On Array Geometry and Self-Interference in Full-Duplex Massive MIMO Communications

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

This paper studies the role of the joint transmit-receive antenna array geometry in shaping the self-interference (SI) channel in full-duplex communications. We consider a simple spherical wave SI model and two prototypical linear array geometries with uniformly spaced transmit and receive antennas. We show that the resulting SI channel matrix has a regular (Toeplitz) structure in both of these cases. However, the number of significant singular values of these matricesan indication of the severity of SI-can be markedly different. We demonstrate that both reduced SI and high angular resolution can be obtained by employing suitable sparse array configurations that fully leverage the available joint transmit-receive array aperture without suffering from angular ambiguities. Numerical electromagnetic simulations also suggest that the worst-case SI of such sparse arrays need not increase-but can actually decrease-with the number of antennas. Our findings provide preliminary insight into the extent to which the array geometry alone can mitigate SI in full-duplex massive MIMO communications systems employing a large number of antennas.

Original languageEnglish
Title of host publicationConference Record of the 57th Asilomar Conference on Signals, Systems and Computers, ACSSC 2023
EditorsMichael B. Matthews
PublisherIEEE
Pages122-126
Number of pages5
ISBN (Electronic)979-8-3503-2574-4
DOIs
Publication statusPublished - 1 Apr 2023
MoE publication typeA4 Conference publication
EventAsilomar Conference on Signals, Systems and Computers - Pacific Grove, United States
Duration: 29 Oct 20231 Nov 2023

Publication series

NameConference Record - Asilomar Conference on Signals, Systems and Computers
ISSN (Print)1058-6393

Conference

ConferenceAsilomar Conference on Signals, Systems and Computers
Abbreviated titleACSSC
Country/TerritoryUnited States
CityPacific Grove
Period29/10/202301/11/2023

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