Spatial Modulation Applied to Optical Wireless Communications in Indoor LOS Environments
In this paper, the authors study the performance of Spatial Modulation (SM) applied to Optical Wireless Communications (OWC) in indoor environments with Line-Of-Sight (LOS) characteristics. To this end, they consider setup scenarios with different numbers of optical transmitters and receivers which are arranged within a room. SM is compared to Repetition Coding (RC). Because RC is known to achieve very good performance in OWC systems due to the use of intensity modulation and the resulting constructive superposition of the power signals. The results show that SM can outperform RC when high spectral efficiencies are desirable, e.g. 4 bit/s/Hz and greater, since it can operate with reduced signal modulation orders by conveying additional data bits in the spatial domain.