Title :
Power delay profile and noise variance estimation for OFDM
Author :
Cui, Tao ; Tellambura, Chintha
Author_Institution :
Dept. of Electr. & Comput. Eng., Alberta Univ., Edmonton, Alta., Canada
fDate :
1/1/2006 12:00:00 AM
Abstract :
In this letter, we present cyclic-prefix (CP) based noise-variance and power-delay-profile estimators for Orthogonal Frequency Division Multiplexing (OFDM) systems. Signal correlation due to the use of the CP is exploited without requiring additional pilot symbols. A heuristic estimator and a class of approximate maximum likelihood (ML) estimators are proposed. The proposed algorithms can be applied to both unitary and non-unitary constellations. These algorithms can be readily used for applications such as minimum mean-square error (MMSE) channel estimation.
Keywords :
OFDM modulation; approximation theory; channel estimation; correlation methods; delay estimation; fading channels; maximum likelihood estimation; multipath channels; OFDM; approximation; channel estimation; cyclic-prefix based noise-variance; heuristic estimator; maximum likelihood estimator; orthogonal frequency division multiplexing system; power-delay-profile estimator; signal correlation; Additive white noise; Binary phase shift keying; Channel estimation; Delay estimation; Fading; Frequency estimation; Gaussian noise; Maximum likelihood estimation; OFDM modulation; Signal to noise ratio;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2006.1576558
