2G systems use telephone like circuit switching for voice communication
in an efficient way but were unable to transmit data with higher data rates due
to its spectral inefficiency. An evolution of 3G system is due to the fact of
desire to have higher data rates which is observed in the characteristics of
International Mobile Telecommunication 2000(IMT 2000) standard...............
continue with the discussion focusing on coding technology used in 3G, modulation scheme used in 3G, HSDPA, WIMAX, 3GPP LTE, 4G coding technology and MIMO-OFDM