Pilot-assisted PAPR reduction technique for O-OFDM using multiple LEDs in VLC systems

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    Spatial summation in optical orthogonal frequency division multiplexing (O-OFDM) provides opportunity of simultaneously transmitting narrowband visible light communications (VLC) signals using G light emitting diode (LED) groups. However, the number of transmit chains increases as the number of LED groups G increases. The limited dynamic range of these LEDs reinforces the need to reduce peak-to-average-power-ratio (PAPR) of O-OFDM signal in the VLC system. In this paper, we present study of the pilot-assisted (PA) PAPR reduction technique in O-OFDM using multiple LEDs. The PA technique is based on data symbol phase rotation with P iterations of pilot symbol to achieve PAPR reduction. Results show tradeoff between multiple LEDs hardware complexity and the PA technique to achieve desirable PAPR reduction. In comparison with basic O-OFDM with G = 12, simulation results show that PA technique is capable of reducing G by about half to achieve same PAPR of approximately 12 dB using P = 2 at a complementary cumulative distribution function (CCDF) of 10-3. Using the PA technique, further PAPR reduction can be achieved with the combination of increased P and G.
    Original languageEnglish
    Title of host publication2016 IEEE International Conference on Communications Workshops (ICC)
    Number of pages6
    ISBN (Electronic)9781509004485
    ISBN (Print)9781509004485
    Publication statusPublished - 7 Jul 2016


    • Multiple LEDs
    • O-OFDM
    • PAPR reduction
    • Spatial summation
    • VLC

    ASJC Scopus subject areas

    • Computer Networks and Communications


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