Multiple sub-carrier optical wireless systems

A comparative study of various multiple sub-carrier modulation (MSM) techniques suitable for optical wireless communication systems is presented. The key features of each modulation scheme are examined in the context of employability for multi-spectral optical wireless applications. A review of recent techniques for improving power efficiency of MSM systems is also presented. As a special case of MSM, the performance of orthogonal frequency division multiplexing (OFDM) scheme in an optical wireless channel is examined and several techniques to reduce the peak-to-average power ratio (PAPR), employed for the wireless radio domain, are studied for suitability of implementation in the multi-spectral indoor optical wireless environment.