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Multi-colour light-emitting diode (LED) based visible light communication(VLC) benefits from wavelength diversity while providing indoor illumination.Colour shift keying (CSK) is a well-researched IEEE standardised multi-colourVLC modulation technique. This paper presents an investigation into theperformance of tri-chromatic LED (TLED) CSK standardised in IEEE 802.15.7 and aquad-chromatic LED (QLED) CSK, over a range of diffuse optical wirelesschannels, and proposes the use of frequency domain equalisation (FDE) at thereceiver to combat multipath dispersion. The investigation results show thatthe FDE enables the higher order CSK modulation modes to achieve a bit errorrate (BER) of 10\textsuperscript{-6} for finite amounts of optical power whileoperating over highly dispersive channels and hence provide data links of up to85.33 and 256 Mbit/s through TLED and QLED CSK, respectively, for a systembandwidth of 24 MHz. The overall optical power requirements of the CSK schemescan be reduce by up to 12.6 dB with the use of FDE at the cost of a smalloverhead due to cyclic prefix. The optical channel model used in thisinvestigation includes the cross-talk and insertion losses caused by theoptical properties of commercially available system front end devices.

Performance Evaluation of Frequency Domain Equalisation Based Colour Shift Keying Modulation Schemes Over Diffuse Optical Wireless Channels