Time series: theory and methods
Time series: theory and methods
Cyclostationarity: half a century of research
Signal Processing
Cyclostationary Signatures in Practical Cognitive Radio Applications
IEEE Journal on Selected Areas in Communications
Multi-window spectrum sensing of unsynchronized OFDM signal at very low SNR
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Fundamental Limitations on Pilot-based Spectrum Sensing at Very Low SNR
Wireless Personal Communications: An International Journal
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In the context of cognitive radio, this paper addresses the challenge of OFDM system identification. We show that it is possible to take advantage of pilot tone structures to perform identification. Pilot subcarrier usage is of great interest since it enables to discriminate OFDM systems that have the same modulation parameters (subcarrier spacing, cyclic prefix duration, etc.). The proposed method relies on the periodic redundancy often induced between pilot symbols. We demonstrate that most OFDM systems (Wifi, WiMAX, DVB-T, etc.) can be identified thanks to this redundancy by conducting a hypothesis test based on second order statistics. Detailed numerical examples demonstrate the efficiency of the proposed identification criterion in various kinds of environments.