MATLAB: About GMSK demodulation

Question

Hi all,

I just got a doubt which remains as a doubt even after going through few books. Is GMSK demodulation same as the MSK demodulation and can I use the same process in Matlab too, or will there be gaussian filter in GMSK demodulation ?

Please help me in this regards. Any help would be much appreciated.

Thanks and regards,

Raj.

Answer 1

You 'can' use an MSK demodulator for demodulation of a GMSK signal but it will sub-optimal. A Gaussian filter needs to be there at the receiver for matched filtering.

You can either run Monte-Carlo simulations to asses the BER penalty v/s reduction in complexity obtained by using sub-optimal MSK receivers or you can try to search for existing papers on the topic.

I've run into sub-optimal OQPSK receivers being used for SOQPSK signals several times and I suppose the same theory should apply for GMSK as well.