Title :
Turbo channel estimation for OFDM systems on highly time and frequency selective channels
Author :
Affrot, Emmanuel J. ; Siala, Mohamed
Author_Institution :
France Telecom, France
Abstract :
We propose an optimum turbo channel estimation algorithm for OFDM systems on highly selective fading channels. This algorithm performs an iterative estimation of the multiplicative fading channel according to the maximum a posteriori criterion. It requires a convenient representation of the highly time and frequency selective fading channel based on the Karhunen-Loeve expansion theorem. It also optimally takes into account the coded structure of the data symbols in the estimation process thanks to the Bahl (1974) algorithm
Keywords :
OFDM modulation; diversity reception; fading channels; iterative methods; multipath channels; optimisation; parameter estimation; BER; Bahl algorithm; EM algorithm; Karhunen-Loeve expansion theorem; OFDM systems; channel representation; coded structure; data symbols; expectation-maximization algorithm; frequency selective channels; iterative estimation; iterative receiver; matched filter; maximum a posteriori criterion; multipath fading channel; multiplicative fading channel; optimum turbo channel estimation algorithm; spatial diversity; time selective channels; Channel estimation; Decorrelation; Fading; Frequency estimation; Iterative algorithms; OFDM; Phase shift keying; Scattering; System performance; Transfer functions;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 2000. ICASSP '00. Proceedings. 2000 IEEE International Conference on
Conference_Location :
Istanbul
Print_ISBN :
0-7803-6293-4
DOI :
10.1109/ICASSP.2000.861159
