Lina Mroueh
"Tout point de vue de valeur doit être partial pour communiquer vraiment quelque chose!"
Vaclav Havel, Extrait de L'Anatomie du gag
Reduced feedback for selective fading MIMO broadcast channels
| Authors |
| L. Mroueh, S. Rouquette-Léveil and J-C. Belfiore |
| Reference |
| EURASIP Journal on Wireless Communications and Networking 2011 ,special issue in recent advances on multiuser MIMO systems. |
| Abstract |
| In this article, we analyze the selective multiple-input multiple-output broadcast channel, where links are assumed to be selective in both time and frequency. The assumption of full channel knowledge at the transmitter side requires a large amount of feedback, and it is therefore not practical to be implemented in real systems. A more feasible solution with finite rate feedback originally proposed by Jindal in IEEE Trans. Inf. Theory is applied here to the selective fading case, where the minimal number of feedback bits required to achieve the full multiplexing is derived. We show that the correlation between time frequency channels can be used in order to minimize the number of feedback bits to the transmitter side while conserving the maximal multiplexing gain. Finally, the practical implementation of a time-frequency channel quantization scheme is addressed, and a low-complexity scheme that also achieves the multiplexing gain is proposed. |
| Keywords |
| time-frequency selective channel, underspread channel, broadcast channel, random vector quantization, Grassmann manifold, multiplexing gain. |
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