Optimum Filter Signal Detection for Non AWGN Channels I have been reading this question and it confirms that the matched filter is the maximum-likelihood receiver in the presence of additive white Gaussian noise. So  in the AWGN channel it maximizes the signal-to-noise ratio at the decision instant at the end of each symbol.

However,according to Wikipedia 


  AWGN channel is not a good model for most terrestrial links because of
  multipath, terrain blocking, interference, etc.


I would like to know:


If the transmission channel could not be considered as affected by AWGN. Which filter would yield the optimum SNR? I'm particularly  interested in the noise present in sound channel (sound channel through air not underwater).
Is it possible to "adapt" matched filter to non AWGN channels?
AWGN is a specific noise model that is to varying physical circumstances, of varying utility.

Not AWGN is not a specific noise model, but you can look at it as detection not dependent on Gaussian assumptions.  There is no one kind of optimal detector for every kind of non Gaussian noise.  

A good book is

https://books.google.com/books/about/Signal_Detection_in_Non_Gaussian_Noise.html?id=tvpSAAAAMAAJ&amp;hl=en

Multiplicative noise is another class as well.