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LED clipping distortion compensation in optical wireless communication via multiple transmit LEDs

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Abstract

A method to reduce signal clipping distortion in indoor optical wireless communication systems based on orthogonal frequency division multiplexing (OFDM) modulation is presented in this paper. Compensating the resulting clipping distortion due to LED operational constrains is achieved through the use of iterative signal clipping (ISC) and multiple light emitting diodes (LED) at the transmitter. ISC technique is based on iterative clipping of the time domain OFDM signal and transmission from a multiple LED transmitter. Transmit LEDs are synchronized, located close to each other, and placed to emit light in the same direction. Hence, the channel path gains from each LED to the receiver photo diode are similar. The received signals from the different LEDs add coherently at the receiver. Reported results demonstrate that the effect of distortion due to clipping is eliminated or significantly reduced based on the considered number of LEDs.

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Notes

  1. In this paper and for the sake of brevity, only DCO–OFDM system will be considered since it suffers significantly from lower and upper clipping. The extension of the proposed analysis and results to ACO–OFDM is straightforward.

  2. Please note that such predistorter is applicable at low frequency where static LED nonlinearity can be assumed.

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  1. University of Tabuk, Tabuk, Saudi Arabia

    Raed Mesleh

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  1. Raed Mesleh
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Correspondence to Raed Mesleh.

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Mesleh, R. LED clipping distortion compensation in optical wireless communication via multiple transmit LEDs. Photon Netw Commun 26, 25–31 (2013). https://doi.org/10.1007/s11107-013-0406-2

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  • DOI: https://doi.org/10.1007/s11107-013-0406-2

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