Near-Field Beamforming for Large Intelligent Surfaces

Sha Hu, Mehmet C. Ilter*, Hao Wang

*Corresponding author for this work

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

6 Citations (Scopus)
275 Downloads (Pure)

Abstract

In this paper, we propose a novel near-field beamforming (BF) design with a Large Intelligent Surface (LIS) that is implemented as a discretized 2D-array. We first investigate the definitions of the near-field and far-field regions, and determine the Fraunhofer distance of the LIS, which scales up linearly in the surface-area of the LIS. Hence, a user-equipment (UE) can enter the near-field of a LIS in practice. In addition to Fraunhofer distance, we further derive the Fresnel near-field region where both amplitude and angle variations are negligible, as long as the distance from the UE to the LIS is larger than a threshold, which only scales up linearly in the diameter of LIS. Therefore, in the majority region of near-field, only phase variations worsen the the quality of received signal and result in significant array-gain losses. Motivated by this observation, we further propose a two-step near-field BF design that can effectively recover the array-gain losses in Fresnel near-field, and is fully compatible with a conventional far-field BF.

Original languageEnglish
Title of host publication2022 IEEE 33rd Annual International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2022
PublisherIEEE
Pages1367-1373
Number of pages7
ISBN (Electronic)978-1-6654-8053-6
DOIs
Publication statusPublished - 2022
MoE publication typeA4 Conference publication
EventIEEE International Symposium on Personal, Indoor and Mobile Radio Communications - Virtual, Online, Japan
Duration: 12 Sept 202215 Sept 2022

Publication series

NameIEEE International Symposium on Personal, Indoor and Mobile Radio Communications
Volume2022-September
ISSN (Electronic)2166-9589

Conference

ConferenceIEEE International Symposium on Personal, Indoor and Mobile Radio Communications
Abbreviated titlePIMRC
Country/TerritoryJapan
CityVirtual, Online
Period12/09/202215/09/2022

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