發(fā)布時間：2018-03-26 04:23

  本文選題：DVB-T　切入點：解調(diào)　出處：《合肥工業(yè)大學(xué)》2017年碩士論文

【摘要】：近年來,數(shù)字電視產(chǎn)業(yè)取得了長足的發(fā)展,高質(zhì)量的數(shù)字電視傳輸標(biāo)準是重要的研究內(nèi)容之一。作為歐洲研發(fā)的地面數(shù)字視頻傳輸標(biāo)準,DVB-T(Digital Video Broadcasting Terrestrial)是當(dāng)前制式應(yīng)用最廣泛、最靈活的標(biāo)準之一。然而,地面?zhèn)鬏敪h(huán)境對射頻信號傳輸影響巨大,且當(dāng)前對矢量信號分析測量的設(shè)備大多依賴國外進口,相應(yīng)的測試軟件也價格高昂、不易擴展。因此,為科學(xué)評估DVB-T信號傳輸信道環(huán)境,計算各項調(diào)制質(zhì)量指標(biāo),設(shè)計一款DVB-T解調(diào)與調(diào)制質(zhì)量測試系統(tǒng)具有十分重要的意義。本文的主要內(nèi)容如下:(1)闡述了OFDM基本理論基礎(chǔ),解讀了DVB-T標(biāo)準,介紹了DVB-T發(fā)射端系統(tǒng),提出了DVB-T接收端完整的解調(diào)設(shè)計方案。(2)研究了DVB-T標(biāo)準解調(diào)中主要算法:帶寬模式判定算法、模式識別與同步算法和信道估計算法,并提出了一種改進DVB-T信道估計算法,可提高算法精度和降低算法整體復(fù)雜度。(3)設(shè)計了DVB-T解調(diào)與調(diào)制質(zhì)量測試系統(tǒng),介紹了測試系統(tǒng)的需求分析、總體框架設(shè)計,以及采用模塊化設(shè)計思想的各個模塊實現(xiàn)方法。(4)利用相關(guān)實驗設(shè)備選擇測試用例進行了DVB-T信號的解調(diào)與調(diào)制質(zhì)量測試系統(tǒng)的測試與分析,驗證了該解調(diào)算法的有效性與測試系統(tǒng)的正確性。
[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.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN949.197

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