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Performance analysis of a RIS-assisted RoFSO communication system over Malaga distribution for smart city
Applied Optics
|September 14, 2023
Summary
Reconfigurable intelligent surfaces (RIS) overcome signal blocking in Radio over Free Space Optics (RoFSO) for 5G smart cities. This technology enhances communication reliability and coverage by creating new line-of-sight connections.
Area of Science:
- Optical Communications
- Wireless Networking
- Smart City Technologies
Background:
- Radio over Free Space Optics (RoFSO) is a key technology for 5G smart city services.
- A significant limitation of RoFSO is the occurrence of signal blockages due to its line-of-sight (LOS) requirement, creating coverage gaps.
- Existing solutions struggle to maintain consistent connectivity in dynamic urban environments.
Purpose of the Study:
- To propose and analyze a Reconfigurable Intelligent Surface (RIS) assisted RoFSO system.
- To overcome the connection difficulties and signal blocking issues inherent in traditional RoFSO systems.
- To enhance communication channel coverage, intelligence, and controllability for 5G applications.
Main Methods:
- Performance analysis using heterodyne detection.
- Modeling of atmospheric turbulence using Malaga distribution.
- Derivation of exact closed-form expressions for end-to-end signal-to-noise ratio (SNR) probability density function (PDF) and cumulative distribution function (CDF).
- Investigation of system performance metrics including outage probability, ergodic channel capacity, and bit error rate (BER) for various modulation schemes (MQAM, NBFSK, CBFSK).
Main Results:
- The RIS-assisted RoFSO system effectively overcomes signal blocking by generating new LOS connections.
- The derived statistical models accurately represent system performance under various turbulence conditions, link lengths, and scattering errors.
- Numerical results demonstrate significant improvements in performance metrics compared to traditional RoFSO.
Conclusions:
- The proposed RIS-assisted RoFSO technology offers a viable solution to enhance connectivity for 5G smart city applications.
- RIS modules provide intelligent and controllable extension of communication channel coverage, mitigating LOS limitations.
- The system shows strong potential for reliable and robust wireless communication in urban environments.
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