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Unified performance analysis of interference-limited and interference-free dual-hop mixed RF/FSO systems with partial
Optics Express
|February 1, 2024
Summary
This study analyzes hybrid radio frequency/free space optical systems using partial relay selection. New formulas quantify performance impacts from interference and pointing errors, validating system efficiency.
Area of Science:
- Wireless Communication Systems
- Optical Communication Networks
- Signal Processing
Background:
- Hybrid RF/FSO systems offer enhanced reliability and capacity.
- Partial Relay Selection (PRS) and Variable-Gain (VG) amplify-and-forward (AF) relaying are crucial for performance optimization.
- Accurate channel modeling is essential for analyzing complex communication environments.
Purpose of the Study:
- To investigate the performance of dual-hop mixed RF/FSO systems with PRS and VG AF relaying under interference-limited and interference-free conditions.
- To develop a generalized analytical framework for accurate channel characterization.
- To derive unified closed-form expressions for system performance metrics.
Main Methods:
- Modeling the RF link using the κ-μ shadowed distribution.
- Representing the FSO link using Fox's H-function, unifying various atmospheric turbulence models.
- Modeling interference signals with independent identically κ-μ shadowed distributions.
- Deriving closed-form expressions for Cumulative Distribution Function (CDF), Average Bit Error Rate (BER), and Ergodic Capacity.
- Providing asymptotic expressions for Average BER at high Signal-to-Noise Ratio (SNR).
Main Results:
- Unified closed-form expressions for CDF, Average BER, and Ergodic Capacity were derived.
- Asymptotic expressions for Average BER at high SNR were obtained.
- The analysis quantified the impact of co-channel interference, pointing errors, number of relays, and selected relay rank on system performance.
Conclusions:
- The derived analytical framework provides a generalized approach for studying mixed RF/FSO systems.
- Numerical and Monte Carlo simulation results validate the accuracy of the derived expressions.
- The study offers valuable insights into optimizing the performance of hybrid wireless-optical communication systems.
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