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1、UsingDS-CDMAtoRealizeBi--directionCommunicationsinCATVNetwork直接使用碼分多址序列實現(xiàn)雙方向通信有線電視網(wǎng)絡(luò)Abstract:Tnthispaper,anewschemeusingDS-CDMAtorealizeBi—DirectioncommunicationsinCATVnetworkisaddressed.Asacolusion,wecanfindthatthisisaneconomicalrealizationofaccessnetwork,havinggoodperformancesco
2、mparedwithsomeotherschemes.文摘:在這篇文章中,一個新的計劃在有線電視使用碼分多址實現(xiàn)雙向通信網(wǎng)絡(luò)解決。作為一個解決方案,我們可以發(fā)現(xiàn)這是一個經(jīng)濟的實現(xiàn)訪問網(wǎng)絡(luò),與其他方案相比具有良好的性能。1.Introduction1.介紹Withthedevelopmentofmoderncommunications,theaccessnetworktechnologyisshowingitsgreatimportancedaybyday.隨著現(xiàn)代通信的發(fā)展,接入網(wǎng)技術(shù)正顯示出其重視。Theaccessnetworktechnologyca
3、nbedividedintofourcategories:advancedcottoncabletechnology,FITLsystem,CATVnetworkandWLLsystem.接入網(wǎng)技術(shù)可分為四類:先進的棉花電纜技術(shù),光纖環(huán)路系統(tǒng)、宥線電視網(wǎng)絡(luò)和系統(tǒng)廣泛分布有線電視網(wǎng)絡(luò)。ThepopularlydistributedCATVnetwork,foritsrelativelylowpriceandgoodbroadbandtransportcharacteristics,maybethemostprospectivemediatorealizemu
4、lti-servicecommunicationsincludingvoice,dataandmovingpicture.因其相對較低的價格和良好的寬帶運輸特點,可能是最準媒體實現(xiàn)多業(yè)務通信包括語音,數(shù)據(jù)和移動圖像。Inthispaper,anewschemeusingDS—CDMAtorealizeBi-DirectioncommunicationsinCATVnetworkisaddressed.在本文使用碼分多址的新方案在有線電視網(wǎng)絡(luò)實現(xiàn)雙向通信地址。Asacolusion,wecanfindthatthisiseconomicalandwithgo
5、odperformancescomparedwithsomeotherschemes.作為一個解決方案,我們可以發(fā)現(xiàn)這是經(jīng)濟和與其他方案相比具有良好的性能。1.ExistingCATVNetwork1.現(xiàn)有的有線電視網(wǎng)絡(luò)TheCATVnetworkisahierarchicalandsingle-directionsystem,aswecanseefromFig.1,composedofthreeparts:frontendpart,transportationpartanduserdistributionpart.Inthetranportationli
6、nes,therearemanyequipmentssuchasamplifiers,branchesanddistributors.有線電視網(wǎng)絡(luò)層次和發(fā)展性系統(tǒng),從圖1中我們可以看到,由三部分組成:前端部分,運輸和用戶分配部分。交通運輸線路,有很多設(shè)備如放大器、分女機構(gòu)和分銷商。1.Bi—directionSystemDesign1.雙向系統(tǒng)設(shè)計TnordertomakeBi-directioncommunicationavailable,wedividethewholebandwidthintotwos:0—50MIIzastheupwardpassw
7、ayand50-400MHzasthedownwardpassway.ItisalsoneededtochangetheexistingsingledirectionequipmentsintransportationlinesintoBi-directionequipments,JustAsFig.2.為了提供雙向的溝通,我們將整個帶寬分為兩個:0-50MIIz的上行通道和50-400MHz下行通道。它也需要改變現(xiàn)有的單一方向的設(shè)備在運輸?shù)紹i-方向行設(shè)備,如圖2所示。Fig>2Bi—directionTrasportationLines2.Featur
8、esofSpreadSpectrumCommunication1.