Spatial Index Modulation Multiple Access for Multiuser MIMO-OWC Systems

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This paper presents a multi-user multiple-input multiple-output optical wireless communication (MU-MIMOOWC) system employing single/dual-mode spatial index modulation multiple access (SM/DM-SIMMA). The proposed SM/DMSIMMA schemes enable efficient two-dimensional bit allocation through distinct assignment of spatial and constellation bits to different users. Through comprehensive experiments conducted at equivalent data rates, we demonstrate that DM-SIMMA outperforms the benchmark schemes in both individual and average bit error rate (BER) performance, with particularly notable gains for low-SNR users. Furthermore, the results show that DMSIMMA achieves significant transmission distance enhancement compared to other schemes, confirming its practical advantages for MU-MIMO-OWC implementations.

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