Abstract
In visible light communication (VLC), color-shift keying (CSK) is an intensity modulation scheme that transmits data through the variation of color with fixed optical intensity. The mutual information of a CSK modulation scheme is investigated in this letter. An expression for the mutual information of the VLC system is first derived. However, the expression is not in a closed form and its value can only be obtained by numerical simulations. To overcome this issue, an approximation for the mutual information is then obtained on the basis of Jensen’s inequality. The approximation is in a closed form, which brings convenience for analyzing the system performance and optimizing the mutual information. Numerical results show that the approximation is accurate in both low and high signal-to-noise ratio (SNR) regimes, and approaches the real value well for in-between SNR values.
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