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2PSK数字信号的调制与解调 图文.doc

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文档介绍:2PSK数字信号的调制与解调_图文%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%带通滤波后输出%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%a=[100.7305];%[10p]b=[0.1350-0.135];%gain*[10-1]faskn=filter(b,a,askn;figure(2subplot(321;plot(t,faskn;axis([0100e-6-22];title('通过带通滤波后输出';gridon;cm=faskn.*car;%解调subplot(322;plot(t,cm;axis([0100e-6-22];gridon;title('通过相乘器后输出';%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%低通滤波器%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%p=0.72;gain1=0.14;%gain=(1-p/2Hz1=gain1*(z+1./(z-(p;subplot(323;Hz1(Hz1==0=10^(-8;%avoidlog(0plot(f,20*log10(abs(Hz1;gridon;title('LPF-3dBresponse';axis([05e4-31];%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%滤波器系数%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%a1=[1-0.72];%(z-(pb1=[0.140.14];%gain*[11]so=filter(b1,a1,cm;so=so*10;%addgainso=so-mean(so;%ponentsubplot(324;plot(t,so;axis([08e-4-3.53.5];title('通过低通滤波器后输出';gridon;-15-%Comparator%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%判定并输出波形%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%High=2.5;Low=-2.5;vt=0;%设立比较标准error=0;len1=length(so;forii=1:len1ifso(ii>=vtVs(ii=High;elseVs(ii=Low;endendVo=Vs;subplot(325;plot(t,Vo,title('解调后输出信号',axis([02e-4-55]gridon;xlabel('时间(s',ylabel('幅度(V'set(gcf,'num','off','name',['系统信号解调波形'...blanks(10];%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%系统调制信号频谱%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%T=t(end;df=1/T;N=length(ask;f=(-N/2:N/2-1*df;figure(3%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%信源频谱%%

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2PSK数字信号的调制与解调 图文.doc

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2PSK数字信号的调制与解调 图文.doc

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