Howtosignalprocessing
In digital communication, Gaussian minimum shift keying or GMSK is a continuous-phase frequency- shift keying modulation scheme. It is similar to standard minimum-shift keying (MSK); however the digital data stream is first shaped with a Gaussian filter before being applied to a frequency modulator.
Where is GMSK used?
A variant of MSK called Gaussian minimum-shift keying (GMSK) is used in the GSM mobile phone standard.
What does GMSK stand for?
GMSK – Gaussian minimum shift keying – is the original circuit switched GSM modulation system, allowing the GSM radio channel to be modulated at a data rate of 271kb/s whilst keeping the radio channel within a 200kHz bandwidth. This is the modulation system used for circuit switched and GPRS operations.
Why use GMSK in GSM?
GMSK is a special case of MSK modulation. The phase of the transmitted signal in GMSK scheme is continuous and smoothed by a Gaussian filter. This results in more compact spectrum than MSK and enables better utilization of the available frequency spectrum, at the expense of increased inter-symbol interference (ISI).
Why is GMSK used?
For HIPERLAN, Gaussian Minimum Shift Keying (GMSK) [Turletti96] are used as the high bit rate modulation scheme to modulate a high rate transmission. GMSK is a Constant Envelope modulation scheme, which means that the amplitude of the transmitted signal is constant. ...
