GFSK is an evolution of FSK (read FSK first, then come back).
GFSK modulation is used in many modern communications technologies, i.e. Bluetooth, DECT, some WiFi.
Put short, while FSK works with simple On/Off signals similar to square waves, feeding the signal through a gaussian filter produces smoother transitions. These in turn have important electromagnetic advantages.
Benefits
- Efficiency: GFSK requires less bandwidth and increases spectral efficiency. As a direct consequence, this also conserves energy and requires less power to transmit the same information.
- Less Interference: there is a smoother transistion between 1 and 0 states, reducing spectral splatter and adjacent channel interference.
- Stability: Smoother frequency transitions and reduced interference in turn reduce noise and allow reliable data transmission even at high speeds.
Differences To FSK
GFSK is actually an enhanced FSK, so both modulators are technically almost identical, except for one detail: the pulses pass a gaussian filter before they enter the FSK modulator.
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(content created Apr 17, 2024)