Pointing error effects on performance of free-space optical communication systems using SC-QAM signals over atmospheric turbulence channels |
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| Affiliation: | 1. School of Electronics and Telecommunications, Hanoi University of Science and Technology, 405/C9, No. 1, Dai Co Viet Street, Hanoi 10000, Viet Nam;2. Computer Communications Lab, The University of Aizu, Tsuruga, Ikki-machi, Aizu-Wakamatsu shi, Fukushima-ken 965-8580, Japan;1. Department of Electrical Engineering, Malayer University, Malayer 65719-95863, Iran;2. Electrical and Computer Engineering Department, American University in Dubai, Dubai, United Arab Emirates;3. Department of Computing, University of Surrey, Surrey GU2 7XH, UK;1. School of Astronautics & Aeronautics, University of Electronic Science and Technology of China, Chengdu 611731, Sichuan, China;2. Research & Development Center, China Academy of Space technology (Xi’an Branch), Xi’an 710036, Shanxi, China;1. Department of Applied Physics, University of Tianjin, Tianjin 300072, PR China;2. Key Laboratory of Science and Technology on Photo-electric Information Safety Control, Yanjiao, Hebei 605201, PR China;1. Department of Electronics and Communication Engineering, National Institute of Technology (NIT) , Tiruchirappalli 620015, India;2. Department of Electrical, Electronic & Computer Engineering, University of Pretoria, South Africa |
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| Abstract: | In this paper, we theoretically analyze pointing error effects on performance of free-space optical (FSO) communication systems using subcarrier intensity quadrature amplitude modulation (SC-QAM) signals over atmospheric turbulence channels. Unlike previous studies, we take into account both atmospheric turbulence channels and the pointing error effect. In order to model atmospheric turbulence channels, we employ a log-normal distribution for weak-to-moderate turbulent condition and a gamma–gamma distribution for strong turbulent condition. Moreover, we study the pointing error effect by taking into account the influence of beamwidth, aperture size and jitter variance. In addition, we use a combination of these models to analyze the combined effect of atmospheric turbulence and pointing error to FSO/SC-QAM systems. Finally, we derive analytical expressions to evaluate the average symbol error rate (ASER) performance of such systems. Numerical results present the impact of pointing error on the performance of FSO/SC-QAM systems and how we use proper values of aperture size and beamwidth to improve the performance of such systems. In addition, simulation results of FSO/SC-QAM performance over strong atmospheric turbulence and pointing errors show that the closed-form expression can provide a precision for evaluating ASER of such systems. |
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| Keywords: | Average symbol error rate (ASER) Free-space optical (FSO) communications Subcarrier quadrature amplitude modulation (SC-QAM) Atmospheric turbulence Pointing errors |
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