On the cyclostationarity of OFDM and single carrier linearly digitally modulated signals in time dispersive channels: theoretical developments and application

Authors:
A. Punchihewa;Q. Zhang;O. A. Dobre;C. Spooner;S. Rajan;R. Inkol
Affiliations:
Department of Electrical and Computer Engineering, University of British Columbia, Vancouver, BC, Canada;Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John's, NL, Canada;Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John's, NL, Canada;NorthWest Research Associates, CA;Defence Research and Development Canada, Ottawa, ON, Canada;Defence Research and Development Canada, Ottawa, ON, Canada
Venue:
IEEE Transactions on Wireless Communications
Year:
2010

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Abstract

Previous studies on the cyclostationarity aspect of orthogonal frequency division multiplexing (OFDM) and single carrier linearly digitally modulated (SCLD) signals assumed simplified signal and channel models or considered only secondorder cyclostationarity. This paper presents new results concerning the cyclostationarity of these signals under more general conditions, including time dispersive channels, additive Gaussian noise, and carrier phase, frequency, and timing offsets. Analytical closed-form expressions are derived for time- and frequencydomain parameters of the cyclostationarity of OFDM and SCLD signals. In addition, a condition to eliminate aliasing in the cycle and spectral frequency domains is derived. Based on these results, an algorithm is developed for recognizing OFDM versus SCLD signals. This algorithm obviates the need for commonly required signal preprocessing tasks, such as signal and noise power estimation and the recovery of symbol timing and carrier information.