Title :
A subspace-based method for blind CFO estimation in OFDM systems
Author :
Pan, Yen-Chang ; Phoong, See-May
Author_Institution :
Dept. of EE, Nat. Taiwan Univ., Taipei, Taiwan
Abstract :
Recently, a blind subspace channel estimation algorithm in which using only a few received OFDM blocks is proposed. Based on this earlier work, we introduce a novel subspace-based blind carrier frequency offset (CFO) estimation method for OFDM systems. The CFO is obtained by solving the nullspace of the proposed rank-reduced matrix and the CFO estimate is given in closed form. Moreover, we do not make the assumption that the modulation symbols are white or constant-modulus. Simulation results show that the proposed method performs better than the existing methods.
Keywords :
OFDM modulation; channel estimation; matrix algebra; blind subspace channel estimation algorithm; modulation symbols; orthogonal frequency division multiplexing systems; rank-reduced matrix; received OFDM blocks; subspace-based blind CFO estimation; subspace-based blind carrier frequency offset estimation; Eigenvalues and eigenfunctions; Estimation; Mean square error methods; Modulation; OFDM; Signal to noise ratio; Vectors; Carrier frequency offset (CFO); blind method; orthogonal frequency division multiplexing (OFDM);
Conference_Titel :
Acoustics, Speech and Signal Processing (ICASSP), 2012 IEEE International Conference on
Conference_Location :
Kyoto
Print_ISBN :
978-1-4673-0045-2
Electronic_ISBN :
1520-6149
DOI :
10.1109/ICASSP.2012.6288550
