Optical Spatial Modulation with Improved Energy Harvesting for MIMO FSO Communications

This work targets the performance analysis of optical spatial modulation (OSM) for free-space optical (FSO) communication systems under the exact Poisson photon-counting detection model. We derive the error probability in the case of receivers equipped with multiple apertures where we analyze and compare different combining schemes. This paper also focuses on the energy harvesting (EH) in OSM FSO systems. In particular, we evaluate the error performance and EH levels with the conventional pulse position modulation (PPM) and with the more recent EH-efficient pulse gap modulation (PGM). We also advise novel averaging-based and switching-based EH architectures for multi-aperture receivers and we compare the EH capabilities of these schemes.