Title :
Joint carrier frequency synchronization and channel estimation for OFDM systems via the EM algorithm
Author :
Lee, Jong-Ho ; Han, Jae Choong ; Kim, Seong-Cheol
Author_Institution :
Sch. of Electr. Eng. & Comput. Sci., Seoul Nat. Univ., South Korea
Abstract :
A joint carrier frequency synchronization and channel estimation scheme is proposed for orthogonal frequency-division multiplexing (OFDM) system. In the proposed scheme, carrier frequency synchronization and channel estimation are performed iteratively via the expectation-maximization (EM) algorithm using an OFDM preamble symbol. Moreover, we analytically investigate the effect of frequency offset error on the mean square error (MSE) performance of channel estimator. Simulation results present that the proposed scheme achieves almost ideal performance for both channel and frequency offset estimation.
Keywords :
OFDM modulation; channel estimation; expectation-maximisation algorithm; mean square error methods; synchronisation; EM algorithm; OFDM systems; carrier frequency synchronization; channel estimation scheme; expectation-maximization algorithm; iterative methods; mean square error method; orthogonal frequency division multiplexing; Channel estimation; Fading; Frequency division multiplexing; Frequency estimation; Frequency synchronization; Iterative algorithms; Maximum likelihood estimation; Mean square error methods; OFDM; Performance analysis; Channel estimation; expectation–maximization (EM); frequency synchronization; orthogonal frequency-division multiplexing (OFDM);
Journal_Title :
Vehicular Technology, IEEE Transactions on
DOI :
10.1109/TVT.2005.861212
