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- Ts=10^4;
- SNR_dB=[-3 0 3 6 9];
- Ne=zeros(1,length(SNR_dB));
- for i=1:length(SNR_dB)
- SNR=10^(SNR_dB(i)/10);
- for t=1:Ts
- s=((sign(rand()-0.5))+1)/2; %create the "on"signal or "off" signal ."on"signal=1,"off" signal=0
- r=randn(2,1)./sqrt(2.*SNR); %it seems that it is noise
- if (s+r)>0.5
- s_hat=1;
- else
- s_hat=0;
- end
- if abs(s_hat-s)>0
- Ne(i)=Ne(i)+1;
- end
- y=Ne./Ts;
- end
- end
- Pe=zeros(1,5);
- for i=1:5
- SNR=10^(SNR_dB(i)/10);
- Pe(i)=erfc(sqrt(SNR/2)/(2^0.5))/2;
- end
- semilogy(SNR_dB,y,'-r',SNR_dB,Pe,'-k')
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