Title :
Time-domain method for tracking dispersive channels in OFDM systems
Author :
Roman, Timo ; Enescu, Mihai ; Koivunen, Visa
Author_Institution :
Lab. of Signal Process., Helsinki Univ. of Technol., Espoo, Finland
Abstract :
In this paper we address the problem of channel estimation in the case of single-input single-output (SISO) OFDM systems. The proposed technique is based on time-domain channel estimation whereas equalization is performed in frequency domain. The time-domain channel estimation/tracking stage is based on the Kalman filter. Due to the nature of OFDM transmission, equalization in frequency domain is done using single-tap zero-forcing of MMSE techniques. Improvements over existing methods are demonstrated in simulations using time and frequency selective channels.
Keywords :
Kalman filters; OFDM modulation; channel estimation; dispersive channels; equalisers; least mean squares methods; mobile radio; time-domain analysis; tracking filters; Kalman filter; MMSE technique; channel estimation; frequency selective channel; single input single output OFDM system; single tap zero forcing; time selective channel; time-domain channel estimation; tracking dispersive channel; Channel estimation; Discrete Fourier transforms; Dispersion; Frequency domain analysis; Frequency estimation; Intersymbol interference; OFDM modulation; Robustness; Signal processing; Time domain analysis;
Conference_Titel :
Vehicular Technology Conference, 2003. VTC 2003-Spring. The 57th IEEE Semiannual
Print_ISBN :
0-7803-7757-5
DOI :
10.1109/VETECS.2003.1207841
