Journal ArticleDOI
Analysis of RIS-Based Terrestrial-FSO Link Over G-G Turbulence With Distance and Jitter Ratios
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TLDR
Numerical results reveal that RIS-based T-FSO performs better when the RIS module is located near the transmitter, and the system performance through the outage probability, ergodic channel capacity, and average bit error rate for selected binary modulation schemes is evaluated.Abstract:
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.read more
Citations
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Journal ArticleDOI
Evaluation of Reconfigurable Intelligent Surface-Assisted Underwater Wireless Optical Communication System
Ramavath Prasad Naik,W. H. Chung +1 more
TL;DR: In this paper , the authors analyzed the bit error rate (BER), outage probability (OP) and channel capacity under the influence of underwater turbulence, beam attenuation, pointing errors and occlusion or blockage due to obstacles.
Journal ArticleDOI
On the Design of RIS–UAV Relay-Assisted Hybrid FSO/RF Satellite–Aerial–Ground Integrated Network
TL;DR: In this article, an additional UAV is deployed to diverse the free-space optics (FSO)/radio-frequency (RF) link from the HAP-to-ground station to avoid cloud blockage while maintaining a high-speed connection of the FSO link.
Journal ArticleDOI
Performance Analysis of RIS-Assisted FSO Communications over Fisher–Snedecor F Turbulence Channels
TL;DR: A performance evaluation of a free-space optical re-configurable intelligent surface (RIS)-assisted communications (ACs) link over the F-S F TI fading channels, assuming the intensity modulation–direct detection (IM–DD) technique.
Journal ArticleDOI
On the Design of RIS-UAV Relay-Assisted Hybrid FSO/RF Satellite-Aerial-Ground Integrated Network
TL;DR: In this article , an additional UAV is deployed to diverse the free-space optics (FSO)/radio-frequency (RF) link from the HAP-to-ground station to avoid cloud blockage while maintaining a high-speed connection of the FSO link.
Journal ArticleDOI
Modeling and Design of IRS-Assisted Multilink FSO Systems
TL;DR: In this article , the authors investigate the modeling and design of intelligent reflecting surface (IRS)-assisted optical communication systems, which can circumvent the line-of-sight (LOS) requirement in multi-link free space optical (FSO) systems.
References
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Journal ArticleDOI
Reconfigurable Intelligent Surface-Based Index Modulation: A New Beyond MIMO Paradigm for 6G
TL;DR: In this article, RIS-assisted communications to the realm of index modulation (IM) by proposing RIS-space shift keying and RIS-spatial modulation (RIS-SM) schemes are proposed, and a unified framework is presented for the derivation of their theoretical average bit error probability.
Journal ArticleDOI
Average Rate of Downlink Heterogeneous Cellular Networks over Generalized Fading Channels: A Stochastic Geometry Approach
TL;DR: An analytical framework to compute the average rate of downlink heterogeneous cellular networks is introduced, which avoids the computation of the Coverage Probability (Pcov) and needs only the Moment Generating Function (MGF) of the aggregate interference at the probe mobile terminal.
Journal ArticleDOI
On the Performance of RIS-Assisted Dual-Hop UAV Communication Systems
TL;DR: Results show that the use of RISs can effectively improve the coverage and reliability of UAV communication systems.
Journal ArticleDOI
Sum Rate Maximization for IRS-Assisted Uplink NOMA
TL;DR: Numerical results show that the proposed NOMA-based scheme achieves a larger sum rate than orthogonal multiple access (OMA)-based one, and the impact of the number of reflecting elements on the sum rate is revealed.
Journal ArticleDOI
Dual-Hop FSO Transmission Systems Over Gamma–Gamma Turbulence With Pointing Errors
TL;DR: The end-to-end performance of dual-hop free-space optical (FSO) fixed gain relaying systems under heterodyne detection and intensity modulation with direct detection techniques in the presence of atmospheric turbulence as well as pointing errors is analyzed.