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The modulation scheme used in GSM is 

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  1. frequency shift keying 
  2. phase shift keying 
  3. Gaussian minimum shift keying 
  4. amplitude shift keying 

Answer (Detailed Solution Below)

Option 3 : Gaussian minimum shift keying 
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  • 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.
  • GMSK is probably most widely associated with the 2G GSM mobile communications system where it proved to be an effective form of modulation.
  • It was one of the reasons that GSM cellphones had a long battery life in view of the high efficiency that could be obtained from the RF power amplifiers.
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