https://au.mathworks.com/help/comm/ref/comm.oqpskdemodulator-system-object.html
comm.OQPSKDemodulator - Demodulation using OQPSK method - MATLAB
The comm.OQPSKDemodulator object applies pulse shape filtering to the input waveform and demodulates it using the offset quadrature phase shift keying (OQPSK)...
commdemodulationusingmethodmatlab