3_WCDMA关键技术

3-253.5........................................................3-133.4.2Turbo.........................................................3-103.4.1..........................................................3-83.4...............................................................3-63.3...........................................................3-53.2.3.....................................................3-43.2.2CDMA........................................3-43.2.1CDMA........................................3-43.2CDMA...............................................3-13.1RAKE............................................................3-1WCDMA........................................................WCDMAWCDMAiWCDMA3.1RAKECDMACDMACDMACDMARAKE3-1RAKECDMAQIIDLLIQ3-1RAKEDLL1/21/4WCDMAWCDMA3-13-2RAKE1/4-1/2RAKEmsCDMAI/QLPFI/Q3-2I/QI/QDMUXLPFLPF3-3LPFWCDMAWCDMA3-2NN-10NN-103-4RAKEASICDSPRAKERAKERAKEWCDMAWCDMA3-33.2CDMA3.2.1CDMARxIFADCI/OIQIFDACIQTxRFAGCRFAGC3-5CDMA3-5CDMARFAGCRxRFAGCADCDACWCDMA10%GSM3.2.2CDMACDMACDMACDMARFMask1dBWCDMAWCDMA3-4AGCLNAAGCWCDMAAGC80dBLNAWCDMALNA4dBADCDAC3.2.31.0fHm(t)1/2fHm(t)2fHfLfHm(t)B=fHfLfsm(t)1.fHnBnfs2B2.fHnBBn01fs2B1n3-6BM()fs2B1nMS()H()M’S()WCDMAWCDMA3-5IQ2.M()T()MS()fsfL2fsH()3-6IQttMttMtMQI00sin)(cos)()(ww-=02f0fs4f0ksIsKTMkTM)1)(2()2(-=ksqsTKMTkM)1)()12(())12((-+-=+3-7IQfs-1(-1)k(-1)kM(t)MI(KTs)MQ(kTs)3-7fs4f0WCDMAWCDMA3-63.31.102.3.4.1212121212123-83-812WCDMAWCDMA3-702468101212345678910dBk3-91.2.3.r3-9k1dB3.41MMYWCDMAWCDMA3-8RRMkknnn-k1k/nn/kn0W/HzBHzSWC)1(log02BNSBC+=ShannonRbit/sCRSEb=)1(log02BNREBCBRb+=bit/sHzBRr=rNErb120-∞→B0→rdBrNErb59.12ln120-=≥-0NEbShannon3-1ShannonWCDMAWCDMA3-9BPSKQPSK2.5-4.01.5-3.03.5-5.52.0-4.04.5-5.53.0-4.06.0-7.04.0-5.05.0-6.54.0-5.5Viterbi6.5-7.54.5-5.5RS6.5-7.55.0-6.08.0-9.06.0-7.08.5-9.56.5-7.5RSViterbi13.611.2dB@BER=10-5dB@BER=10-3Reed-SolomonBCHTurboWCDMATurboTurbonkN-1NNnNWCDMAWCDMA3-10zzb2b1c1c2b30/00bdca1/101/011/110/110/011/000/103-102123-102122n=2k=1N=2nN=4nkNb1b2b3000c1c2b1b2b3c1=b1b2b3⊕⊕c2=b1b3⊕aaaaaaa000000000000bbbbbbcccccddddd111111111111101010101010101010010101010000000001010101013-11trellis3-11abcdb2b3b101[11010]abdcb110101001011ViterbiViterbiViterbi1.5~2dBWCDMAWCDMA3-11Viterbi1M{m1m2mM}Y{y1y2yL}M/kL/nknR{r1r2rL})|()|()|(1jjLjyrpYRpMRpΠ===M∑===Ω=ΩLjjjyrpYRpYRMR1)|(ln)|(ln),(),(AWGNY11EsN0()()2ln21)(expln)|(ln011202/0012NnyrEnErNNNyEryrpunljljlnlssjlnnljlsjljjjpp-⎟⎠⎞⎜⎝⎛+-=⎭⎬⎫⎩⎨⎧⎥⎦⎤⎢⎣⎡--==∑∑∑===nka00a00b01b01c10c10d11d1145+6=510016+10=26112N2N=1634512151260051j3-123-12jjuWCDMAWCDMA3-12EsrjlN0=ju)∑=nljljlyr1∑==Ω=ΩLjjuYRMR1),(ˆ),(ˆ)RMY2L(N+1)NViterbi2N2NLACSL2N5~72N5~75~73~55~7ViterbiACS1.5~2dBWCDMAWCDMA3-133.4.2TurboShannonTurboBerrouGlavieuxThitimajshima1993Turbo1982UngerboeckShannonTurboEb/N00.7dBAWGN1/2Turbo10-5Turbo3-13TurboTurboSOVAViterbiMAPMAPViterbiMAPMAPLog-MAPMAPMAPTurbo12mtyt3-13Turbo1.MAPMAPBahlCockeJelinekRaviv1974ChangHancock1966R)|0()|1(log)(RmpRmpmtrtrt===Λt≤≤t1ttm⎩⎨⎧≥Λ=otherwisemifmtt00)(1)(tmΛ1M{m1m2mL}WCDMAWCDMA3-14Y{y1y2}Lm1tyt1yMarkovTs2NNS00tS=0RYt1r2s3-11tStmt1St1yt1nk13-111',0);'|()'|(1-≤≤===-stttTlllSlSpllp1',0);,'|(),'|(1-≤≤===-stttttTlllSlSypllyq0.50)'|(llpt'1lSt=-0.50lSt=)'|(llpt),'|(llyqtt103-105.0)0()0|1(==ppt5.0)1()2|1(==ppt0)0|2(=tp1)0,0|1,1(=--tq0)0,0|1,1(=+-tq1)2,3|1,1(=+-tqM{m1m2mL}S0=0tS=0t1ygt+=Lttrrrr,,,(211Λ=∏==ttt111)|()|(jjjyrRyrp∏==niijijjjyrpyrR0,,)|()|(n22,)1(,,21}1|(ssp+-=-=ijrijijreyrpWCDMAWCDMA3-1522,)1(,,21}1|(ssp--==ijrijijreyrp2smtSt1StytRMAPt1rR0mt)(tmΛ∑∑∈-∈-=======00)'(111)'(111)(),,'()|,'()|0(ttBllttBlltttrprlSlSprlSlSprmpttttmt=00tB'1lSt=-3-100,02,03,2lSt=0tB1,2∑∑∈-∈-=======11)'(111)'(111)(),,'()|,'()|1(ttBllttBlltttrprlSlSprlSlSprmpttttmt=00tB'1lSt=-3-100,12,13,3lSt=0tB1,3mt(APP)1,,1,0,'),,,'(),'(11-====-stttTllrlSlSpllΛts∑∈==0)'(11)(),'()|0{tBllttrpllrmptts∑∈==1)'(11)(),'()|1{tBllttrpllrmptts)(tmΛ∑∑∈∈=Λ01,','),'(),'(log)(ttBlltBllttllllmssMAP)(tmΛ)(tmΛWCDMAWCDMA3-16)(tm˟),'(llts),()(1tttrlSpl==a)|()(1lSrplttt==+tb1,0};'|,,(),'(1=====-ilSrlSimpllttttitg),'(llts∑∈----------+----+--+-⋅⋅========================)1,0(1111111111111111111111111111),'()()'()'|,()(),'(),'(),'|,()()',,,(}|()',,,()',,,|()',,,,(),,'(),'(iitttttttttttttttttttttttttttttttttttttttlllllSrlSplrlSprlSprlSrlSpllSlSrrplSrplSlSrrplSlSrrrplSlSrrrprlSlSpllgbabbstttt∑∑∈-∈-⋅⋅⋅⋅=Λ01),'(01),'(11),'()()'(),'()()'(log)(ttBlltttBllttttllllllllmgbagbaŸatΛ,2,1=t∑∑∑∑∑∑∑∑-=∈--=∈---=---=-----=---=-⋅====⋅===⋅===⋅==========10')1,0(110')1,0(1110'1110'11111110'11110'111),'()'()'|,,()'()'|,()'(),'|,(),'(),,,'(),,'(),()(ssssssTliittTlitttttTlttttTlttttttTlttttTlttttttllllSrimlSpllSrlSplrlSrlSprlSprrlSlSprlSlSprlSplgaaaat=01)0(0=a0≠l0)(0=laŸb0,1,,1Λ-=ttWCDMAWCDMA3-17∑∑∑∑∑∑∑∑∑∑∑-=∈++-=∈++++-=+++-=+++-=++++-=+++++-=+++-=++-=+++⋅====⋅===⋅===⋅==⋅====⋅=====⋅================10')1,0(1110')1,0(111110'11110'11110'111210'1111210'11210'1110'111)',()'()|,,'()'()|',()'()()()|',()'()(),',()'|()(),',(),',|()(),',,()(),,'()|,'()|()(sssssssssTliittTlitttttTlttttTlttttttTlttttttTlttttttttTltttttTlttttTlttttttllllSrimlSpllSlSrpllSplSplSlSrpllSplSlSrplSrplSplSlSrp