Generations of mobile
communication system
learn the history of mobile communication
(a)
First Generation
(IG) System: These are voice oriented analog cellular and cordless
telephones. These systems use two separate frequency bands for forward (from
base station to mobile) and reverse (from mobile to base station) links. Such a
system is referred to as frequency division duplex (FDD) scheme. The typical
allocated overall band in each direction was25 KHz. The dominant spectra of
operation for these systems were the 800 and 900 MHz bands. All the first
generation (IG) system use analog frequency modulation
for which the transmission power requirement depends on the transmission
bandwidth.
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