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Hi
In terms of ISI tolerance and BW efficiency , GMSK is better than QPSK.
That's because of using the Guassian pulse in GMSK ,which has a more smooth transition and hence less out of band radiation , and hence less interference compared to the rectangular pulse used in QPSK.
because of minnimum phase shifts in MSK , the bandwith efficiency is better than QPSK , which has a maximum phase shift of ±180°.
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