Wg. Jeon et al., An equalization technique for orthogonal frequency-division multiplexing systems in time-variant multipath channels, IEEE COMMUN, 47(1), 1999, pp. 27-32
A loss of subchannel orthogonality due to time-variant multipath channels i
n orthogonal frequency-division multiplexing (OFDM) systems leads to interc
hannel interference (ICI) which increases the error floor in proportion to
the Doppler frequency, In this paper, a simple frequency-domain equalizatio
n technique which can compensate for the effect of ICI in a multipath fadin
g channel is proposed. In this technique, the equalization of the received
OFDM signal is achieved by using the assumption that the channel impulse re
sponse (CIR) varies in a linear fashion during a block period and by compen
sating for the ICI terms that significantly affect the bit-error rate (BER)
performance.