LDPC Coded Visible Light Communication

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Visible light communication (VLC) using the visible light band in the electromagnetic spectrum (EM) promises an opportunity to reach a significantly large and unregulated part of the EM spectrum. Therefore, this modality of communication has become a promising alternative to radio frequency (RF) communication, which is falling short in responding to the future demands for spectrum. Recent studies have shown that the direct detection optical orthogonal frequency-division multiplexing (DDO-OFDM) can increase throughput of VLC system with proper doublesided clipping. Low density parity check codes (LDPC) are shown to be capacity achieving error correcting codes. In this thesis, LDPC codes are implemented to mitigate the clipping noise in VLC systems in order to promote spectrum efficiency. The impact of clipping range is studied, and optimum range is suggested. In addition, puncturing is applied for different coding rates to maximize the capacity of the channel by reducing the effect of clipping. Finally, the performance enhancement of the LDPC coded visible light scheme is compared with that of the Reed Solomon coded VLC systems.

Optical communications, Orthogonal frequency division multiplexing, Error-correcting codes (Information theory), Frequency spectra
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