【摘要】：數(shù)字地面電視廣播具有實現(xiàn)成本低、發(fā)送接收靈活和覆蓋范圍廣等優(yōu)點,DVB-T是目前世界上應(yīng)用范圍最廣泛的數(shù)字地面電視廣播系統(tǒng),由歐洲數(shù)字廣播電視組制定開發(fā)。該系統(tǒng)提供了多種參數(shù)選擇的組合,可以適應(yīng)高斯信道以及各種多徑信道下視頻圖像的傳輸,具有很強的抗干擾抗失真能力。本文主要論述DVB-T系統(tǒng)中多載波傳輸OFDM調(diào)制技術(shù)的原理和關(guān)鍵技術(shù),對DVB-T信道編碼部分進(jìn)行了深入的研究和探索。文章的主要研究內(nèi)容有:詳細(xì)闡述了OFDM調(diào)制的工作原理和實現(xiàn)方法,介紹了幾種OFDM調(diào)制中的關(guān)鍵技術(shù)及這些技術(shù)在信號傳輸過程中起到的作用,如導(dǎo)頻技術(shù)、循環(huán)前綴技術(shù)和同步技術(shù),提出了一種新的實現(xiàn)復(fù)雜度低,不占據(jù)額外帶寬的定時同步方法。重點介紹了DVB-T系統(tǒng)OFDM幀結(jié)構(gòu)和信道編碼部分各功能模塊的原理,給出了各模塊具體的算法實現(xiàn),這些模塊主要包括:能量驅(qū)散、RS編碼、卷積交織、卷積編碼、符號交織、比特交織、星座映射、參考信號和OFDM調(diào)制。列出了這些模塊中主要C++功能函數(shù)和關(guān)鍵參數(shù),統(tǒng)一了各模塊函數(shù)的接口,實現(xiàn)數(shù)字基帶數(shù)據(jù)的生成。針對醫(yī)療系統(tǒng)的應(yīng)急通信需求,結(jié)合醫(yī)學(xué)圖像的傳輸背景和編碼特點,給出了通過DVB-T系統(tǒng)傳輸幾種不同醫(yī)學(xué)圖像的方法,通過微波矢量信號發(fā)生器驗證的系統(tǒng)的正確性。論文工作對于建立基于軟件無線電平臺DVB-T廉價系統(tǒng),以及嘗試DVB-T在醫(yī)學(xué)中應(yīng)用,如傳輸醫(yī)學(xué)圖像和其他生理信號數(shù)據(jù),具有一定的實用價值。
[Abstract]:DVB-T is the most widely used digital terrestrial television broadcasting system in the world. It is developed by European Digital Radio Television Group. The system provides a combination of various parameters and can be adapted to the transmission of video images in Gao Si channel and various multipath channels. It has strong anti-jamming and anti-distortion capability. This paper mainly discusses the principle and key technology of OFDM modulation in DVB-T system, and makes a deep research and exploration on DVB-T channel coding. The main contents of this paper are as follows: the working principle and realization method of OFDM modulation are described in detail, and the key technologies of OFDM modulation and their functions in signal transmission process, such as pilot technology, are introduced. A new timing synchronization method with low implementation complexity and no extra bandwidth is proposed for cyclic prefix and synchronization. This paper mainly introduces the structure of OFDM frame in DVB-T system and the principle of each function module of channel coding, and gives the realization of each module. These modules mainly include: energy dispersing RS coding, convolution interleaving, convolution coding, symbol interleaving, and so on. Bit Interleaver, Constellation Mapping, reference signal and OFDM Modulation. The main C function functions and key parameters of these modules are listed. The interface of each module function is unified to realize the generation of digital baseband data. According to the need of emergency communication in medical system, combined with the transmission background and coding characteristics of medical image, this paper presents several methods of transmitting different medical images through DVB-T system, and verifies the correctness of the system by microwave vector signal generator. The work of this paper is of practical value for the establishment of DVB-T cheap system based on software radio platform and the attempt of DVB-T application in medicine, such as the transmission of medical images and other physiological signal data.
【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】：TN919.8;TN929.53;TN949.1

【參考文獻(xiàn)】

相關(guān)期刊論文 前5條

1 蔡文軍;謝建福;于永;李立宇;劉彬;謝嵩源;代晶;田川;;災(zāi)難應(yīng)急醫(yī)療信息系統(tǒng)平臺設(shè)計[J];醫(yī)療衛(wèi)生裝備;2015年06期

2 陸許明;溫偉杰;羅家維;譚洪舟;;OFDM系統(tǒng)同步算法研究及其VLSI實現(xiàn)[J];通信技術(shù);2013年05期

3 王海濤;;應(yīng)急通信發(fā)展現(xiàn)狀和技術(shù)手段分析[J];電力系統(tǒng)通信;2011年02期

4 張丙杰;胡捍英;王大鳴;;基于交織循環(huán)前綴的MIMO-OFDM系統(tǒng)多符號定時同步[J];通信學(xué)報;2010年S1期

5 張潔,蔡鵬,張平;一種適用于多徑衰落信道的OFDM定時同步算法[J];北京郵電大學(xué)學(xué)報;2005年02期

相關(guān)碩士學(xué)位論文 前4條

1 蔣一杰;基于Nx SC-FDMA的下一代高鐵數(shù)字電視地面廣播關(guān)鍵技術(shù)研究[D];上海交通大學(xué);2015年

2 王偉;基于FPGA的DVB-T發(fā)射機的設(shè)計與實現(xiàn)[D];南京郵電大學(xué);2013年

3 周慧影;基于DTMB發(fā)端系統(tǒng)的FPGA實現(xiàn)[D];電子科技大學(xué);2012年

4 吳紹榮;MPEG-2編碼系統(tǒng)研究與設(shè)計[D];電子科技大學(xué);2001年

，

本文編號：2234660