Title :
Sparse channel estimation in OFDM systems by threshold-based pruning
Author :
Oliver, J. ; Aravind, R. ; Prabhu, K.M.M.
Author_Institution :
Dept. of Electr. Eng., Indian Inst. of Technol. Madras, Chennai
Abstract :
A threshold-based procedure to estimate sparse channels in an orthogonal frequency division multiplexing (OFDM) system is proposed. An optimal threshold is derived by maximising the probability of correct detection between significant and zero-valued taps estimated by the least squares (LS) estimator. Improved LS estimates are obtained by pruning the LS estimates with the statistically derived threshold.
Keywords :
OFDM modulation; channel estimation; estimation theory; least squares approximations; probability; OFDM system; correct detection probability; least square estimator; orthogonal frequency division multiplexing; sparse channel estimation; threshold-based pruning; zero-valued tap estimation;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20081089
