无线影音串流技术面面观

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1、StackInfinitePower無線影音串流技術面面觀劉尚淳鉅景科技RFSiP事業處資深協理2011/9/13AgendaMarketAcceptanceScienceChallengeStandardExtension(Amendments)MIMO1080p1080iAVStreamingSiPModuleSimpleWaytoSmartLife2StackInfinitePowerMarketAcceptanceScienceChallengeStandardExtensicMIMO1080p1080iAVStreamingSiPM

2、oduleSimpleWaytoSmartLife3StackInfinitePowerMarketSizeandTrends9002millionUnits800perday700–Marketsize&segmentdiversitycontinuetoincrease6005004001millionUnitsperday300200EnterpriseAPs1000Source:In‐Stat20062010Home/SOHOCEPhonesPCs4SimpleWaytoSmartLife4StackInfinitePowerPers

3、onal802.15.3Bluetooth60GHzUWBWideGSM,CDMA,UMTS…3GPPRegionalTVWS802.22Local802.11Wi‐FiMetro802.16WiMAXSimpleWaytoSmartLife5StackInfinitePowerMarketAcceptanceScienceChallengeStandardExtension(Amendments)MIMO1080p1080iAVStreamingSiPModuleSimpleWaytoSmartLife6StackInfinitePower

4、RadiobasicsFCCRadiofrequencyisanelectromagneticsignalwithafrequency inrangefrom3kHzto300GHzfrequencyf[Hz]wavelengthλ[m]λ=c/fspeedoflightc[m.s‐1]c=299792458m.s‐1SimpleWaytoSmartLife7StackInfinitePowerRadiobasicsHowtoconveyinformation?Modulation.9Carriersignal←modulateamplitu

5、de/frequency/phase 9Analog/digitalmodulation(AM,FM,ASK,FSK,…) 9Spreadspectrum(DSSS,FHSS,…)9Ultrawideband(PPM,THSS,CSS)WikipediaSimpleWaytoSmartLife8StackInfinitePowerRadiopropagation(1)Radiopropagation•Ground‐wavepropagation(f<2MHz) •Sky‐wavepropagation(f~2‐30MHz) •Line‐of‐

6、Sight(LOS)propagation(f>30MHz)¾Multipath: 9Reflection 9Scattering 9DiffractionSimpleWaytoSmartLife9StackInfinitePowerRadiopropagation(2)Channelcapacity9Datarate[bps] 9Bandwidth[Hz] 9Errorrate–BER,PER 9Noise–SNR,Eb/Nocnx.orgTheoreticallimit:ShannonformulaC=B.log2(1+SNR) C–ca

7、pacity[bps],B–bandwidth[Hz]Example:802.11nbandwidthB=40MHz,SNR=25dB,rate600Mbps C=40.106.log2(1+25dB)=40.106.log2(1+316)=332Mbpswhy??SimpleWaytoSmartLife10StackInfinitePowerRadiopropagation(3)LOSsignalimpairments: 9Attenuation,distortion 9Freespaceloss 9Noise–Thermalnoise –

8、Intermodulationnoise –Crosstalk–Impulsenoise9Atmosphericabsorption 9Multipath9Refr