https://www.mathworks.com/help/phased/ref/mfskwaveform.html
MFSK Waveform - Multiple frequency shift keying (MFSK) continuous waveform - Simulink
The MFSK Waveform block generates a multiple frequency-shift keying (MFSK) continuous waveform with a specified step time, sweep bandwidth, frequency offset,...
frequency shift keyingmfskwaveformmultiplecontinuous
https://www.arrl.org/mfsk-spec
MFSK Spec
The American Radio Relay League (ARRL) is the national association for amateur radio, connecting hams around the U.S. with news, information and resources.
mfskspec