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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.
We study the use of co-ordinate interleaving technique for reducing the effect of frequency offset in OFDM communication systems. The inter-carrier interference effect (ICI) due to frequency offset is reduced by increasing the carrier power using CI techniques. The performance of OFDM with co-ordinate interleaving is compared with the conventional coding technique for combating the frequency offset...
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