基于System View的數(shù)字電視有線傳輸系統(tǒng)的仿真設(shè)計(jì)
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摘 要
當(dāng)前科學(xué)技術(shù)日新月異, 隨著信息產(chǎn)業(yè)建設(shè)的加速, 數(shù)字技術(shù)已廣泛地進(jìn)入人類生活的許多領(lǐng)域, 數(shù)字化浪潮正以磅礴之勢(shì)席卷全球, 使我們從工業(yè)社會(huì)邁向信息社會(huì), 數(shù)字電視也就應(yīng)運(yùn)而生, 即將進(jìn)入千家萬戶。
我國目前城鎮(zhèn)居民收看電視的主要接入方式就是有線電視。它擁有龐大的用戶群體，相對(duì)于衛(wèi)星傳輸和地面?zhèn)鬏攣碚f有更廣大的發(fā)展前景。有線電視網(wǎng)具有頻帶寬、信息量大、傳輸質(zhì)量高、覆蓋面廣、用戶多等優(yōu)勢(shì), 隨著數(shù)字技術(shù)、網(wǎng)絡(luò)技術(shù)的發(fā)展, 更顯其網(wǎng)絡(luò)資源蘊(yùn)藏的價(jià)值。數(shù)字電視無疑是廣電未來最有發(fā)展前途的業(yè)務(wù), 將給廣電帶來新的業(yè)務(wù)增長點(diǎn),并將推動(dòng)了國家信息產(chǎn)業(yè)和民族工業(yè)的發(fā)展。因此，數(shù)字電視有線傳輸系統(tǒng)的研究，對(duì)我國的數(shù)字有線電視傳輸標(biāo)準(zhǔn)的制定和取得有中國自主權(quán)的數(shù)字電視傳輸標(biāo)準(zhǔn)具有重要意義。
本文利用System View對(duì)DVB-C的系統(tǒng)組成、傳輸技術(shù)、傳輸技術(shù)的標(biāo)準(zhǔn)作了簡單介紹，對(duì)QAM調(diào)制解調(diào)、RS編解碼，交織編譯碼進(jìn)行仿真，并對(duì)結(jié)果進(jìn)行分析，對(duì)DVB-C系統(tǒng)的性能進(jìn)行了評(píng)估。



關(guān)鍵字: DVB-C；QAM；RS編解碼器

Based on SystemView digital television wired transmission system simulation design
Abstract
Current science and technology changes with each new day, along with the information industries construction acceleration,the digital technology widely entered many domains which the humanity lives, the digitized tide by the boundless potential is engulfing the entire world, causes us from the industry society to advance to the information society, the digital television also arises at the historic moment, soon enters everyone.
Our country the cities inhabitant watches the television at present the main turning on way is the cable TV. It has the huge user community, is opposite has the more general prospects for development in the satellite transmission and the ground transmission. The wired television network has the band width, the information content in a big way, the transmission quality high, the coverage broad, the user many and so on the superiority, along with the digital technology, the networking development, reveals its network resources implication the value. The digital television will be without doubt Guang Dian future most has the development future service, will give the broad electricity to bring the new service point of growth, and impelled the country information industries and the national industry development therefore, the digital television wired transmission system research, and will obtain to our country's digital cable TV transmission standard formulation has the Chinese right to independence digital television transmission standard to have the vital significance.
This article used System View to the DVB-C system composition, the transmission technology, the transmission technology standard has made the simple introduction, to the QAM modulation demodulation, RS arranged the decoding, interwove arranges the decoding to carry on the simulation, and carried on the analysis to the result, has carried on the appraisal to the DVB-C system performance.



Key words: DVB-C；QAM；RS arranges the decoding

目 錄
1.引言 1
1.1 課題的研究背景及選題意義 1
1.2 國內(nèi)外技術(shù)現(xiàn)狀 2
1.3 中國有線數(shù)字電視發(fā)展趨勢(shì) 3
1.4 論文主要工作與內(nèi)容安排 4
2.數(shù)字電視有線傳輸系統(tǒng)的組成原理 5
2.1 數(shù)字通信系統(tǒng)的一般組成 5
2.2 數(shù)字電視有線傳輸系統(tǒng)組成 6
2.2.1 系統(tǒng)框圖及概念 6
2.2.2 MPEG-2傳輸復(fù)用包的形成 7
2.2.3 字節(jié)到符號(hào)的映射 9
2.2.4 QAM調(diào)制 9
2.2.5 網(wǎng)絡(luò)系統(tǒng) 10
2.3 有線數(shù)字電視前端系統(tǒng) 10
2.3.1 信號(hào)輸入部分 10
2.3.2 信號(hào)處理部分 11
2.3.3 信號(hào)輸出部分 11
2.3.4 系統(tǒng)管理部分 12
2.3.5 數(shù)字電視前端的調(diào)試 12
3.數(shù)字電視有線傳輸技術(shù)基礎(chǔ) 13
3.1數(shù)字電視有線傳輸主流標(biāo)準(zhǔn)與方式 13
3.2 差錯(cuò)控制技術(shù) 13
3.2.1 能量擴(kuò)散 14
3.2.2 RS編碼 14
3.2.3 卷積交織 15
3.2.4 格狀編碼(TCM) 15
3.2.5 數(shù)字差錯(cuò)控制編碼在數(shù)字電視有線傳輸中的應(yīng)用 16
3.3調(diào)制技術(shù) 16
3.3.1 MVSB調(diào)制 16
3.3.2 MQAM調(diào)制 17
3.4數(shù)字電視有線傳輸系統(tǒng)主要性能參數(shù) 18
3.4.1 脈沖編碼調(diào)制信號(hào)的帶寬 18
3.4.2 視頻信噪比 19
3.4.3 誤碼率 19
3.4.4 抖動(dòng)功能 19
3.4.5 可靠性與可用性 20
4. DVB系統(tǒng)的System View仿真 21
4.1 System View仿真系統(tǒng)簡介 21
4.2 QAM調(diào)制解調(diào)模塊的仿真 21
4.2.l、QAM仿真模塊的組成 22
4.2.2 參數(shù)設(shè)置 22
4.2.3 仿真結(jié)果及分析 23
4.3 RS編譯碼模塊的仿真 26
4.3.1 仿真原理圖 26
4.3.2 參數(shù)設(shè)置 26
4.3.3 仿真結(jié)果及分析 27
4.4 交織編譯碼模塊的仿真 28
4.4.1 仿真原理圖 28
4.4.2 參數(shù)設(shè)置 29
4.4.3 仿真結(jié)果及分析 29
總結(jié)與展望 31
謝辭 32
參考文獻(xiàn) 33


參考文獻(xiàn)
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