Title :
TCOFDM symbols detection : joint channel estimation and decoding
Author :
Ammari, Mohamed L. ; Gagnon, François
Author_Institution :
Dept. of Electr. Eng., Ecole de Technol. Superieure, Montreal, Que., Canada
Abstract :
In this paper, we consider the detection of turbo coded symbols in orthogonal frequency division multiplexed (OFDM) systems and propose a turbo detector composed of a turbo decoder and a channel estimator. These modules perform jointly and exchange a soft information through an iterative process. The decoder consists of the maximum a posteriori MAP-BCJR algorithm and the channel estimator is based on the minimum mean square error (MMSE) criterion. The proposed approach allows for the use of all available information, increases the quality of channel estimation and improves the system performance. Simulation results for rate 1/3 turbo code show the efficiency of the proposed detector.
Keywords :
OFDM modulation; channel estimation; iterative decoding; least mean squares methods; maximum likelihood estimation; multipath channels; turbo codes; MMSE; TCOFDM symbols detection; channel estimation; maximum a posteriori algorithm; minimum mean square error criterion; multipath channel; orthogonal frequency division multiplexed systems; turbo coded symbols; turbo decoder; turbo detector; Channel estimation; Detectors; Frequency division multiplexing; Frequency estimation; Iterative algorithms; Iterative decoding; Mean square error methods; OFDM; System performance; Turbo codes;
Conference_Titel :
Communications, 2004 IEEE International Conference on
Print_ISBN :
0-7803-8533-0
DOI :
10.1109/ICC.2004.1312622
