SIMRP: Self-Interference Mitigation Using RIS and Phase Shifter Network

TL;DR

This paper introduces SIMRP, a novel method combining RIS and phase shifter networks to effectively mitigate self-interference in full-duplex systems, enhancing communication performance by preventing ADC saturation.

Contribution

The paper proposes a joint phase optimization technique using RIS and PSN for self-interference mitigation in IBFD systems, a novel approach in this context.

Findings

SIMRP effectively suppresses self-interference and prevents ADC saturation.

Simulation results show improved sum rate performance.

Joint optimization of RIS and PSN phases enhances system capacity.

Abstract

Strong self-interference due to the co-located transmitter is the bottleneck for implementing an in-band full-duplex (IBFD) system. If not adequately mitigated, the strong interference can saturate the receiver's analog-digital converters (ADCs) and hence void the digital processing. This paper considers utilizing a reconfigurable intelligent surface (RIS), together with a receiving (Rx) phase shifter network (PSN), to mitigate the strong self-interference through jointly optimizing their phases. This method, named self-interference mitigation using RIS and PSN (SIMRP), can suppress self-interference to avoid ADC saturation effectively and therefore improve the sum rate performance of communication systems, as verified by the simulation studies.