I facing a problem in GSM simulation. I am having a perfect GMSK modulated (I can assume that GMSK filter is 200kHz or 270 kHz band limited) signal in Tx path adding AWGN of 6dB SNR (Noise 6dB below Signal). I am passing this through a baseband filter at receiver of 160 kHz. I am ok with the signal distortion due to stricter LP filter then signal bw but I want to estimate SNR at output of the filter.
Shouldn't I get an improvement of 10*log10(270000) - 10*log10(160000) in dB. Even if yes, what are the steps to reproduce and check the estimate the same feeding some known GMSK signal