analyzes the characteristics of DTMB signal frame structure, designs DTMB signal frame head pattern recognition algorithm, symbol synchronization algorithm and frequency offset estimation and compensation algorithm. The effectiveness of the algorithm is verified by simulation on Matlab software platform. The demodulation channel estimation and equalization technology of 3.DTMB system is studied. According to the characteristics of different frame head modes of DTMB signal, different channel estimation and equalization methods are designed to reduce the influence of inter-symbol interference on channel estimation and improve the accuracy of channel estimation. The software design of 4.DTMB signal modulation quality test is also carried out. Based on the signal synchronization algorithm and channel estimation and equalization algorithm of DTMB, the overall framework and each function module of the test software are designed, and the modulation quality testing software of DTMB signal is developed, and the test is carried out on the hardware platform. The accuracy of the test system is 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
本文编号：2397341
[Abstract]:DTMB is a digital television terrestrial broadcasting standard which is being popularized in our country at present. The quality of signal modulation directly affects the quality of DTMB transmission system. The design of a test system which can automatically recognize the system information of DTMB signal, can accurately measure the modulation quality parameter by one key, is of positive significance to the manufacture and commissioning of digital television equipment, the application and popularization of digital television industry, etc. The main work of this paper is summarized as follows: 1. The main work of research and development of test system is analyzed and studied. The principle and processing flow of DTMB receiver are studied, and the structure characteristics of DTMB basic signal frame and the characteristics of DTMB channel are introduced in detail. The design of DTMB signal synchronization algorithm and channel estimation and equalization algorithm is taken as the main work in the design of signal modulation quality test system in DTMB system. The demodulation synchronization algorithm of 2.DTMB system is studied. This paper analyzes the characteristics of DTMB signal frame structure, designs DTMB signal frame head pattern recognition algorithm, symbol synchronization algorithm and frequency offset estimation and compensation algorithm. The effectiveness of the algorithm is verified by simulation on Matlab software platform. The demodulation channel estimation and equalization technology of 3.DTMB system is studied. According to the characteristics of different frame head modes of DTMB signal, different channel estimation and equalization methods are designed to reduce the influence of inter-symbol interference on channel estimation and improve the accuracy of channel estimation. The software design of 4.DTMB signal modulation quality test is also carried out. Based on the signal synchronization algorithm and channel estimation and equalization algorithm of DTMB, the overall framework and each function module of the test software are designed, and the modulation quality testing software of DTMB signal is developed, and the test is carried out on the hardware platform. The accuracy of the test system is 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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