Air-Induced Passive Intermodulation in FDD Networks: Modeling, Cancellation and Measurements

Vesa Lampu, Lauri Anttila, Matias Turunen, Marko Fleischer, Jan Hellmann, Mikko Valkama

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

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Abstract

In this paper, we consider the effects of air-induced passive intermodulation (PIM) in frequency division duplexing (FDD) transceiver systems. Specifically, we are focusing on the issue in multiantenna frequency range 1 (FR-1) base station (BS) systems. The air-induced PIM is a special case of intermodulation distortion, which stems from metallic objects within the radiation pattern of the transceiver system, due to so-called "rusty bolt" effect, where the induced nonlinear distortion is reflected back to the receiver. In order to cancel the received PIM, we develop a model for the perceived interference at the receiver of the BS and utilize the model to produce an estimate of the PIM signal, and to suppress it from the received data. To verify the proposed air-PIM modeling and cancellation scheme, extensive experimentation is carried out with an FDD capable transceiver system at NR band n3. The experiments show great promise in the achievable PIM cancellation levels, as the received air-induced PIM can be suppressed by more than 20 dB with the developed digital cancellation solution.
Original languageEnglish
Title of host publication2021 55th Asilomar Conference on Signals, Systems, and Computers
PublisherIEEE
Pages983-988
ISBN (Electronic)978-1-6654-5828-3
ISBN (Print)978-1-6654-5829-0
DOIs
Publication statusPublished - 2022
Publication typeA4 Article in a conference publication
EventAsilomar Conference on Signals, Systems, and Computers - Pacific Grove, United States
Duration: 31 Oct 20213 Nov 2021

Publication series

NameAsilomar Conference on Signals, Systems, and Computers proceedings
ISSN (Electronic)1058-6393

Conference

ConferenceAsilomar Conference on Signals, Systems, and Computers
Country/TerritoryUnited States
CityPacific Grove
Period31/10/213/11/21

Publication forum classification

  • Publication forum level 1

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