Self-Interference Cancellation with Phase Noise Induced ICI Suppression for Full-Duplex Systems

TL;DR

This paper introduces a digital self-interference cancellation method for full-duplex OFDM systems that effectively suppresses phase noise-induced intercarrier interference, significantly improving cancellation performance.

Contribution

It proposes a novel scheme combining phase noise estimation and suppression to enhance self-interference cancellation in full-duplex systems.

Findings

Achieves up to 9dB more cancellation than existing methods

Effectively suppresses phase noise and intercarrier interference

Demonstrates robustness under various operating conditions

Abstract

One of the main bottlenecks in practical full-duplex systems is the oscillator phase noise, which bounds the possible cancellable self-interference power. In this paper, a digitaldomain self-interference cancellation scheme for full-duplex orthogonal frequency division multiplexing systems is proposed. The proposed scheme increases the amount of cancellable selfinterference power by suppressing the effect of both transmitter and receiver oscillator phase noise. The proposed scheme consists of two main phases, an estimation phase and a cancellation phase. In the estimation phase, the minimum mean square error estimator is used to jointly estimate the transmitter and receiver phase noise associated with the incoming self-interference signal. In the cancellation phase, the estimated phase noise is used to suppress the intercarrier interference caused by the phase noise associated with the incoming self-interference signal. The performance of the proposed scheme is numerically investigated under different operating conditions. It is demonstrated that the proposed scheme could achieve up to 9dB more self-interference cancellation than the existing digital-domain cancellation schemes that ignore the intercarrier interference suppression.