CSNOMA: Carrier Sense Non-Orthogonal Multiple Access

Area of Science:

• Wireless communication networks
• Network protocols
• Signal processing

Background:

• Existing wireless networks face challenges with spectral efficiency and interference management.
• Cross-layer designs offer potential for optimizing performance by integrating different network layers.
• Interference cancellation is a key technique for improving signal reception in dense environments.

Purpose of the Study:

• To investigate a cross-layer design for distributed random access schemes.
• To propose and evaluate a novel multiple access protocol, CSNOMA.
• To enhance area spectral efficiency in wireless networks.

Main Methods:

• Developed a new protocol: Carrier Sense Non-Orthogonal Multiple Access (CSNOMA).
• Modeled spatially randomly distributed interferers to simulate realistic interference conditions.
• Analyzed protocol performance against Carrier Sense Multiple Access (CSMA).
• Designed a signaling scheme compatible with IEEE 802.11 Distributed Coordination Function (DCF).

Main Results:

• CSNOMA demonstrates superior area spectral efficiency compared to CSMA.
• Performance gains of CSNOMA increase with higher node densities.
• The proposed signaling design is practical and integrates with existing standards.

Conclusions:

• CSNOMA offers a significant improvement in wireless network capacity.
• Cross-layer optimization integrating PHY and MAC layers is effective for random access.
• The proposed protocol provides a viable solution for future high-density wireless systems.