通信专业实务(中级)传输与接入专业2015真题解析

ScannedbyCamScanner5.42015(15)1(71(n))(1)(2)(3)(4)(5)(6)G653(7)1550nmu2(31(n))(1)(2)(3)351y()x())(1)((2)850nm1310nm1550nm((3)(IMDD)((4)((5)(1G653G653(DSF)1550nmDWDMFWM2(SRS)(SBS)(SpM)(XPM)(FWM)ScannedbyCamScanner3l(1)()(2)1085nm2130nm(S)3155nm(C)1611620nm413501450nm515281545nm13501450nm(3)(IMDD)/PCM(4)(5)1(1)()(2)()(3)()(4)()(7)(DSF)(5)(6)2(1)(2)(SRS)(3)(SBS)(2)(3)ScannedbyCamScanner3(15)1(41(n))SDHSTMN(1)2SDH(3)(4)2(71(n))(a)ASON(1)(2)(b)(MSTp)(3)ppp/HDLcGFpc45STMN(c)WDM(6)(7)3(4)1550nm02dB/km?1SDHSDHSDHSTMNSDH()()2ASONMSTPDWDM(a)(CP)(TP)(MP)(DCN)ASON(CCI)(b)MSTp(LCAS)PPP/HDLCLAPSGFP.ScannedbyCamScanner()STMNSTMN(c)DWDMX0×C)(ÒADM)OADMSDH/(AUM)jVB3çrAJL1IOADM@0×Cd0×C®®(OADM)(0×C)O×COADM0×C''a(Â)=0lgl_lg2=0.2dB/fo?1P.1(1)(2)()(3)()(4)2(1)(CP)(2)(MP)(3)()(4)()(5)(6)(OADM)(7)(0×C)(6)(7)3ScannedbyCamScanner3dB,101ogio05=3(dB)3=02=15(km)L=15(km).(15)1(31(n))HFC(1)(2)HFC(32(71(n))(I)(PON)pONEthernet(2)GEM(3)PONONU(4)(5)(6))3(51(n))(1)1550nm(2)12791670nm(3)4)(5)1HFC(HybridFiberCoax,HFC)(HFC)HFCHFC()SCM.2PON(OAN)(AON)(PON)AONScannedbyCamScannerpONEPONGPONPONFITxEPONpoN.EthernetIPGpONGEM,ATMQosPON0NU0LTTDMA()WDMA()CDMA()SCMA()3()(EDFA)(PDFA)SBASRAEDFA1550nmPDFA1310nmSRA1279^1670nm(1)()(2)()(3)(scM)in2(1)(AON)(2)EPONScannedbyCamScanner3(1)(EDFA)(2)(SRA,FRA,RFA)(3)(4)()(5)(3)(4)(5)(20)1(151()())(1)3GHzlm((2)(3)((4)TDMA((5)SDMA.((6)((7)((8)LTEOFDMTDMA.((9)((10)((11)Mv10((12)GSM((13)((14)G1((15)(2)(5)L=3244+20lgd+20lgfdB,GSM900DCS1800dB?1(1)=/3GHz3x108m/s3×109us=0Im(2)ScannedbyCamScanner(3)(4)(TDMA)()()TDMA(5)(SDMA)SDMA(6)(7)HD2BScannedbyCamScanner(8)LTEOFDMTDMA.(LTEOFDMA,FDMA,TDMA,SDMA.SCFDMA.(9)(AMC)(HARQ)ARQFECFECHARQHARQAMCHARQAMCHARQ(10)(11)MIMO()(12)GSMGSM(FCA)a«*1Atx&L(13)ScannedbyCamScanner(14)G/TGTG/TGG/T(15)174°45°2GSMLpLp-3244+20lgd+20lgfGSM900DCS1800GSMGSM900900MHZDCS18001800MHZ1DCS1800LGSM900-201g1800201g900=201g2-6dB(4).GSM900DCS1800DCS1800GSM9006dB.1(1)x(2)VScannedbyCamScanner2)S1800LGsM9oo-201g1800201g900=201g2.6(dB)(4)DC81800GSM9006dB.(15)1(71(n))91)(2)(3)(4)(5(6)(7)ABCDEFGHIJLMN2(81(n)(1)(2)(3)(4)(5)(6)(7)dBm(8)ABCDEF)1ScannedbyCamScannerK4131KO,O1.2)()()12dB()()(75%)=x(dB)(dBm)P,-)..+101gR174++(1)P.Æ()..N0R(Hz)CDMA(2)ScannedbyCamScanner()Lp(dB)-9244+201gd(km)+20lgf(GHz)Lp(dB)-3244+201gd(km)+20lgf(MHz)(3)12dBm3LdB,df1dd1(1)N(2)H(3)K(4)D(5)F(6)(7)C2(1)A(2)B(3)A(4)A(5/F(6)C(7)D(8)D(20)1(6)GSM4×3l×3?2(41(n))ABnln2(1)(2)nln2(3)(4)ScannedbyCamScanner,(km)t£v,(1m1)A'B3(5)CDMA4(5)10kHz,128MHz?1·GSM.l×3l×3DTX2(50km)ABnln2BAn22635ScannedbyCamScannern3516184623n1n2ABA3CDMARLP()FER1%FER5%FER3%4(DirectSequenceSpreadSpectrum)(DS)x10kHz=_00078125128MHz128(00078125.00078.0008001))1l×3l×3/(4×3)2(I)B(2)AScannedbyCamScanner