hello to All.
as part of my work i want to add AWGN in my matlab program .
it can be easily done by randn function.
like this
Noise = ( randn( 1,data ) + j * randn( 1,data) )
but my teacher told me once that multiply it also with
*10.^(SNRdb/20)
to normalize the Energy to 1 !
can any one explain it what is meant by Normalization the energy to one ???
it is not enough to just add noise, but add noise whose power is as required by given SNR. The given multiplying factor ensures that the power of added noise is as reqiured.
- b