We report the performance comparison of mode division multiplexing (MDM)-based radio over free space optics (RoFSO) transmission system using different modulation formats viz. alternate mark inversion, nonreturn to zero (NRZ), return to zero-differential phase shift keying (RZ-DPSK), and NRZ-DPSK under varying atmospheric turbulence conditions and data transmission rates. The results show that the NRZ-DPSK modulation format performs considerably better as compared to other modulation formats. Furthermore, the enhanced performance of the proposed NRZ-DPSK modulation-based MDM-RoFSO transmission system is investigated under different weather conditions and the results are compared with previously reported works.
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Singh et al. (2019) studied this question.
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