Mobile Phone Modulation
Location: Outside U.S.
Date: January 2009
What type of modulation do mobile phones
use? Is it Frequency Modulation, Amplitude
Modulation, or Pulse Modulation?
Unfortunately, your question cannot be answered so simply. Most mobile
phones these days are digital. Modulation is of a general type called FSK
(Frequency Shift Keying). Details depend on the type of phone network and
the country it is used in. For example, in Europe and much of the rest of
the world, the GSM standard is commonly used, whereas in the US the most
common standard is CDMA. CDMA phones use a type of "Spread Spectrum"
modulation. GMS phones use a modulation technique called GMSK (a type of
continuous-phase frequency shift keying).
A good overview is here....
...but as you will see, one thing is for sure: All mobile phone modulation
schemes are vastly more complex than the simple ones you have named.
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Update: June 2012