Title :
Time-domain adaptive channel estimation for OFDM-based WLAN with multiple-antennas
Author :
Saeed, M.A. ; Ali, B.M. ; Noordin, N.K. ; Khatun, S. ; Ismail, M.
Author_Institution :
Wireless Broadband, MIMOS Berhad, Kuala Lumpur
Abstract :
In this paper, an adaptive time-domain (TD) channel estimation scheme, based on recursive least squares (RLS) algorithm, is proposed for multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) based wireless local area networks (WLANs). The estimator is then extended to perform decision-directed (DD) channel tracking during data transmission. The channel is assumed to be constant during one OFDM symbol but evolves in time according to the first-order Markov process. Different training rates at different Doppler frequencies were investigated. Simulation results show that the proposed estimation scheme has excellent performance measured in terms of the mean squares error (MSE) and the bit error rate (BER), provided that the forgetting factor of the RLS algorithm is optimally selected.
Keywords :
Doppler effect; MIMO communication; Markov processes; OFDM modulation; broadband antennas; channel estimation; error statistics; least mean squares methods; wireless LAN; Doppler frequency; Markov process; bit error rate; data transmission; decision-directed channel tracking; mean squares error; multiple-antennas; multiple-input multiple-output system; orthogonal frequency division multiplexing; recursive least squares; time-domain adaptive channel estimation; wireless local area network; Bit error rate; Channel estimation; Data communication; Least squares approximation; MIMO; Markov processes; OFDM; Resonance light scattering; Time domain analysis; Wireless LAN;
Conference_Titel :
Computer and Communication Engineering, 2008. ICCCE 2008. International Conference on
Conference_Location :
Kuala Lumpur
Print_ISBN :
978-1-4244-1691-2
Electronic_ISBN :
978-1-4244-1692-9
DOI :
10.1109/ICCCE.2008.4580608
