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1G ,2G , 3G and 4G

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1G WIRELESS TECHNOLOGY


.Using Analog signals
.Listen to handset
. Frequency typically 150MHz & above


DRAWBACKS OF 1G


.Poor voice quality
.Poor battery life
. Large phone size
.No security
.Frequent call drops
. Limited capacity and poor handoff
reliability.


SECOND GENERATION



2G phones using global system for mobile communications (GSM) were first used in the early 1990 s in Europe. GSM provides voice and limited data services and uses digital modulation for improved audio quality. Digital AMPS , CDMA were some of the 2G systems.

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