【摘要】：DTMB是我國目前正在大力推廣的數(shù)字電視地面廣播標準,其信號調(diào)制質(zhì)量的好壞直接影響到DTMB傳輸系統(tǒng)質(zhì)量的高低。設(shè)計一個能對DTMB信號的系統(tǒng)信息自動識別、能對調(diào)制質(zhì)量參數(shù)一鍵式準確測量的測試系統(tǒng),對數(shù)字電視設(shè)備的生產(chǎn)制造與調(diào)試、數(shù)字電視產(chǎn)業(yè)的應用推廣等都具有積極的意義。本文主要工作概括如下:1.分析和研究了測試系統(tǒng)研發(fā)的主要工作。解析DTMB標準發(fā)送端流程,研究了DTMB接收端原理和處理流程,詳細介紹了DTMB基本信號幀的結(jié)構(gòu)特點和DTMB信道特征,以DTMB信號同步算法和信道估計與均衡算法的設(shè)計作為DTMB系統(tǒng)信號調(diào)制質(zhì)量測試系統(tǒng)設(shè)計的主要工作。2.DTMB系統(tǒng)解調(diào)同步算法研究。分析了DTMB的信號幀結(jié)構(gòu)特點,設(shè)計了DTMB信號幀頭模式識別算法、符號同步算法和頻偏估計與補償算法,并在Matlab軟件平臺上仿真驗證算法的有效性。3.DTMB系統(tǒng)解調(diào)信道估計與均衡技術(shù)研究。根據(jù)DTMB信號不同幀頭模式的特點,設(shè)計了不同的信道估計與均衡方法,減小符號間干擾對信道估計的影響,提高信道估計精度,并進行了仿真驗證。4.DTMB信號調(diào)制質(zhì)量測試軟件設(shè)計。基于DTMB的信號同步算法和信道估計與均衡算法,設(shè)計了測試軟件的總體框架和各個功能模塊,開發(fā)了DTMB信號調(diào)制質(zhì)量測試軟件,并結(jié)合硬件平臺進行測試,驗證了測試系統(tǒng)的準確性。
[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.
【學位授予單位】：合肥工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN949.197

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