OFDM/OQAM modulation for efficient dynamic spectrum access

Authors:
A. Skrzypczak;J. Palicot;P. Siohan
Affiliations:
ECAM Rennes Louis de Broglie, Campus de Ker Lann Bruz, CS 29128, 35091 Rennes Cedex, France.;IETR/Supélec, Avenue de la Boulaie, CS 47601, 35576 Cesson-Sévigné Cedex, France.;Orange Labs, 4 rue du Clos Courtel, BP 91226, 35512 Cesson-Sévigné Cedex, France
Venue:
International Journal of Communication Networks and Distributed Systems
Year:
2012

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Abstract

The cognitive radio idea consists in the exploitation of spectral resources that are unused by a licensed user within a telecommunication standard. After having detected these available frequency bands by some sensing technique, our work takes a stand on the spectrum access problem. This issue requires some constraints on the modulation that must be taken into account. The flexibility in frequency offered by a multicarrier modulation (MCM) then represents a strong advantage which, in addition, can be fully exploited by the OFDM/OQAM modulation. Indeed, the fact that well localised frequency pulse shapes can be employed makes this modulation attractive for an optimised dynamic spectrum insertion. OFDM/OQAM and OFDM-based solutions are finally tested considering two different transmission scenarios. In both scenarios, it is shown that, for OFDM/OQAM, the time-frequency localisation criterion leads to a short prototype filter, satisfying a good compromise in terms of complexity/performance and also leads at the same time to a better peak-to-average power ratio (PAPR) distribution when compared to an analogue windowed OFDM scheme.