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

Yunxia Zhou¹, Qiucen Wu¹, Yu Zhu¹

¹School of Information Science and Technology, Fudan University, Shanghai 200433, China.

Sensors (Basel, Switzerland)

|July 27, 2024

Summary

A novel bilayer intelligent omni-surface (BIOS) enhances full-duplex (FD) systems by enabling independent beams for better self-interference cancellation (SIC) and sum rate maximization (SRM). This BIOS design overcomes limitations of traditional reconfigurable intelligent surfaces (RISs).

Keywords:

beamforming bilayer intelligent omni-surface full duplex self-interference cancellation sum-rate maximization

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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.