Digital Cancelation of Self-Interference for Single-Frequency Full-Duplex Relay Stations via Sampled-Data Control

TL;DR

This paper introduces a sampled-data control approach for digital cancellation of self-interference in full-duplex relay stations, modeling the system as continuous-time and designing robust digital filters using H-infinity control theory.

Contribution

It presents a novel sampled-data control design for self-interference cancellation in full-duplex relays, considering intersample behavior and robustness to multipath interference.

Findings

Effective cancellation of coupling waves demonstrated through simulations

Robust control against unknown multipath interference achieved

Modeling as continuous-time improves cancellation accuracy

Abstract

In this article, we propose sampled-data design of digital filters that cancel the continuous-time effect of coupling waves in a single-frequency full-duplex relay station. In this study, we model a relay station as a continuoustime system while conventional researches treat it as a discrete-time system. For a continuous-time model, we propose digital feedback canceler based on the sampled-data H-infinity control theory to cancel coupling waves taking intersample behavior into account. We also propose robust control against unknown multipath interference. Simulation results are shown to illustrate the effectiveness of the proposed method.