Gaussian minimum shift keying

Gaussian Minimum Shift Keying, GMSK is a form of modulation based on frequency shift keying that has no phase discontinuities and provides efficient use of spectrum as well as enabling high efficiency radio power amplifiers.

1. What is Gaussian shift keying?
2. What is minimum phase shift keying?
3. What is meant by GMSK?
4. What is the difference between GMSK and GFSK?

What is Gaussian shift keying?

Gaussian frequency-shift keying (GFSK) is a type of FSK modulation which uses a Gaussian filter to shape the pulses before they are modulated. This reduces the spectral bandwidth and out-of-band spectrum, to meet adjacent-channel power rejection requirements.

What is minimum phase shift keying?

Minimum shift keying (MSK), which is a special form of continuous-phase frequency-shift keying, with the detection in the receiver being performed in two successive bit intervals.

What is meant by GMSK?

Gaussian minimum shift keying (GMSK) is a form of frequency shift keying (FSK) used in GSM systems. The tone frequencies are separated by exactly half the bit rate. It has high spectral efficiency.

What is the difference between GMSK and GFSK?

With GMSK, the frequency modulation index is 0.5. With GFSK, the frequency modulation index is larger than 0.5 (the signaling tones are farther apart). The receiving techniques used for GMSK as an FSK work for GFSK.