2Ask,2Fsk,2Psk波形产生和功率谱分析产生

功率谱图Рtitle('2ASK功率谱');Рfigure(2)Рsubplot(3,1,1)Рplot(step,signal);grid on %随机信号作图Рtitle('随机信号');Рaxis([0,10,0,1.2]);Рfsk=sin(2*pi*step.*(signal+ones(1,1000))); %2FSK计算Рsubplot(3,1,2)Рplot(step,fsk);grid on %2FSK波形作图Рtitle('2FSK信号调制');Рwindow=boxcar(length(fsk)); %矩形窗Р[Power,f]=periodogram(fsk,window,nfft,Fs); Рsubplot(3,1,3)Рplot(f,10*log10(Power));grid on %画功率谱图Рtitle('2FSK功率谱');Р Рfigure(3)Рsubplot(3,1,1)Рplot(step,signal);grid on %随机信号作图Рtitle('随机信号');Рaxis([0,10,0,1.2]);Рpsk=sin(2*pi*step.*(signal.*2-ones(1,1000))); %2PSK计算Рsubplot(3,1,2)Рplot(step,psk);grid on %2PSK波形作图Рtitle('2PSK信号调制');Рwindow=boxcar(length(fsk)); %矩形窗Р[Power,f]=periodogram(fsk,window,nfft,Fs); Рsubplot(3,1,3)Рplot(f,10*log10(Power));grid on %画功率谱图Рtitle('2FSK功率谱');Р作图结果:Р2ASK波形产生与频谱分析:Р2FSK波形产生与频谱分析:Р2PSK波形产生与频谱分析: