Average bit error rate (BER) performance of on-off keying (OOK) modulation in a free space optical (FSO) system, which is based on adaptive threshold technique under atmospheric turbulence described by exponentiated Weibull (EW) distribution, is studied and compared with that of using fixed threshold technique. In order to solve the adaptive threshold, the equation is simplified by using the generalized Gauss-Laguerre polynomial function, which significantly improves the operational efficiency. The simulation results show that the adaptive threshold varies with the average transmitted power under different noise variances, receiving aperture sizes and turbulence conditions. Compared with the fixed threshold technique, the adaptive threshold technique can greatly improve the BER performance of FSO communication system.
2. Yi, X., C. Shen, P. Yue, Y. M. Wang, Q. Q. Ao, and P. Zhao, "Performance analysis for a mixed RF and multihop FSO communication system in 5G C-RAN," J. Opt. Commun. Netw., Vol. 11, No. 8, 452-464, 2019.
doi:10.1364/JOCN.11.000452
3. Vitasek, J., J. Latal, S. Hejduk, J. Bocheza, P. Koudelka, J. Skapa, P. Siska, and V. Vasinek, "Atmospheric turbulences in free space optics channel," IEEE TSP, 104-107, 2011.
4. Vitasek, J., E. Leitgeb, T. David, J. Latal, and S. Hejduk, "Misalignment loss of free space optic link," ICTON , 2014.
5. Han, L.Q. and Y. H. You, "Performance of free space optical communication with combined effects from atmospheric turbulence and pointing errors," Acta Optica Sinica, Vol. 34, No. 11, 82-87, 2014.
6. Yi, X., Z. J. Liu, and P. Yue, "Average BER of free-space optical systems in turbulent atmosphere with exponentiated Weibull distribution," Opt. Lett., Vol. 37, No. 24, 5142-5144, 2012.
doi:10.1364/OL.37.005142
7. Yi, X. and M. W. Yao, "Free-space communications over exponentiated Weibull turbulence channels with nonzero boresight pointing errors," Opt. Express, Vol. 23, No. 3, 2904-2917, 2015.
doi:10.1364/OE.23.002904
8. Wang, P., L. Zhang, L. X. Guo, F. Huang, T. Shang, R. R. Wang, and Y. T. Yang, "Average BER of subcarrier intensity modulated free space optical systems over the exponentiated Weibull fading channels," Opt. Express, Vol. 22, No. 17, 20828-20841, 2014.
doi:10.1364/OE.22.020828
9. Sharma, P. , K., A. Bansal, P. Garg, T. A. Tsiftsis, and R. Barrios, "Performance of FSO links under exponentiated Weibull turbulence fading with misalignment errors," IEEE ICC, 5110-5114, 2015.
10. Anbarasi, K., C. Hemanth, and R. G. Sangeetha, "A review on channel models in free space optical communication systems," Opt. Laser Technol., Vol. 97, 161-171, 2017.
doi:10.1016/j.optlastec.2017.06.018
11. Zhao, J., S. H. Zhao, W. H. Zhao, Y. J. Li, Y. Liu, and X. Li, "Average capacity of airborne optical links over exponentiated Weibull atmospheric turbulence channels," Opt. Quant. Electron., Vol. 49, No. 3, 104, 2017.
doi:10.1007/s11082-017-0927-5
12. Fu, H. , H., P. Wang, T. Liu, T. Cao, L. X. Guo, and J. Qin, "Performance analysis of a PPMFSO communication system with an avalanche photodiode receiver over atmospheric turbulence channels with aperture averaging," Appl. Opt., Vol. 56, No. 23, 6432-6439, 2017.
doi:10.1364/AO.56.006432
13. Balaji, K. A. and K. Prabu, "Performance evaluation of FSO system using wavelength and time diversity over malaga turbulence channel with pointing errors," Opt. Commun. , Vol. 410, 643-651, 2018.
doi:10.1016/j.optcom.2017.11.006
14. Li, K. N., B. Lin, and J. Ma, "Bit-error rate investigation of satellite-to-ground downlink optical communication employing spatial diversity and modulation techniques," Opt. Commun. , Vol. 442, 123-131, 2019.
doi:10.1016/j.optcom.2019.03.012
15. Wu, Y., H. P. Mei, C. M. Dai, F. M. Zhao, and H. L. Wei, "Design and analysis of performance of FSO communication system based on partially coherent beams," Opt. Commun., Vol. 472, 126041, 2020.
doi:10.1016/j.optcom.2020.126041
16. Popoola, W. O., Z. Ghassemlooy, J. I. H. Allen, E. Leitgeb, and S. Ga, "Free-space optical communication employing subcarrier modulation and spatial diversity in atmospheric turbulence channel," IET Optoelectron., Vol. 2, No. 1, 16-23, 2008.
doi:10.1049/iet-opt:20070030
17. Geng, D. X., P. F. Du, W. Wang, G. Gao, T. Wang, and M. L. Gong, "Single laser free-space duplex communication system with adaptive threshold technique and BER analysis in weak turbulent atmosphere," Opt. Lett., Vol. 39, No. 13, 3950-3953, 2014.
doi:10.1364/OL.39.003950
18. Li, X. , Y., X. H. Zhao, and P. Zhang, "Bit error rate analysis for modulating Retro-Reflctor free space optical communications with adaptive threshold over correlated gamma gamma fading channels," IEEE Commun. Lett. , Vol. 23, No. 12, 2275-2278, 2019.
doi:10.1109/LCOMM.2019.2943868
19. Barrios, R. and F. Dios, "Exponentiated Weibull distribution family under aperture averaging for Gaussian beam waves," Opt. Express, Vol. 20, No. 12, 13055-13064, 2012.
doi:10.1364/OE.20.013055
20. Barrios, R. and F. Dios, "Exponentiated Weibull model for the irradiance probability density function of a laser beam propagating through atmospheric turbulence," Opt. Laser Technol., Vol. 45, 13-20, 2013.
doi:10.1016/j.optlastec.2012.08.004
21. Mudholkar, G. S. and D. K. Srivastava, "Exponentiated Weibull family for analyzing bathtub failure-rate data," IEEE Trans. Reliab., Vol. 42, No. 2, 299-302, 1993.
doi:10.1109/24.229504
22. Press, W. H., S. A. Teukolsky, W. A. Vetterling, and B. P. Flannery, Numerical Recipies in C: The Art of Scientific Computing, Cambridge Univ., Cambridge, 1992.
Submit
