Title :
A QR Factorization Based Algorithm for Pilot Assisted Channel Estimation in OFDM Systems
Author :
Vigelis, R.F. ; Cavalcante, C.C.
Author_Institution :
Wireless Telecommun. Res. Group, Fed. Univ. of Ceara, Fortaleza, Brazil
Abstract :
This paper deals with the pilot assisted time-varying channel estimation in orthogonal frequency division multiplexing (OFDM) systems. Since the pilot sub-carrier correlations are rank deficient, an estimation scheme can be implemented by discarding the noise subspace components and filtering the subspace components. The subspace can be estimated by some subspace tracking (ST) algorithm. We propose to implement the subspace components filtering via a QR factorization based algorithm, which is suitable for operating in conjunction with the ST algorithm. The performance of the proposed schemes is verified by simulation in computer.
Keywords :
OFDM modulation; channel estimation; matrix algebra; time-varying channels; tracking; OFDM systems; QR factorization based algorithm; orthogonal frequency division multiplexing; pilot assisted channel estimation; pilot assisted time-varying channel estimation; pilot sub-carrier correlations; subspace tracking; Adaptive filters; Channel estimation; Computational modeling; Computer simulation; Filtering algorithms; Frequency estimation; OFDM; Signal to noise ratio; Time-varying channels; Wiener filter; Frequency division multiplexing; Matrix decomposition; Time-varying channels;
Conference_Titel :
Acoustics, Speech and Signal Processing, 2007. ICASSP 2007. IEEE International Conference on
Conference_Location :
Honolulu, HI
Print_ISBN :
1-4244-0727-3
DOI :
10.1109/ICASSP.2007.366533
