In this paper a hybrid PPM-BPSK modulation scheme is proposed. The numerical simulation results for the bit error rate (BER) performance of the PPM-BPSK modulation scheme in the lognormal atmospheric channel for a range of turbulence variance is presented. Results are compared with the BPSK-subcarrier intensity modulation (SIM) and 4-PPM, which shows the performance of the hybrid PPM-BPSK scheme, is superior to the BPSK while having the same bandwidth requirement. However, for all level of turbulence the performance of the proposed hybrid PPM-BPSK is deficient to the PPM scheme. Moreover the paper also presents the experimental results for 4PPM and BPSK (SIM).
This paper reports experimental results for the performance of a free space optical (FSO) communication link employing a binary-phase-shift-keying subcarrier modulation (BPSK) scheme under the influence of the atmospheric scintillation. A dedicated experimental atmospheric simulation chamber has been built where the effects of weak turbulence regimes on the FSO link can be investigated. The experimental data obtained is compared to the theoretical prevision. The paper also presents how data transmission performance depends on the position of turbulence source within the chamber.
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