Abstract
A position-marked layered optical spatial modulation (P-MLOSM) scheme is proposed to improve the spatial resource (SR) utilization and optimize the bit error rate (BER) of existing optical spatial modulation (OSM) systems. In the proposed scheme, the layered spatial structure increases the lasers utilization rate, and the time slots within each period of pulse position modulation (PPM) are extended to distinguish different layers in order to guaranteeing BER performance. The BER upper bound of P-MLOSM scheme is derived under the Gamma-Gamma fading channel and simulated by Monte Carlo method. Simulation results show that the BER performance of (5$\times$ 4-2-2) PMLOSM system is improved by about 1.5 dB at BER=1$\times10^{-4}$ compared with that of (5$\times$ 4-2-2) layered optical spatial modulation (LOSM) system.
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