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I want to know AWGN in matlab.

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mcpark

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I want my codes to pass through AWGN channel in MATLAB.

MATLAB have a function, AWGN

case1 : y = awgn(x,snr)
case2 : y = awgn(x,snr,sigpower)
case3 : y = awgn(x,snr,'measured')
.
.
.

Accoding to the Description, using case1 power of x must be 0 dBW. why do that?
Why power of signal is to be zero??

also when power of signal is not zero, How happen?

sincerely
 

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