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MSK Demodulation Simulation: Theory, Working & Waveforms

 

MSK Demodulation

Instructions for Minimum Shift Keying Modulation (MSK)

  • Note: Use the input fields to enter the number of bits, carrier frequency (Hz), and the baud rate (Hz)
  • Step 1: Click on 'Generate Message' button to generate input message signal
  • Step 2: Then click on 'Generate NRZ Signal' button to generate NRZ signal
  • Step 3: Click on 'Generate Carrier' button to generate carrier signal
  • Step 4: Click on 'Evaluate Baseband Phase' to view the baseband phase for MSK
  • Step 5: Click on 'Generate MSK Signal' button to generate Minimum Shift Keying Signal
  • In MSK, the frequency shift is half the baud rate. MSK represents the "1" bit with a frequency slightly higher than the carrier, fc + (baud rate)/4 and the "0" bit with a frequency slightly lower than the carrier, fc - (baud rate)/4.





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Minimum Shift Keying (MSK) Demodulation

The received MSK signal is split into two paths. One path is delayed by T_b and shifted by pi/2, then multiplied with the original signal. The product passes through an LPF and is sampled. A positive or negative output determines the transmitted 0 or 1.

Minimum Shift Keying (MSK) Demodulation (coherent)

The receiver correlates the received signal with the two possible signals: cos(2*pi* f_1*t) and cos(2*pi* f_0*t). Conceptually: 
                     ┌── Mixer with f1 ── Integrator ──┐
Received MSK ───────►│                                │
                     │                                ├──► Compare ───► Bit
                     │                                │
                     └── Mixer with f0 ── Integrator ──┘
If the f_1 correlator produces the larger output: 1
If the f_0 correlator produces the larger output: 0
Received MSK Signal Delay Tb π/2 Phase Shift Low-Pass Filter (LPF) Sample and Hard Decision Threshold = 0 1 0 Delayed MSK Direct (undelayed) MSK path
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