matlab simulink跳频扩频仿真 程序源码.zip

Ts=0.00001; fs=1/Ts; EndTime=2-Ts;%2s?? %产生信息序列 Tm=0.25;fm=1/Tm;%码率? [u,time]=gensig('square',2*Tm,EndTime,Ts); y=2*(u-0.5); figure(1) plot(time,y); title('信息序列') xlabel('time?(seconds)') axis([0 2 -2 2]); T0=0.1;f0=1/T0;T1=0.2;f1=1/T1; [u0,time]=gensig('sin',T0,EndTime,Ts); [u1,time]=gensig('sin',T1,EndTime,Ts); y0=u0.*sign(-y+1); y1=u1.*sign(y+1); SignalFSK=y0+y1;%?FSK信号 %FSK调制的频谱 nfft=fs+1; Y=fft(SignalFSK,nfft); PSignalFSK=Y.*conj(Y)/nfft; f=fs*(0:nfft/2)/nfft; figure(2); plot(f,PSignalFSK(1:nfft/2+1)); title('FSK调制后的频谱'); xlabel('frequency?(Hz)'); axis([0 100 -inf inf]); fc=1000;Tc=1/fc;%频点:?1000? [Carrier,time]=gensig('sin',Tc,EndTime,Ts); %产生扩频载波 MixSignal=SignalFSK.*Carrier; figure(6); plot(time,MixSignal); title('混频后的波形'); xlabel('time?(seconds)'); axis([0 2 -2 2]);