Analog Beamforming Codebooks for Wideband Full-Duplex Millimeter-Wave Systems

TL;DR

This paper introduces novel analog beamforming codebooks for wideband full-duplex mmWave systems that effectively mitigate beam squint and frequency-selective self-interference, enabling higher spectral efficiency.

Contribution

First to design analog beamforming codebooks specifically addressing beam squint and frequency-selectivity in wideband full-duplex mmWave systems.

Findings

Lower self-interference with the proposed codebooks.

Improved coverage across 6 GHz bandwidth.

Enhanced SINRs and spectral efficiencies.

Abstract

In full-duplex millimeter-wave (mmWave) systems, the effects of beam squint and the frequency-selectivity of self-interference exacerbate over wide bandwidths. This complicates the use of beamforming to cancel self-interference when communicating over bandwidths on the order of gigahertz. In this work, we present the first analog beamforming codebooks tailored to wideband full-duplex mmWave systems, designed to both combat beam squint and cancel frequency-selective self-interference. Our proposed design constructs such codebooks by minimizing self-interference across the entire band of interest while constraining the coverage provided by these codebooks across that same band. Simulation results using computational electromagnetics to model self-interference suggest that a full-duplex 60 GHz system with our design enjoys lower self-interference and delivers better coverage across bandwidths as wide as 6 GHz, when compared to similar codebook designs that ignore beam squint and/or frequency-selectivity. This allows our design to sustain higher SINRs and spectral efficiencies across wide bandwidths, unlocking the potentials of wideband full-duplex mmWave systems.