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just a data comms related question:

When modelling a communication channel we normally include AWGN, that is, Additive white gaussian noise.

Can anybody tell me why we use white noise in the model. I know it has a constant power spectral density for all frequencies - but how does this help us or make things better?

Also, apperently the DC component( mean) of the noise signal is zero - is this because we use the Gaussian distribution? i.e. how to we get it to equal zero?

thanks very much

John