期刊
JOURNAL OF LIGHTWAVE TECHNOLOGY
卷 39, 期 21, 页码 6746-6758出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2021.3108532
关键词
Optical transmitters; Adaptive optics; Probability density function; Bit error rate; Apertures; Visible light communication; Signal to noise ratio; Free-space optical communications; recon- figurable intelligent surfaces; unified Gamma-Gamma turbulence channels with pointing errors; average bit error rate; ergodic channel capacity; outage probability
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Engineering and Physical Sciences Research Council (EPSRC) of U.K. [EP/R007101/1]
- Royal Society
- Spanish National Project IRENE-EARTH [PID2020-115323RB-C33]
This paper addresses the skip-zone problem in terrestrial free-space optical (T-FSO) systems using a single-element reconfigurable intelligent surface (RIS). Performance analysis of RIS-aided T-FSO links under turbulence and pointing errors is conducted, with numerical results indicating that RIS-based T-FSO performs better when the RIS module is located near the transmitter.
One of the main problems faced by communication systems is the presence of skip-zones in the targeted areas. With the deployment of the fifth-generation mobile network, solutions are proposed to solve the signal loss due to obstruction by buildings, mountains, and atmospheric or weather conditions. Among these solutions, reconfigurable intelligent surfaces (RIS), which are newly proposed modules, may be exploited to reflect the incident signal in the direction of dead zones, increase communication coverage, and make the channel smarter and controllable. This paper tackles the skip-zone problem in terrestrial free-space optical (T-FSO) systems using a single-element RIS. Considering link distances and jitter ratios at the RIS position, we carry out a performance analysis of RIS-aided T-FSO links affected by turbulence and pointing errors, for both heterodyne detection and intensity modulation-direct detection techniques. Turbulence is modeled using the Gamma-Gamma distribution. We analyze the model and provide exact closed-form expressions of the probability density function, cumulative distribution function, and moment generating function of the end-to-end signal-to-noise ratio. Capitalizing on these statistics, we evaluate the system performance through the outage probability, ergodic channel capacity, and average bit error rate for selected binary modulation schemes. Numerical results, validated through simulations, obtained for different RIS positions and link distances ratio values, reveal that RIS-based T-FSO performs better when the RIS module is located near the transmitter.
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