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SEE-OFDM: Spectral and energy efficient OFDM for optical IM/DD systems

Authors: Hany Elgala; Thomas D. C. Little;

SEE-OFDM: Spectral and energy efficient OFDM for optical IM/DD systems

Abstract

In the next major phase of mobile telecommunications standards “5G,” Visible Light Communication (VLC) technology or light fidelity (Li-Fi) has great potential to be a breakthrough technology in the future of wireless Internet access. We propose a novel real-valued unipolar version of orthogonal frequency division multiplexing (OFDM) that is suitable for direct intensity modulation with direct detection (IM/DD) optical wireless systems including VLC. Without additional forms of interference estimation and cancelation to recover the symbols, the Spectral and Energy Efficient OFDM (SEE-OFDM) almost doubles the spectral efficiency of unipolar optical OFDM formats. In our scheme, multiple signals are generated and added/transmitted together, where both odd and even indexed subcarriers of the inverse fast Fourier transform (IFFT) operation carry data and are not affected by any kind of interference, (e.g., clipping). Monte Carlo simulations under additive white Gaussian noise (AWGN) show gains of up to 6dB in signal-to-noise ratio (SNR) compared to the conventional energy-efficient asymmetrically clipped optical OFDM (ACO-OFDM). Moreover, a peak-to-average power ratio (PAPR) reduction of 2.5dB is obtained as a bonus. Therefore, advantages such as increased data rate and reduced PAPR make the proposed SEE-OFDM very attractive for optical wireless systems.

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Subjects by Vocabulary

Microsoft Academic Graph classification: Computer science business.industry Orthogonal frequency-division multiplexing Visible light communication Spectral efficiency Interference (wave propagation) law.invention symbols.namesake Additive white Gaussian noise Signal-to-noise ratio law Electronic engineering symbols Optical wireless Telecommunications business Intensity modulation 5G Light-emitting diode

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    citations
    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    60
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Top 10%
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Top 10%
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Top 10%
  • citations
    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    60
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Top 10%
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Top 10%
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Top 10%
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
60
Top 10%
Top 10%
Top 10%