i want to simulate a system that uses ask,fsk ,psk in Matlab with additive Gaussian noise for each mode . figure shows the system propti and Eb/N0=6db my question is how to calculate the standard variation of the Gaussian noise for each mode , i tried the following :
EbN0dB=6;
EbN0=10^(EbN0dB/10);% db to linear scale
EN0=1/(EbN0);
sigmaASk=sqrt(N0);% siqma for bask
siqmaPsk=sqrt(2*N0);% siqma for bask
sigmaFsk=sqrt(N0(1-sinc(4*1000*0.001);
mff=transmitted+sigma*randn(1,10*30);%modulated 10 bit signal plus
noise