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D. Eiwen, G. Tauböck, F. Hlawatsch, H.G. Feichtinger:
"Group sparsity methods for compressive channel estimation in doubly dispersive multicarrier systems";
Poster: IEEE Workshop on Signal Processing Advances in Wireless Communications (SPAWC), Marrakech, Marokko; 20.06.2010 - 23.06.2010; in: "Proc. IEEE SPAWC-10", (2010), 5 S.

We propose advanced compressive estimators of doubly dispersive
channels withinmulticarrier communication systems (including classical OFDM systems). The performance of compressive channel estimation has been shown to be limited by leakage components impairing the channel's effective delay-Doppler sparsity. We demonstrate a group sparse structure of these leakage components and apply recently proposed recovery techniques for group sparse signals.
We also present a basis optimization method for enhancing group
sparsity. Statistical knowledge about the channel can be incorporated
in the basis optimization if available. The proposed estimators
outperform existing compressive estimators with respect to estimation
accuracy and, in one instance, also computational complexity.

OFDM, multicarrier modulation, channel estimation, doubly dispersive channel, doubly selective channel, compressed sensing, group sparsity, block sparsity, union of subspaces

http://publik.tuwien.ac.at/files/PubDat_187390.pdf