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Iterative signal reconstruction of deliberately clipped SMT signals

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Abstract

Staggered MultiTone (SMT) is a modulation technique showing significantly reduced Adjacent Channel Leakage Ratio (ACLR) resulting in a more compact Power Spectrum Density (PSD) for the transmitted signal, than the well-known and already widely adopted Orthogonal Frequency Division Multiple Access (OFDMA) scheme. However, the unique spectral properties of an SMT signal could be degraded by a non-linear element (e.g. a Power Amplifier (PA)) in the transmitter. Deliberate baseband clipping can be applied to the transmitted signal, reducing the notable high Peak-to-Average Power Ratio (PAPR). The objective of this paper is to give a brief introduction to the SMT scheme, with a special emphasis on deliberate clipping effects and their compensation. The paper introduces two receiver-oriented iterative methods aiming at the restoration of the baseband Bit Error Rate (BER) performance of a non-clipped signal. The methods are evaluated and compared based on numerical simulations. The paper concludes with the selection of a possible candidate for use in systems applying deliberately clipped SMT signals.

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Authors and Affiliations

  1. Budapest University of Technology and Economics, Budapest, Hungary

    Zsolt Kollár, Péter Horváth & Lajos Varga

  2. Technical University of Košice, Kosice, Slovakia

    Juraj Gazda & Dušan Kocur

Authors
  1. Zsolt Kollár
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  2. Juraj Gazda
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  3. Péter Horváth
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  4. Lajos Varga
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  5. Dušan Kocur
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Corresponding author

Correspondence to Zsolt Kollár.

Additional information

Digital Terrestrial Television Action Group. Understanding DVB-T2. http://www.digitag.org/DTTResources/DVBT2Handbook.pdf, 2009.

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Kollár, Z., Gazda, J., Horváth, P. et al. Iterative signal reconstruction of deliberately clipped SMT signals. Sci. China Inf. Sci. 57, 1–13 (2014). https://doi.org/10.1007/s11432-013-4921-7

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  • DOI: https://doi.org/10.1007/s11432-013-4921-7

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