Location-based Initial Access for Wireless Power Transfer with Physically Large Arrays

Benjamin J. B. Deutschmann*, Thomas Wilding, Erik G. Larsson, Klaus Witrisal

*Corresponding author for this work

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


Radio frequency (RF) wireless power transfer (WPT) is a promising technology for 6G use cases. It enables a massive yet sustainable deployment of batteryless energy neutral (EN) devices at an unprecedented scale. Recent research on 6G is exploring high operating frequencies up to the THz spectrum, where antenna arrays with large apertures are capable of forming narrow, 'laser-like' beams. At sub-10 GHz frequencies, physically large antenna arrays are considered that are operating in the array near field. Transmitting spherical wavefronts, power can be focused to a focal point rather than a beam, which allows for efficient and radiation-safe WPT. We formulate a multipath channel model comprising specular components and diffuse scattering to find the WPT power budget in a realistic indoor scenario. Specular components can be predicted by means of a geometric model. This is used to transmit power via multiple beams simultaneously, increasing the available power budget and expanding the initial access distance. We show that exploiting this 'beam diversity' reduces the required fading margin for the initial access to EN devices.

Original languageEnglish
Title of host publication2022 IEEE International Conference on Communications Workshops (ICC Workshops)
Number of pages6
ISBN (Electronic)9781665426718
Publication statusPublished - May 2022
Event2022 IEEE International Conference on Communications: IEEE ICC 2022 - Coex - 513 Yeongdong-daero, Gangnam-gu, Seoul, South Korea, Seoul, Korea, Republic of
Duration: 16 May 202220 May 2022


Conference2022 IEEE International Conference on Communications
Abbreviated titleIEEE ICC 2022
Country/TerritoryKorea, Republic of
Internet address


  • 6G
  • array near field
  • wireless power transfer
  • initial access
  • beam diversity
  • large intelligent surfaces
  • distributed MIMO
  • distributed massive MIMO

ASJC Scopus subject areas

  • Artificial Intelligence
  • Control and Optimization
  • Signal Processing
  • Computer Networks and Communications

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