Cyclostationarity-Based Modulation Classification of Linear Digital Modulations in Flat Fading Channels

Authors:
Octavia A. Dobre;Ali Abdi;Yeheskel Bar-Ness;Wei Su
Affiliations:
Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John's, Canada A1B 3X5;Department of Electrical and Computer Engineering, New Jersey Institute of Technology, Newark, USA 07102;Department of Electrical and Computer Engineering, New Jersey Institute of Technology, Newark, USA 07102;RDECOM, Fort Monmouth, USA 07703
Venue:
Wireless Personal Communications: An International Journal
Year:
2010

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Abstract

Modulation classification is an intermediate step between signal detection and demodulation, and plays a key role in various civilian and military applications. In this correspondence, higher-order cyclic cumulants (CCs) are explored to discriminate linear digital modulations in flat fading channels. Single- and multi-antenna CC-based classifiers are investigated. These benefit from the robustness of the CC-based features to unknown phase and timing offset. Furthermore, the latter provides significant performance improvement due to spatial diversity used to combat the fading effect. Classifier performances are investigated under a variety of channel conditions. In addition, analytical closed-form expressions for the cyclic cumulant polyspectra of linearly digitally modulated signals affected by fading, carrier frequency and timing offsets, and additive Gaussian noise are derived, along with a condition for the oversampling factor to avoid aliasing in the cycle and spectral frequency domains.