Performance Analysis and Beamforming Design of a Secure Cooperative MISO-NOMA Network

Area of Science:

• Wireless Communication
• Signal Processing
• Information Security

Background:

• Non-orthogonal multiple access (NOMA) systems face security challenges, particularly for cell-edge users.
• Eavesdropping poses a significant threat to data confidentiality in wireless networks.
• Rayleigh fading channels introduce performance degradation.

Purpose of the Study:

• To enhance the security and performance of a cell-edge user in a multiple-input single-output non-orthogonal multiple-access (MISO-NOMA) system.
• To mitigate the impact of eavesdroppers with ideal detection capabilities.
• To maintain the quality of service for near users while improving cell-edge user performance.

Main Methods:

• An optimization-based beamforming scheme is proposed for MISO-NOMA systems.
• Power allocation coefficients are adjusted using a simultaneous wireless information and power transfer (SWIPT) protocol with time switching/power splitting.
• A cooperative approach is employed where the near-user forwards information to the cell-edge user.

Main Results:

• The proposed beamforming scheme significantly reduces the outage probability for the cell-edge user.
• The scheme effectively degrades the performance of the eavesdropper.
• Simulation results validate the analytical findings, demonstrating improved overall system performance.

Conclusions:

• The developed beamforming strategy effectively enhances the security and reliability of MISO-NOMA systems for cell-edge users.
• The cooperative SWIPT protocol optimizes resource allocation for improved user experience and security.
• The approach offers a robust solution for secure wireless communication in challenging fading environments.