AUTHORS: M. I. Youssef, H. A. Konber, U. A. Gad, Amira A. Mohammed
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ABSTRACT: Light emitting diodes (LEDs) can be used by the system called visible light communication (VLC) to support communication and illumination at the same time. The main problem high peak-to-average power ratios (PAPRs) is increased in orthogonal frequency division multiplexing (OFDM) signal sent in the system of a VLC but OFDM is used to minimizing the inter-symbol interference (ISI).A hybrid PAPR reduction technique has been proposed depend on the transformation of signal combined with clipping. The minimum threshold of clipping is additionally decided at the same time to decrease the PAPR and enhance the BER of the systems of VLC. Another OFDM structure utilizes the precoding of discrete cosine transform (DCT) before inverse fast Fourier transforms (IFFT) block to additionally enhance the capability of reduction of PAPR and the performance of BER. Some of simulation examples are achieved to trial the proposed technique performance as far as the BER and the complementary cumulative distribution function (CCDF). The got results demonstrate that the proposed system can decrease the PAPR at the same time and accomplish perfect performance of BER compared with the VLC-OFDM system.
KEYWORDS: OFDM, VLC systems, PAPR reduction, QAM, DCT, Hermitian symmetry
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