BER analysis and capacity evaluation of FSO system using hybrid subcarrier intensity modulation with receiver spatial diversity over log-normal and gamma–gamma channel model
- 34 Downloads
In this work, the performance of free space optical system is evaluated in terms of bit error rate (BER) and capacity using PPM–BPSK–SIM (hybrid-SIM) modulation scheme. Addition to that, we have applied spatial diversity technique for the proposed system. We have calculated the BER and the capacity at various atmospheric turbulence levels over the log-normal and gamma–gamma channel models. The analysis has been carried out at different signal-to-noise-ratio (SNR) values and link distances. The simulation results show that hybrid-SIM modulation scheme achieves better BER performance than BPSK–SIM scheme in both the channel models; furthermore, the BER performance gets improved significantly by spatial diversity technique.
KeywordsSubcarrier-intensity-modulation (SIM) Free-space-optics (FSO) Signal-to-noise-ratio (SNR) Capacity Scintillation Bit error rate (BER)
- Adamchik, V., Marichev, O.: The algorithm for calculating integrals of hypergeometric type functions and its realization in reduce system. In: Proceedings of the International Symposium on Symbolic and Algebraic Computation, pp. 212–224. ACM (1990)Google Scholar
- Ghassemlooy, Z., Popoola, W., Rajbhandari, S.: Optical Wireless Communications: System and Channel Modelling with Matlab®. CRC Press, Boca Raton (2012)Google Scholar
- Liu, H., Liao, R., Wei, Z., Hou, Z., Qiao, Y.: Ber analysis of a hybrid modulation scheme based on PPM and MSK subcarrier intensity modulation. IEEE Photonics J. 7(4), 1–10 (2015)Google Scholar