Bilayer Intelligent Omni-Surface-Assisted Full-Duplex Systems: Simultaneous Self-Interference Cancellation and Sum...

Area of Science:

• Wireless communication
• Metamaterials and intelligent surfaces

Background:

• Reconfigurable intelligent surfaces (RISs) offer environment reconfiguration for full-duplex (FD) systems.
• Conventional RIS-assisted FD systems face performance degradation due to coupled beamforming for self-interference cancellation (SIC) and sum rate maximization (SRM).

Purpose of the Study:

• To introduce a novel bilayer intelligent omni-surface (BIOS) structure for FD systems.
• To enable independent beamforming for enhanced SIC and SRM.
• To address the performance limitations of conventional RIS in FD systems.

Main Methods:

• Formulation of an optimization problem for simultaneous SRM and efficient SIC in BIOS-assisted FD systems.
• Proposal of a weighted mean square error (MSE) minimization with SIC algorithm.
• Joint design of base station beamforming and BIOS using manifold optimization with an SIC constraint.
• Theoretical derivation of a lower bound for BIOS size for efficient SIC.

Main Results:

• The proposed BIOS structure enables independent beams, facilitating flexible SRM and SIC.
• The weighted MSE minimization algorithm effectively solves the optimization problem.
• Simulations demonstrate that BIOS outperforms conventional RIS designs in FD systems.
• The derived lower bound for BIOS size is validated.

Conclusions:

• The BIOS structure provides a superior solution for FD systems compared to traditional RIS.
• The proposed optimization algorithm and theoretical analysis contribute to efficient wireless communication system design.
• Independent beam control in BIOS is key to overcoming performance bottlenecks in FD systems.