第18讲 频带传输：DQPSK、矢量表示、MASK调制

1、43474540232tttcccsinsincoscos)cos(1nnnfdf111 cos1 sin2cossin22cccctttt 1cos21sin2 7472cos()4ct11nnef1nnnfdf1nnnece1nnnfde1nnnecf011, 101 111 cos1 sin2cos() sin22cccctttt 5452cos()4ct5102cos()4ct7012cos()4ct5734422 02324347454327434454( )( )cos()cks tg tt( )cos( )cos()cos11( )cos 2( )cos22cckcckks tt

2、g tttg ttg t1( )cos2kg t1( )sin2kg t4345474coskksink3、n维空间：维空间：矢量正交概念矢量正交概念则称这两个矢量正交则称这两个矢量正交021 AA1、平面空间：若矢量、平面空间：若矢量2、三维空间：、三维空间：0()ijAAij正正交交。则则称称321,AAA若矢量若矢量1,2,3;1,2,3ij)(0jiAAji正交。则称nAAA,.,21若矢量若矢量1122AC AC A112233AC AC AC A1122nnAC AC AC A,1,i jn 0( )( )0,1, Tjkjjktt dtKtTj kN 1,0, jkjkjk20(

3、 )TjjjEt dtK1( )( )Nkkks tst( )( )( )e ts ts t221( )( )( )eNkkkEe t dts tstdt1( )( )( )0NekknknEs tstt dts11( )( )( )( )( )( )( )( )0NnnkkkNnnkkks tttstdts tt dttst dt01,( )( )0,Tjkjktt dtjk ( )( )nnss tt dt2221112222111min()( )( )( )2 ( )( )( )( )2( )( )( )( )NNNekkkkkkkkkNNNkkkkkkkkEs tstdts ts ts

4、tstdts t dts tst dtstdts t dts221( )Nkks t dts1( )( )Nkkks tst11212( )( )2( )( )2NNkkkkkkNkks tst dtss tt dts21221,1,2221,1,1( )( )2( )( )( )2( )( )NkkkNNkkkkjjkk jkjNNNkkkjkjkkk jkjkstdtstst stdtst dts stt dts111112211211( )( )( )( )( )( )( )( )( )NNNNMMMNNs tststs tststststst 1( )( ),1,Niijjjs tst

5、iM ,s11iiNiissskmkmmkEEdttsts)()(mkmkmkssEEmkmmkmkmmkEEEEdttstsd2)()(2mkssmkd1122( )cos( )( )0csEs tts tTs t221( )Nkks t dts211( )ss t dtEtTtcscos2)(12 ()iskiT112222( )cos ( )cosbbssEEs tts ttTT0( )( )sTininss tt dt112( )cossttT222( )cossttTbbEsssEs22211211, 00,)()()()()()(22212122121111tstststststs

6、12,00,bbsEsE333( )( )v ttv111( )( )v ttv00211( )stTtvv t dt222( )( )v ttv002121(,)( )( )stTtss tt dt0021( )1stTtt dt1020( )cos2,0( )sin2,0sss tAf ttTs tAf ttT 110( )( )cos2v ts tAf t222211000( )( )cos 22ssTTsA Tv tv t dtAf tdt011021cos2( )2( )cos22ssAf tv ttf tvTA T22211( )( )(,)v ts ts 212100002(,)( )( )( sin2)cos(2)0ssTTsss tt dtAf tf t dtT220( )( )sin2v ts tAf t22( )2sA Tv t202( )sin2stf tTtAnTtgascnsTnMASKcos)(MittgatscTii, 2 , 1 ,cos)()(11( )( )cosTcv ta gtt111( )cos2( )( )cosTcTcga gtttgttvE1110( )cos)2sTgTcEva gtt dta