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matlab awgn psd generation

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mohammadriyaz.g

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i wanted to add awgn of -140db to the ,psd of other signals in matlab .How to generate or add awgn of -140 db to that psd.I don't have any snr value to use awgn(x,snr )function.plz suggest me
 

1. convert -140dB into linear scale. Say it is NoiPow

2. let Sig is a vector containing your other signals

3. In Matlab type

Noise = [randn(1,length(Sig))+j*randn(1,length(Sig))]/sqrt(2);
NoisySignal = Sig + Noise*sqrt(NoiPow)


I hope I have not made a mistake here.


by the way, a noise of -140dB is too small. I wonder how much power your signal has. If it is large -140dB should not cause you any trouble.
 

what is "j" (red colour)in the given noise expression?

Noise = [randn(1,length(Sig))+j*randn(1,length(Sig))]/sqrt(2);
 

can u tell me whats the significance of the 'complex' noise?
 

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