Comparative Study of ICI Cancellation Methods in OFDM System

Abstract

Now-a-days, wireless communication is increasingly in demand
for high data rate applications. The orthogonal frequency division
multiplexing (OFDM) is one of the digitalize modulation utilized in a wide
area of communications framework. It is a successful modulation and
multiplexing technique that is utilized in various systems like IEEE
802.11a, IEEE802.16e (or WiMAX), hiperlan/2, DAB, DVB, DSL. OFDM
uses the multi sub-carriers within the single channel and these sub-carriers
are closely spaced orthogonal signals, transferred in parallel scheme.
OFDM is the way to slow down the symbol rate without slowing down the
data rate. However, there are some problems with OFDM like Carrier
Frequency Offset (CFO), Bit error rate (BER) & Inter Carrier Interference
(ICI). Due to the different carrier frequency offsets, orthogonality of subcarriers
is degraded and even the small change in carrier can lead to ICI.
This paper focuses on the technique of improving the performance of
OFDM for wireless communication by reducing the ICI caused by Carrier
Frequency Offset (CFO). This paper delivers the number of wireless
communication standards and numerous applications where OFDM systems
are referred and can be used in the future techniques.