Performance analysis of dual-hop mixed RF-FSO systems combined with NOMA.

Area of Science:

• Wireless Communications
• Optical Communications
• Information Theory

Background:

• Hybrid radio frequency/free space optical (RF/FSO) systems offer enhanced bandwidth and reliability.
• Non-orthogonal multiple access (NOMA) enables efficient spectrum utilization in wireless networks.
• Relaying techniques are crucial for extending communication range and overcoming link blockages.

Purpose of the Study:

• To analyze the performance of hybrid RF/FSO systems integrated with NOMA.
• To investigate the impact of decode-and-forward (DF) relaying with successive interference cancellation (SIC) on system reliability.
• To evaluate the outage probability (OP) under Gamma-Gamma and Nakagami-m fading distributions.

Main Methods:

• System modeling of a hybrid RF/FSO communication link with a DF relay employing SIC.
• Mathematical analysis of outage probability (OP) based on channel distributions (Gamma-Gamma for FSO, Nakagami-m for RF).
• Validation of the analytical framework using Monte Carlo simulations.

Main Results:

• A direct correlation exists between the successive interference cancellation (SIC) capability and improved outage probability (OP) performance.
• System performance is significantly influenced by the parameters of the free space optical (FSO) channel.
• The proposed system demonstrates enhanced reliability through the integration of RF/FSO links and NOMA.

Conclusions:

• The integration of SIC in DF relays is a key factor for enhancing the performance of hybrid RF/FSO-NOMA systems.
• Optimizing FSO channel parameters is essential for maximizing system efficiency.
• The study provides a validated framework for designing robust hybrid wireless optical communication systems.