DMCA
Vandermonde-subspace Frequency Division Multiplexing for Two-Tiered Cognitive Radio Networks
| Citations: | 10 - 7 self |
BibTeX
@MISC{Cardoso_vandermonde-subspacefrequency,
author = {Leonardo S. Cardoso and Mari Kobayashi and Francisco Rodrigo and P. Cavalcanti},
title = {Vandermonde-subspace Frequency Division Multiplexing for Two-Tiered Cognitive Radio Networks},
year = {}
}
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Abstract
plexing (VFDM) is an overlay spectrum sharing technique for cognitive radio. VFDM makes use of a precoder based on a Vandermonde structure to transmit information over a secondary system, while keeping an orthogonal frequency division multi-plexing (OFDM)-based primary system interference-free. To do so, VFDM exploits frequency selectivity and the use of cyclic prefixes by the primary system. Herein, a global view of VFDM is presented, including also practical aspects such as linear receivers and the impact of channel estimation. We show that VFDM provides a spectral efficiency increase of up to 1 bps/Hz over cognitive radio systems based on unused band detection. We also present some key design parameters for its future implementation and a feasible channel estimation protocol. Finally we show that, even when some of the theoretical assumptions are relaxed, VFDM provides non-negligible rates while protecting the primary system. Index Terms—Vandermonde, precoder, interference, dynamic spectrum access, cognitive interference channel
Keyphrases
primary system two-tiered cognitive radio network vandermonde-subspace frequency division multiplexing practical aspect global view theoretical assumption dynamic spectrum access future implementation bps hz cyclic prefix key design parameter vandermonde structure orthogonal frequency division multi-plexing non-negligible rate index term vandermonde frequency selectivity spectral efficiency increase linear receiver secondary system cognitive radio feasible channel estimation protocol cognitive radio system cognitive interference channel unused band detection channel estimation overlay spectrum
