搜索
`()【】()..。(OQPsK)、—(IJFoQPSK),(MSK)。。【】AnalysisofModenTeehniquesinMobileSatelliteCommunieationZhangXiannlilLiWeidong(1’IIE6lTI」RESEARCllINSI’ITUTEOFTIE}IEADQUAITERSOFTllEGENERALSTAFF)Abstraet:Inhelighrofthefeaturesofb11d1111、irtio1andno11)erity,thepaperdiscussesseveralProperdigitalModerrteehniqJtssueh15OQPSK,IJFOQI,SK.MSKanolMotlenlreehniqueeonbinedwit}1encode·ThePelfornlanceoftheseModel1techlliquestreanJ)’Zetl、vithconlpariso1·Keywords:rllobilesatellitecoll、11、uzlieutioli,Modenztechniquc、,。、,,,。,,,,,608d0B。,i。,、;、。,(skHZ),。,。,、。、();994530L。Co,,。,n、nieut。,`。’e(hnoloDe,elo,,`。,`t0.21`J,515,,。。:·,,。·,,,AM/PM,。·,,IQ。:·;·,。,(),。,。。,,,,,()。。f=ll。,。(QPsK):QPsK,。,。/d。/2。,QPsKPsK。lQPsK,2T(t)=u:`eoswct+u,K:`’.l)Tbt(Zkl)Tb51llwet(Zk,900}80“。,I、Q。。cos(。、+、)。)51。(。i+。。)。。。。。,,。.。,14“,102。,。,,1ZdB。(1)(oQPsK)QP-」619952sK,T。,2,,0、:2/,180。,QPsK。,,,,。QPsK。(2)—l{T.=ZT。-OQPSKQPSKiii!’:::}}}}}·l!!!......!!!!!……IIIII{{{11---2oQPsKQPsK(xJFoQPsK),,uFuF,oQPSK。’3。5,。,/d,:/2,。,。,,,。,uF,。QRZQZ`Q:`IY。(t)Y:(t)-~}--/20./2—T.3IJFoQPs(3)(MsK),,co,,。、nioutn`’。e。02。&z)。,ezo,,`。,`t。.2J“”。,MsKBPSK。,,,。.MsKDMsK。(4)DMSK.,,。DMsKIT(T)ITZT。,(SEe)。4DMsK,SEc,,K。DMSK,。,。,。MsAT,。(Do-QPSK),199517,。5。DoQPsKsEcDMSKSEeldB。,,。,50%,13%。6ooQPsK。,DMsK。(5),l,2。1E。/N。(dB)))PPPPPPPe10Pe10555QQQPSKOQPSKMSKSFSKKKPeee8.4449.555ZZZoPsK()))z/2(1erfZ)\E。/N。)))8.66611666ZZZDPsK()))1/Zexp(E。/N。)))9.33310.333IIIJFOQPSKKKPe+0.3dBBB8.7779.888GGGMSK(BdT0.25)))Pe+0.7dBBB9.11110.222TTTF444Pe+ldBBB9.444]0.5552、((((((()))))))))))))))))))))))))))))))))))))))))))BBBPSKKK0、。///T///QQQPSKKK0、/2、。f’OOOQPSKKK0、。/2MMMSKKK.oQPsK///T(///】.5;;;;;;)))))))fffffff”SSSFSKKK,MsK;//////,10“MOROSOOOOOMSKKKKKKKKKKKKKIIIJF——()))oQPsK;_[[[///OOOQPSKKKKK10“GGGISKKKMsKTFMMM3dBBB////////、。,!8,。,,。TCM()。19352n/(n+1),2”+’,。2n,。,,。TcM,,(0);。,。TcM,,。7“”R。,Rbn/(n+1)Rb,“”()。,“”。(Pe-10“):12/2B;15d7B;1/21dZB。,,,。……·\KsdB\、’。d“\OK\\\`’DMSKSCEPsK(K)K。〕68101214156810121416E。/No(dB)DMsK[5DoQPSK111010(~10o102030…50160`.~~~~~6000.51.52,02,52.53.03.5~~~~--4.04.5a()3.0600.51.52.0(b)DOQPSKCo;,:。。,`ni“:t。,`se。:020。,ezo,,`。,`t。.215197MDsKPTcM、。。,。,、,。,、。,,。,、、、。。,、。,。l102d5B(10020OMHz)。(200500),d6B(5%10%),(20“)。,,,。,。,,、、。l2/1/d,,,。,。,,、、,。.」」`、、,BPsK/QP-sK,Motorola“”QPsK()。,。,QPSK。.。,,。,。「1」、、,,,198719952