Hi , please what is the difference between randn and awgn , when adding white gaussian noise to get snr = 10dB , also I see difference in result when using snr function .

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Mohamad
Mohamad 2019-3-20
P_rms = rms(signal)^2; %
noisy_signal_1 = awgn(signal,10,'measured');
noisy_signal_2 = signal+0.1*P_rms*randn(L_t,1);
snr1=snr(signal,awgn(signal,10,'measured'))
snr2=snr(signal,noisy_signal_2)
var1=var(noisy_signal_1);
var2=var(noisy_signal_2);

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