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Performance analysis of Laser Communication Systems under atmospheric turbulence: a comparative study of channel models and modulation techniques
Y.D. Safitri1, A.S. Nasution1, Suhermanto1, H. Gunawan1, D.N.S. Sirin1, A. Indradjad1, Supriyono1, A. Maryanto1, Musyarofah1, M. Soleh1, A. Dempster2

1Research Center for Satellite Technology, National Research and Innovation Agency (BRIN), Bogor 16310, Indonesia;
2School of Electrical Engineering and Telecommunications, University of New South Wales, Sydney 2052, Australia

  Полный текст (PDF)

DOI: 10.18287/COJ1681

ID статьи: 1681

Аннотация:
This study examines Probability Density Functions (PDFs) of several statistical models--Lognormal, Rayleigh, Gamma-Gamma, Nakagami-m, Rice, and Negative Exponential--in relation to irradiance under weak, moderate, and strong turbulence conditions. Each model exhibits unique characteristics crucial to Free-Space Optical (FSO) communication performance. Lognormal distribution suggests a high probability of low irradiance values, while Rayleigh and Rice show bell-shaped curves. Gamma-Gamma and Nakagami-m offer greater flexibility, displaying moderate peaks and gradual declines. Negative Exponential distribution shows a rapid decay, particularly in random scattering scenarios. Bit Error Rate (BER) performance is evaluated based on instantaneous signal-to-noise ratio (SNR(I)) for various modulation schemes. Among these, 16-Pulse Position Modulation (16-PPM) proves the most robust, followed by Binary Phase Shift Keying (BPSK) and 8-Phase Shift Keying (8-PSK), which also demonstrate strong performance. Differential Phase Shift Keying (DPSK) and 16-Quadrature Amplitude Modulation (16-QAM) offer a balance between performance and spectral efficiency, while 4-Pulse Amplitude Modulation (4-PAM) is highly sensitive to noise. The study reveals that Rayleigh and Rice distributions perform poorly in moderate and strong turbulence, while Nakagami-m and Gamma-Gamma perform better, with Gamma-Gamma excelling in weak and strong turbulence, and Nakagami-m in moderate conditions. At higher SNR(I) levels, BER performance converges across models, minimizing the impact of channel model on modulation scheme's performance.

Ключевые слова:
Optical, laser, FSO, channel model, modulation, turbulence.

Благодарности:
The authors express their gratitude to BRIN's Research Center for Satellite Technology, the University of Indonesia, and the University of New South Wales for providing essential resources for this study.

Цитирование:
Safitri YD, Nasution AS, Suhermanto, Gunawan H, Sirin DNS, Indradjad A, Supriyono, Maryanto A, Musyarofah, Soleh M, Dempster A. Performance analysis of Laser Communication Systems under atmospheric turbulence: a comparative study of channel models and modulation techniques. Computer Optics 2025; 50 (1): 1681. DOI: 10.18287/COJ1681.

Citation:
Safitri YD, Nasution AS, Suhermanto, Gunawan H, Sirin DNS, Indradjad A, Supriyono, Maryanto A, Musyarofah, Soleh M, Dempster A. Performance analysis of Laser Communication Systems under atmospheric turbulence: a comparative study of channel models and modulation techniques. Computer Optics 2025; 50 (1): 1681. DOI: 10.18287/COJ1681.

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