Cyclostationarity-based recognition of orthogonal frequency division multiplexing and single carrier linear digital modulations


  1. Dobre, O.A.
Corporate Authors
Defence R&D Canada - Ottawa, Ottawa ONT (CAN);Memorial Univ of Newfoundland, St John's NFLD (CAN) Faculty of Engineering and Applied Science
In recent years, new technologies for wireless communications have emerged. The wireless industry has shown great interest in orthogonal frequency division multiplexing (OFDM) technology, due to the efficiency of OFDM schemes to convey information in a frequency selective fading channel without requiring complex equalizers. On the other hand, the emerging OFDM wireless communication technology raises new challenges for the designers of intelligent radios, such as discriminating between OFDM and single-carrier modulations. In this report we investigate signal cyclostationarity to discriminate between OFDM and single carrier linear digital (SCLD) modulations. We derive the analytical expressions for the nth-order (q-conjugate) cyclic cumulant (CC), cyclic cumulant polyspectra (CCP), and cycle frequencies of an OFDM signal embedded in additive white Gaussian noise, and subject to phase, frequency and timing offset. Furthermore, a necessary and sufficient is derived on the oversampling factor per subcarrier, to eliminate cycle aliasing. Based on a second-order CC, we propose an algorithm to discriminate between OFDM and SCLD signal classes. The proposed algorithm has the advantage of eliminating the need for signal preprocessing tasks, such as symbol timing, carrier and waveform recovery, and estimation of the signal and noise powers. Simulations are carried out to confirm the theoretical developments.

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Report Number
DRDC-OTTAWA-CR-2009-298 — Contractor Report
Date of publication
01 Apr 2010
Number of Pages
Electronic Document(PDF)

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