High mobility Channel Estimation and Equalization For OFDM system

The orthogonal frequency division multiplexing (OFDM) is generally used in nowdays high data rate transmission. But, OFDM suffers from interchannel interference (ICI) in rapid variations of doubly selective fading channels even though it is strong at narrow band noise and intersymbol interference (ISI). So, the ICI cancellation should be done at receiver effectively. However, channel estimation and equalization processes in receiver, which mainly works for ICI cancellation, give great complexity for calculating main parameters like inverse of autocovariance of estimated channel. Such calculation is unavoidable to get equalizer tap solutions. In this paper, we introduce low complexity techniques for equalization based on coherent bandwidth and signal power distribution. Those realize lower complexity equalization keeping desirable performances. At last, simulation part will help you to understand.