Work

Gradient-Adaptive 2-D LUT Method for 6G Flexible-Duplex

Year: 2024

Type: article

Abstract: In this letter, we propose a novel self-interference (SI) cancellation solution for asymmetric in-band full-duplex (IBFD) systems, where the downlink (DL) signals are noncontiguously aggregated within the available band. The method builds on a Hammerstein model with parallel spline-interpolated 2-D lookup tables (LUTs), together with efficient gradient-descent parameter learning rules. The provided RF measurement results harnessing a GaN Doherty power amplifier (PA) at 3.5 GHz demonstrate digital SI cancellation levels up to 35 dB, with substantially reduced processing complexity compared with the reference polynomial model. These methods and results pave the way toward enhanced duplexing capabilities and flexibility in the emerging 6G era.

Source: IEEE Microwave and Wireless Technology Letters

DOI: 10.1109/lmwt.2024.3452491

Authors: Vesa Lampu, Lauri Anttila, Matias Turunen, Mikko Valkama

Institutions: Tampere University, University of Tampere

Language: English

Topic: Full-Duplex Wireless Communications

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $2,495

Funder: Academy of Finland