M-FSK Demodulator with Doppler shift

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Al
Al on 15 Feb 2019
Dear all Mathworks staff,
I am trying to simulate Doppler Shift on M-FSK modulation.
I faced a weird result: the output bits are flipped for some special Doppler shifts!!!
I do not know anything more than the demodulato algorithm is just noncoherent.
I attach a simpler simulink file.
regards,
Al

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