HFC網(wǎng)絡(luò)論文：數(shù)字電視信號的HFC網(wǎng)絡(luò)傳輸研究

1、HFC 網(wǎng)絡(luò)論文：數(shù)字電視信號的 HFC 網(wǎng)絡(luò)傳輸研究【中文摘要】目前，中國有線電視數(shù)字化工程正在各個城市轟轟 烈烈地開展當中。對于中國的廣電技術(shù)人員來說，將面臨從模擬有線 電視的維護工作向維護數(shù)字電視的轉(zhuǎn)變。當前中國的有線電視網(wǎng)絡(luò)結(jié) 構(gòu)形式基本上都是 HFC 光纖同軸混合） ,從模擬電視向數(shù)字電視的轉(zhuǎn) 變需要的僅僅是在網(wǎng)絡(luò)的前端機房增加數(shù)字電視信號編碼和調(diào)制設(shè) 備和用戶終端增加數(shù)字電視信號解調(diào)和解碼設(shè)備（數(shù)字電視機頂盒）,然后將 HFC 網(wǎng)絡(luò)中傳輸?shù)哪M電視信號變?yōu)閿?shù)字電視信號就可以完 成。但是，由于數(shù)字電視信號和模擬電視信號采用了不同的編碼和調(diào) 制方式,數(shù)字電視信號在原來傳送模擬電視信號的

2、HFC 網(wǎng)絡(luò)中會不會發(fā)生新的問題，僅僅從理論分析上是無法預測的。因此,結(jié)合南京廣電 網(wǎng)絡(luò)公司數(shù)字電視整體轉(zhuǎn)換工程開展 4 個月以來的數(shù)字電視業(yè)務(wù)維 護工作,對 HFC 網(wǎng)絡(luò)狀態(tài)和數(shù)字電視（QAM 信號傳輸?shù)挠绊戇M行了理 論分析和實驗探究。在文章中，主要模擬了 HFC 網(wǎng)絡(luò)系統(tǒng)內(nèi)部常見問 題引起的數(shù)字電視信號故障，分析了典型的 HFC 網(wǎng)絡(luò)系統(tǒng)受外界干擾 引起的數(shù)字電視信號故障，并根據(jù)這兩類故障的特點討論了數(shù)字電視 信號非中斷故障的排查流程?！居⑽恼縉owadays, the digital TV broadcasting service isdeveloping quickly in ma

3、nycities in China. The changing of TV broadcasting from an alog to digital will be a challe nge to most of our televisi onHFC 網(wǎng)絡(luò)論文：數(shù)字電視信號的 HFC 網(wǎng)絡(luò)傳輸研究tech ni cia ns. The main structure ofChina s present Community Antenna Television Network is HFC (HybridFiber Coax).What we need to do to complete the

4、changeis add ing coders and modulators in Head-e nd and decoders anddemodulators in Set-Top-Box, the consumers digital television receiver,then change the signals transmitting in HFC network from analog todigital. However, as an analog signal and a digital sig nal are coded andmodulated in differe n

5、t ways, its difficult to predict if there will be new problems when digital signaltravels in the HFC network which is used for transmitting analog one onlyin theory. As the result, synthesizing the servicing work of digitaltelevision in four mon ths since digital televisi on gen eralizati on project

6、bega n in Nanjing, here are some an alyses in theory andexperimentationsin real situationto study whether the statusof HFC n etwork will in flue nce the QAM sig nal traveli ng in it.In this thesis, somecommoidefects in HFCnetwork system likely to in fluence the digital televisi onsig nal were simula

7、ted, andsome typical exter nal in terfere nce which will in flue nce the digital signals was discussed. At the end of this thesis, con sideri ng thecharacteristics of the two ki nd malfu ncti ons which will in flue nce thedigitalsig nals tran smissi on,how toelim in ate them was discussed.【關(guān)鍵詞】HFC 網(wǎng)

8、絡(luò) 數(shù)字電視信號 QAM 數(shù)字電視業(yè)務(wù)維護 常 見故障【英文關(guān)鍵詞】HFC(Hybrid Fiber Coax) networkdigital televisi on sig nalQAM(Quadrature AmplitudeModulatio n)servic ing work of digital televisi oncom mon defects【備注】索購全文在線加好友自：1.39938848同時提供論文寫作一對一指導和論文發(fā)表委托服務(wù)【目錄】數(shù)字電視信號的 HFC 網(wǎng)絡(luò)傳輸研究 摘要4-5 Abstract 5 第一章 緒論 8-131.1 本文主要研究目的、意義和內(nèi)容 8-101.1.1 研究目的和意義 8-91.1.2 研究內(nèi)容9- 101.2 課題背景 10-121.2.1 HFC 網(wǎng)絡(luò)發(fā)展現(xiàn)狀10- 11 1.2.2 數(shù)字電視的發(fā)展歷程 11-121.3 本課題的研究手段和章節(jié)安排 12-13 第二章 文獻綜述 13-192.1 關(guān)于 HFC 網(wǎng)絡(luò)的研究發(fā)展 13-152.2 關(guān)于數(shù)字電視信號的研究發(fā)展15-19第三章 理論概要 19-413.1 HFC 網(wǎng)絡(luò)結(jié)構(gòu) 19-243.1.1 HFC 網(wǎng)絡(luò)結(jié)構(gòu)概述 19-203.1.2 光纜干線網(wǎng)絡(luò)結(jié)構(gòu) 20-233.1.3 分配電纜網(wǎng)