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1、浅谈无线视频监控传输技术发展TalkaboutwirelessvideomonitoringtransmissiontechnologydevelopmentItcomesfromtheChinesesecuritynetworkVideoimagetransmissionwirelessbrokethetraditionalcoaxialcableandopticalfiberimagemonitoringunderthecontroloftheunfavorablesituationofhardwareconnection,moreflexibilityandconvenience,th
2、evideosurveillancesystembasedonwirelessnetworkarisesatthehistoricmoment・Wirelessvideotransmissiontechnologyhasbeenthedevelopmentofthewirelessmobilenetworkarchitectureandprotocolhadaprofoundimpact,butduetothelimitedbandwidthofwirelesschannelresources,interferencefactors,dataandvideosignal,highreal-t
3、imedemand・WirelessvideomonitoringtransfertechnologyThepurposeoftransmissionresearchonreliablechannelistomakefulluseofthechanneTsbandwidthresources・Inthecaseofunreliablechannel,thefocusofresearchontransmissionistomakefulluseofthebandwidthresourcestoachievereliabletransmission,whichisthefaulttolerant
4、transmissiontechnique・Thevideotransmissionmechanismonthewirelesschannelisdiscussedhere,anditsmainresearchpointsarefaulttoleranttransmissioncontro1.Thefaulttoleranttransmissioncontroltechnologycanbedividedintothreecategoriesbasedonthedifferentcontrolmethods:thepre-errorcontrol,thefeedbackbasedARQand
5、thesourcechannelcocoding.ForwardErrorControl(FEC)includeschannelcorrectioncodingtechniques,interwovenpackagingtechniques,andoptimizedpackageschedulingmechanisms・BasedonthefeedbackmechanismofARQtechniquesincludeusingmultipleReferenceframesofReferenceframeSelection(ReferencePictureSelection,RPS)mecha
6、nism,theHybridARQ(Hybrid,HARQ)mechanism,andbasedontheARQfeedbackerrortrackingtechnology.DuetothefaulttoleranttransmissioncontroltechnologybasedontheARQwithexcellentperformance,sointheemphasisonthetransmissionoftheARQrelatedcontroltechnology,anddiscusstheexistingvideotransmittingmechanismoffaulttole
7、rance・Theerrorcontrolmethodisusedtoovercomechannelerrors・Inchannelerrorprobabilityiswithseverecases(e.g.,existingmobi1echannel),inordertoobtainacertaintransmissionquality,forwarderrorcorrectioncodingmustbeb
