Title :
Simple equalization of time-varying channels for OFDM
Author :
Rugini, Luca ; Banelli, Paolo ; Leus, Geert
Author_Institution :
D.I.E.I., Perugia Univ., Italy
fDate :
7/1/2005 12:00:00 AM
Abstract :
We present a block minimum mean-squared error (MMSE) equalizer for orthogonal frequency-division multiplexing (OFDM) systems over time-varying multipath channels. The equalization algorithm exploits the band structure of the frequency-domain channel matrix by means of a band LDLH factorization. The complexity of the proposed algorithm is linear in the number of subcarriers and turns out to be smaller with respect to a serial MMSE equalizer characterized by a similar performance.
Keywords :
OFDM modulation; channel estimation; equalisers; interference suppression; least mean squares methods; matrix decomposition; multipath channels; radiofrequency interference; time-varying channels; MMSE; OFDM; block minimum mean-squared error equalizer; equalization algorithm; frequency-domain channel matrix; intercarrier interference; orthogonal frequency-division multiplexing system; time-varying multipath channel; Equalizers; Frequency division multiplexing; Frequency domain analysis; Mobile communication; Multipath channels; OFDM; TV interference; Time varying systems; Time-varying channels; Wireless communication;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2005.1461683
