数字通信基础-仇佩亮-课后答案[1-8章].khdaw

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12008-3-211-1ABCD41/21/41/81/8[]1()log()1111log2log4log8log824881133228831(bits)4HXEpX1-301011/210[]XY(0)(1)0.5pXpX(0|0)(1|0)0.5pYXpYX(0|1)0pYX(1|1)1pYX(0,0)(0,1)0.25pXYpXY(1,0)0pXY(1,1)0.5pXY(0)0.25pY(1)0.75pY00110.50.51XY(0)(1)0.5(0)(1)0.5(0)(1)0.5(0)(1)0.5(0)(1)0.5(0)(1)0.5(0)(1)0.5(0|0)(1|0)0.5(0|0)(1|0)0.5(0|0)(1|0)0.5(0|0)(1|0)0.5(0|0)(1|0)0.5(0|0)(1|0)0.5(0|0)(1|0)0.5(0|0)(1|0)0.5(0|1)0(0|1)0(0|1)0(0|1)0(0|1)0(0|1)0(0|1)0(0|1)0(0|1)0Y(0|0)(1|0)0.5(0|0)(1|0)0.5(0|0)(1|0)0.5(0|0)(1|0)0.5(0|0)(1|0)0.5(0|0)(1|0)0.5(0|0)(1|0)0.5(0|0)(1|0)0.5(0|1)0(0|1)0(0|1)0(0|1)0(0|1)0pYX22222222(,)(;)log()()0.250.250.50.25log0.25log0.5log0.50.250.50.750.50.750.250.250.25log310.5log31.50.75log3(bits)pXYIXYEpXpY2(;)()(|)1(1)(|1)110.7531.50.75log3(bits)=0.3113(bit)IXYHXHXYpYHXYh()log(1)log(1)hxxxxx1-5125s[]=61/(12510)=3810Baud=3810log4=31610bits/s125ssbits/s12-350Hz()xt1,40()1,040,snxnTn(1)(0.005)x(2)(1)()()sinc2()sskxtxkTWtkT10.01()2sTsW41(0.005)sinc(0.5)sinc(0.5)kxkksinc(0.5)sinc(4.5)sin(0.5)sin(4.5)0.5660.54.5(2)sinc(),0,1,stkTk2218()()100100skExtdxxkT2-110()sinc()cos2xttft20()sinc()sin2httft()yt00ˆ()sinc()cos2()sinc()sin2xttftxttft()sinc()lxtt2200ˆ()sinc()sin2()sinc()cos2httfthttft22()sinc()jlhtte()()()()ExtdxxkTExtdxxkTExtdxxkTExtdxxkT()()()()()()2222ExtdxxkTExtdxxkTExtdxxkT22()()()()()()2222ExtdxxkTExtdxxkTExtdxxkTExtdxxkT()()()()()()()()ExtdxxkTExtdxxkTExtdxxkTExtdxxkTExtdxxkT()()()()100100()()()()()()()()0.5660.566sinc(),0,1,sinc(),0,1,sinc(),0,1,sinc(),0,1,sinc(),0,1,sinc(),0,1,sinc(),0,1,sinc(),0,1,sinc(),0,1,sinc(),0,1,sinc(),0,1,222218182222222222()()()()222222222218()()()()()()()()22222222()()()()22222222()()()sinc()cos2()sinc()cos2202()Re()jftlytyte()()()lllytxtht1()()()2lllYfXfHf112()102lfXff(1)/01()(1)/10lfjfHffjf1(1)/202()1(1)/202lfjfYffjf12212()()jftllytYfedf1022210211(1)(1)22jftjftfedffedfjj2222sin111sin(cos)222ttttttt222211sin(1cos)sin(cos1)4444jjttjtttttt02211()(1cos)sinsin(2)44ytttfttt2-19()t()2cos(2)tt(0)(/2)1/2PP[()]Et(0,1)R[()](0)2cos(2)()2cos(2)22cos(2)sin(2)EtPtPtttsin(1cos)sin(cos1)sin(1cos)sin(cos1)44444444sin(1cos)sin(cos1)sin(1cos)sin(cos1)44444444sin111sin111222222sin111sin111sin111tttttttt222222sin111tttttttt222jjjjsin(1cos)sin(cos1)sin(1cos)sin(cos1)444444444444tttttttt444444444444sin(1cos)sin(cos1)sin(1cos)sin(cos1)jjjjsin(1cos)sin(cos1)sin(1cos)sin(cos1)sin(1cos)sin(cos1)sin(1cos)sin(cos1)4444444422sin(1cos)sin(cos1)sin(1cos)sin(cos1)22sin(1cos)sin(cos1)sin(1cos)sin(cos1)224444444422002222002edffedfedffedf1(1)jjjj22222222222222edffedfedffedf1(1)(1)edffedfedffedf2222(1)2222edffedfedffedfedffedf22jj22edffedf220002222001122222222222222edffedfedffedfedffedfedffedfedffedf222222sin111sin111sin(cos)sin(cos)sin111sin111sin(cos)sin(cos)sin(cos)sin(cos)sin(cos)222222sin(cos)sin(cos)sin(cos)tttttttt222222sin(cos)sin(cos)sin(cos)sin(cos)sin(cos)sin(cos)sin(cos)sin(cos)sin(cos)sin(cos)sin(1cos)sin(cos1)sin(1cos)sin(cos1)jjjjsin(1cos)sin(cos1)sin(1cos)sin(cos1)sin(1cos)sin(cos1)sin(1cos)sin(cos1)sin(1cos)sin(cos1)sin(1cos)sin(cos1)sin(1cos)sin(cos1)sin(1cos)sin(cos1)22tttttttt444444444444sin(1cos)sin(cos1)sin(1cos)sin(cos1)sin(1cos)sin(cos1)sin(1cos)sin(cos1)sin(1cos)sin(cos1)sin(1cos)sin(cos1)2222sin(1cos)sin(cos1)11111111()(1cos)sinsin(2)()(1cos)sinsin(2)1111()(1cos)sinsin(2)()(1cos)sinsin(2)()(1cos)sinsin(2)()(1cos)sinsin(2)()(1cos)sinsin(2)44()(1cos)sinsin(2)()(1cos)sinsin(2)()(1cos)sinsin(2)3(0,1)[2cos2cos(2)]5(0)4()4coscos2222REPP2-250/2NcfBP2-25P2-251202022()()202cNcNBffNPfHfBff2()()jfNRPfedf0sinc()cos(2)cNBBf020NB2221()exp22Nnfn2-30()t()RP2-30[]()()()YtttT0fc-fcfBB|H(f)|()()()()NNPfedfPfedf()()()()()()NN()()()()()()()()00NBBfNBBf002222c22cBBff22c22BffffcffffffPfedfPfedfjfjfPfedfjfsinc()cos(2)sinc()cos(2)sinc()cos(2)sinc()cos(2)sinc()cos(2)sinc()cos(2)sinc()cos(2)sinc()cos(2)sinc()cos(2)0412112212121212[()()][(()())(()())][()()][()()][()()][()()]2()()()EYtYtEttTttTEttEtTtEttTEtTtTRRTRT22()[2()()()]()(2)2()(1cos2)YjfTjfTPfRRTRTPfeePffT2-35()Xt()Yt00ˆ()()cos(2)()sin(2)YtXtftXtft0f[0,2]()Xt()XtP2-35()YtP2-350ˆ()()cos()sincos2YtXtXtft0ˆ()sin()cossin2XtXtftˆ()()cos()sinZtXtXtˆˆˆˆˆ()()cos()sin()sin()cosZtXtXtXtXt00ˆ()()cos2()sin2YtZtftZtft()()()YREYtYt00ˆ()cos2()sin2ZZRfRf22()()cos()sinZXXRRRˆˆ()()cossin()()cossinEXtXtEXtXt()XRAB-B0fPX(f)()()cos()sincos2()()cos()sincos2()()cos()sincos2()()cos()sincos2()()cos()sincos2()()cos()sincos2()()cos()sincos2()()cos()sincos2()()cos()sincos2()()cos()sincos2()()cos()sincos2()sin()cossin2()sin()cossin2X()sin()cossin2()sin()cossin2()sin()cossin2()sin()cossin2()sin()cossin2X()sin()cossin2()sin()cossin2()sin()cossin2()sin()cossin2()sin()cossin2tXtfttXtft()sin()cossin2()sin()cossin2()sin()cossin2()sin()cossin2()sin()cossin2()sin()cossin2XX()sin()cossin2()sin()cossin2()sin()cossin2()sin()cossin2()sin()cossin2()sin()cossin2XX()sin()cossin2()sin()cossin2()sin()cossin2()sin()cossin2()sin()cossin2()()cos()sin()()cos()sin()()cos()sin()()cos()sin()()cos()sin()()cos()sin()()cos()sin()()cos()sin()()cos()sin()()cos()sincos2()()cos()sincos2()()cos()sincos2()()cos()sincos2()()co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