INFRASTRUCTURE
Some possible standards for the 4G system are LTE, 802.20, WiMAX (802.16), HSDPA, TDD UMTS, UMTS and future versions of UMTS.
The design is that 4G is based on OFDM (Orthogonal Frequency Division Multiplexing) which is the key enabler of 4G technology. Other technological aspects of 4G are adaptive processing and smart antennas, both of which are used in 3G networks and will enhance the rates when used in with OFDM.
The design is that 4G is based on OFDM (Orthogonal Frequency Division Multiplexing) which is the key enabler of 4G technology. Other technological aspects of 4G are adaptive processing and smart antennas, both of which are used in 3G networks and will enhance the rates when used in with OFDM.
Working of 4G communication system (Using OFDM):-
“Orthogonal FDM's spread spectrum technique” spreads the data over a lot of carriers that are spaced apart at precise frequencies. This spacing provides the "orthogonality" in this method which prevents the receivers/demodulators from seeing frequencies other than their own specific one. The main benefit of OFDM is high spectral efficiency and high resiliency to RF interference and the multi-path distortion is lower. This is handy because in a standard terrestrial broadcasting situation there are many multipath-channels.
Block diagram of the OFDM transceiver
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