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时间:2020-04-24
《光突发交换网络中基于LDPC码的丢包恢复机制-论文.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第43卷第7期光子学报Vol
2、43No.72O14年7月ACTAPH0T0NICASINICATulv2O14doi:10.3788/gzXb2O1443O7.0706021光突发交换网络中基于LDPC码的丢包恢复机制黄胜,李佳良,张春明,杨晓非(重庆邮电大学光纤通信重点实验室,重庆400065)摘要:基于前向纠错编码理论,在光突发交换网络中提出一种丢包恢复机制来降低突发丢失率.构造了一种能对突发包进行在线编解码的低密度奇偶校验码.入口边缘节点通过对信息突发包进行在线编码产生冗余突发包,出口边缘节点利用译码算法从接收到的突发包中恢复出丢失的突发数据.另外,为信息突发包增加一个额外的偏
3、置时间以减少冗余突发与信息突发竞争信道资源.通过OPNET仿真软件对不同丢包恢复机制的性能进行仿真,结果表明,与奇偶校验码提出的丢包恢复机制相比,具有更低的突发丢失率和良好的丢包恢复能力.关键词:光突发交换;低密度奇偶校验码;丢包恢复;在线;额外偏置时间中图分类号:TN929.11文献标识码:A文章编号:1004—4213(2014)07—070602卜6ResearchonBurstLossRecoveryBasedonLDPCCodesinOpticalBurstSwitchingNetworksHUANGSheng,LIJia—liang,ZHANGChun—ming,YANG
4、Xiao—fei(KeyLabofOpticalFibreCommunicationTechnology,ChongqingUniversityofPostsandTelecommunications,Chongqing400065,China)Abstract:Aburstlossrecoverymechanismbasedonforwardfrrorcorrectionwasproposedtoreduceburstlossprobabilityinopticalburstswitchingnetworks.Anewlow-densityparity—checkcodewasde
5、signedtoencodeanddecodeburstsonline.Intheingressnode,encodergeneratedredundantburstsbyencodinginformationbursts,andinegressnode,decodingalgorithmwasusedforrecoveringlostbursts.Forredundantburstscontendedwithinformationburstsforwavelengthresourceandthatmayresultinlargeinformationbursts1OSS,extra
6、—offsettimewasaddedforinformationburst.Theperformanceofdifferentburst1OSSrecoverymechanismwasinvestigatedbyOPNETsimulationsoftware,theresultsshowthattheburstlossrecoverymechanismcanreduceburstlOSSprobabilitymoreefficientlycomparedwithpairty—checkcodes.Therefore,themechanismisprovidedwithgoodcap
7、abilityofburstlossrecovery.Keywords:Optica1burstswitching;Low-densityparity-checkcodes;BurstlOSSrecovery;Online;Extraoffset—timeoCISCodes:060.233O;060.4250;060.4265;060.6719evolution.OpticalBurstSwitching(OBS)isdeveloped0IntroductionasoneoithemostpromisingopticalswitchingThecapacityofopticaltra
8、nsmissionsystemstechnologiesforthenextgenerationWavelengthshouldberapidlyincreasedinthenearfuture.TheDivisionMultiplexing(WDM)networks,whichabilitytosimplyupgradinglowbit—ratesystemstocombinestheadvantagesofbothOpticalPackethigher
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