**Fundamental Analysis for Visible Light Communication with Input‐Dependent Noise**

Jin‐Yuan Wang, Jun‐Bo Wang and Yongjin Wang

Additional information is available at the end of the chapter

http://dx.doi.org/10.5772/68019

#### Abstract

Recently, visible light communication (VLC) has drawn much attention. In literature, the noise in VLC is often assumed to be independent of the input signal. This assumption neglects a fundamental issue of VLC: due to the random nature of photon emission in the lighting source, the strength of the noise depends on the signal itself. Therefore, the input-dependent noise in VLC should be considered. Given this, the fundamental analysis for the VLC with input-dependent noise is presented in this chapter. Based on the information theory, the theoretical expression of the mutual information is derived. However, the expression of the mutual information is not in a closed form. Furthermore, the lower bound of the mutual information is derived in a closed form. Moreover, the theoretical expression of the bit error rate is also derived. Numerical results verify the accuracy of the derived theoretical expressions in this chapter.

Keywords: visible light communication, input-dependent noise, mutual information, bit error rate
