基于SystemView的數字電視有線傳輸系統的仿真設計

論文編號:TX271  論文字數:21682,頁數:34，有開題報告，任務書

摘 要
 當前科學技術日新月異, 隨著信息產業建設的加速, 數字技術已廣泛地進入人類生活的許多領域, 數字化浪潮正以磅礴之勢席卷全球, 使我們從工業社會邁向信息社會, 數字電視也就應運而生, 即將進入千家萬戶。
 我國目前城鎮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，相對于衛星傳輸和地面傳輸來說有更廣大的發展前景。有線電視網具有頻帶寬、信息量大、傳輸質量高、覆蓋面廣、用戶多等優勢, 隨著數字技術、網絡技術的發展, 更顯其網絡資源蘊藏的價值。數字電視無疑是廣電未來最有發展前途的業務, 將給廣電帶來新的業務增長點,并將推動了國家信息產業和民族工業的發展。因此，數字電視有線傳輸系統的研究，對我國的數字有線電視傳輸標準的制定和取得有中國自主權的數字電視傳輸標準具有重要意義。
 本文利用System View對DVB-C的系統組成、傳輸技術、傳輸技術的標準作了簡單介紹，對QAM調制解調、RS編解碼，交織編譯碼進行仿真，并對結果進行分析，對DVB-C系統的性能進行了評估。

關鍵字: 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 國內外技術現狀 2
1.3 中國有線數字電視發展趨勢 3
1.4 論文主要工作與內容安排 4
2.數字電視有線傳輸系統的組成原理 5
2.1 數字通信系統的一般組成 5
2.2 數字電視有線傳輸系統組成 6
2.2.1  系統框圖及概念 6
2.2.2  MPEG-2傳輸復用包的形成 7
2.2.3  字節到符號的映射 9
2.2.4  QAM調制 9
2.2.5  網絡系統 10
2.3 有線數字電視前端系統 10
2.3.1  信號輸入部分 10
2.3.2  信號處理部分 11
2.3.3  信號輸出部分 11
2.3.4  系統管理部分 12
2.3.5  數字電視前端的調試 12
3.數字電視有線傳輸技術基礎 13
3.1數字電視有線傳輸主流標準與方式 13
3.2 差錯控制技術 13
3.2.1  能量擴散 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 數字差錯控制編碼在數字電視有線傳輸中的應用 16
3.3調制技術 16
3.3.1  MVSB調制 16
3.3.2  MQAM調制 17
3.4數字電視有線傳輸系統主要性能參數 18
3.4.1  脈沖編碼調制信號的帶寬 18
3.4.2  視頻信噪比 19
3.4.3  誤碼率 19
3.4.4  抖動功能 19
3.4.5  可靠性與可用性 20
4. DVB系統的System View仿真 21
4.1 System View仿真系統簡介 21
4.2 QAM調制解調模塊的仿真 21
4.2.l、QAM仿真模塊的組成 22
4.2.2 參數設置 22
4.2.3 仿真結果及分析 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 參數設置 26
4.3.3 仿真結果及分析 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 參數設置 29
4.4.3 仿真結果及分析 29
總結與展望 31
謝辭 32
參考文獻 33