Cyclostationarity-Based Modulation Classification of Linear Digital Modulations in Flat Fading Channels |
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Authors: | Octavia A Dobre Ali Abdi Yeheskel Bar-Ness Wei Su |
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Institution: | (1) Center for Information Technology of Yonsei, Yonsei University, Seoul, 120-749, Korea |
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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. |
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Keywords: | |
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