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

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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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Abbreviations

ASK:

Amplitude shift keying

AWGN:

Additive white Gaussian noise

BPSK:

Binary phase shift keying

CC:

Cyclic cumulant

CF:

Cycle frequency

CCP:

Cyclic cumulant polyspectrum

FB:

Feature based

FIR:

Finite impulse response

LB:

Likelihood based

MC:

Modulation classification

OFDM:

Orthogonal frequency division multiplexing

PSK:

Phase shift keying

QAM:

Quadrature amplitude modulation

QPSK:

Quadrature PSK

SNR:

Signal-to-noise ratio

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Authors and Affiliations

  1. Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John’s, NL, A1B 3X5, Canada

    Octavia A. Dobre

  2. Department of Electrical and Computer Engineering, New Jersey Institute of Technology, Newark, NJ, 07102, USA

    Ali Abdi & Yeheskel Bar-Ness

  3. RDECOM, Fort Monmouth, NJ, 07703, USA

    Wei Su

Authors
  1. Octavia A. Dobre
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  2. Ali Abdi
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  3. Yeheskel Bar-Ness
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  4. Wei Su
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Correspondence to Octavia A. Dobre.

Additional information

Part of this work was published in a preliminary form and presented at the IEEE Military Communication Conference (MILCOM) 2003 and 2005, USA, under the titles “Higher-order cyclic cumulants for high order modulation classification,” and “Selection combining for modulation recognition in fading channels,” respectively.

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Dobre, O.A., Abdi, A., Bar-Ness, Y. et al. Cyclostationarity-Based Modulation Classification of Linear Digital Modulations in Flat Fading Channels. Wireless Pers Commun 54, 699–717 (2010). https://doi.org/10.1007/s11277-009-9776-2

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  • DOI: https://doi.org/10.1007/s11277-009-9776-2

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