无线IP移动终端VOIP技术的研究与实现

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1、北京交通大学硕士学位论文无线IP移动终端VoIP技术的研究与实现姓名：张朝娟申请学位级别：硕士专业：软件工程指导教师：路鹏;张红延20080601ABSTRACTv0IPistheabbreviatedformofVoiceoverInteractProtocol，itmeanstransmittinganalogsignalsofvoiceonInternetafterconvertingthemintodigitalsignals，SOithasthecharactersoflowcostandhi．ghexpan

2、sibility．Inrecentyears，moreandmorecompaniesaretryingtOdevelopproductsbasedonVolP,andtheirresearchresultsmakeVolPtechniquerelativelymaturenow．ButacomingseriousproblemisthatIPInternetcallnotpromisethe(QualityofServicc)QoSofreal-timecommunicationsignalslikevoiceand

3、video，SOhowtoguaranteeVoIPQoSbecomethebottlenecktopopularizeVoIPapplication．Thisthesisisjustbasedonthisbottleneckanditprovidetherelevantsolutions．ThefirstpartofthethesisdescribesthecurrentresearchsituationofVolPathomeandabroadandextractstheQoSproblemsnOWthatwesh

4、ouldfaceto．ThemiddlepartdescribesthetheoryofVolPQoS，analyzesthekeyfactorsthataffecttheQoS：voicecodingmethod，jitterbuffertechnique，echocancellation，thenputforwardtorelaventproposals：Evaluatethedifferentvoiceencryptionalgorithmbasingonbandwidthrequirement，averagev

5、iewpointvalue，distortiondamagevalue，complexityandothermoremarks；Introducethejitterbufferalgorithmandpraiseself-adaptingjitterbufferalgorithmisthebestalgorithmcurrentlytoresolvethejitter；Discribesechocancellationandprovidethemethodofechocanceller．Thelastpartintro

6、sucesthemobileterminalproject，emphasizetherelevantmethodsthatshouldbeadoptedtoguaranteeQoS，providetheconcretedesignprocessandthemaindatastructureandalgorithm；Thelatterendgivestheconclusionofthewholethesisandprovidesthetechniquesshouldbefurtherresearchednextstep．

7、Theprojectthatthisthesisbasesonhasbeenfinishedandtheprouducthasbeenputintomarket．KEYWORDS：VolP；MobileTermination；QoS；Delay；Jitter；EchoCancellationCL气SSNO：TP311．52；004．4学位论文版权使用授权书本学位论文作者完全了解北京交通大学有关保留、使用学位论文的规定。特授权北京交通大学可以将学位论文的全部或部分内容编入有关数据库进行检索，并采用影印、缩印或扫描等复制手

8、段保存、汇编以供查阅和借阅。同意学校向国家有关部门或机构送交论文的复印件和磁盘。学位论文作者签名：孩轩娟签字同期：砷‘月弓日翩签名：成＆足、签字日期：z。舀弓年万月了同独创性声明本人声明所呈交的学位论文是本人在导师指导下进行的研究工作和取得的研究成果，除了文中特别加以标注和致谢之处外，论文中不包含其他人已经发表或撰写过的研究成果，