Title :
Semi-blind Channel Estimation for OFDM Systems
Author :
Yang, Weiwei ; Yueming Cai ; Xun, Youyun
Author_Institution :
Inst. of Commun. Eng., PLAUST
Abstract :
In this paper, we propose a semi-blind channel estimation method based on first-order statistics of OFDM systems. The transmitter superimposes periodic pilot sequences on information sequences, where there is no loss in information rate but a controllable increase in transmission power. Employing the first-order statistics, it enables a closed-form channel estimation method to estimate the frequency-selective fading channel. Then, a mean square error (MSE) bound is derived to evaluate the proposed channel estimator. Computer simulations have been provided to compare the MSE performances of the proposed method with the LS estimation method based PSAM and the subspace method
Keywords :
OFDM modulation; channel estimation; fading channels; least squares approximations; mean square error methods; statistics; LS estimation method; MSE bound; OFDM systems; first-order statistics; frequency-selective fading channel; information sequences; least square estimation; mean square error bound; orthogonal frequency division multiplexing; periodic pilot sequences; semi-blind channel estimation; subspace method; Channel estimation; Computer simulation; Frequency estimation; Frequency-selective fading channels; Information rates; Mean square error methods; OFDM; Propagation losses; Statistics; Transmitters; OFDM; first-order statistics; semi-blind channel estimation;
Conference_Titel :
Vehicular Technology Conference, 2006. VTC 2006-Spring. IEEE 63rd
Conference_Location :
Melbourne, Vic.
Print_ISBN :
0-7803-9391-0
Electronic_ISBN :
1550-2252
DOI :
10.1109/VETECS.2006.1682809
