Novel Spatial Modulation Channel Index Detection in Optical Wireless Communications with Signal Space Diversity

A novel spatial modulation channel index detection algorithm using a joint maximum-a-posteriori estimation is proposed for optical wireless communications with 4-CAP modulation and transmitter diversity. Diversity gain, enabling improvement of about 0.4dB in SNR and 1.5-times in data rate, is achieved with reduced computation complexity.

I. Introduction

The increasing demands for remote working/education and high definition video streaming pose a significant challenge to current indoor wireless networks. Apart from the radio frequency (RF) wireless communication, line-of-sight optical wireless communication (LoS-OWC) is a promising solution [1], since it can achieve high-capacity connections with competitive advantages of scalable bandwidth, simple deployment leveraging the fiber-to-the-premise/home broadband networks, and immunity against RF interference.