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Digital Cancellation of Passive Intermodulation in FDD Transceivers

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Details

Original languageEnglish
Title of host publication2018 52nd Asilomar Conference on Signals, Systems, and Computers
PublisherIEEE
Pages1375-1381
Number of pages7
ISBN (Electronic)978-1-5386-9218-9
ISBN (Print)978-1-5386-9219-6
DOIs
Publication statusPublished - Oct 2018
Publication typeA4 Article in a conference publication
EventAsilomar Conference on Signals, Systems and Computers -
Duration: 1 Jan 1900 → …

Publication series

Name
ISSN (Print)1058-6393

Conference

ConferenceAsilomar Conference on Signals, Systems and Computers
Period1/01/00 → …

Abstract

Modern radio systems and transceivers utilize carrier aggregation (CA) to meet the demands for higher and higher data rates. However, the adoption of CA in the existing Long Term Evolution (LTE)-Advanced and emerging 5G New Radio (NR) mobile networks, in case of frequency division duplexing (FDD), may incur self-interference challenges with certain band combinations. More specifically, the nonlinear distortion products of the transmit signals or component carriers (CCs), stemming from the passive radio frequency (RF) front-end components of the transceiver, can appear in one or more of the configured receiver bands, potentially leading to the receiver desensitization. In this paper, we present advanced baseband equivalent signal models for such passive intermodulation (PIM) distortion viewed from the RX point of view, considering also potential memory effects in the PIM generation. Then, building on these signal models, a digital self-interference cancellation technique operating in the transceiver digital front-end is presented. The performance of the proposed solution is evaluated with real-life RF measurements for LTE-Advanced type user equipment (UE) with dual CC interband CA, demonstrating excellent suppression properties. The findings in this work indicate that digital cancellation is a feasible approach for improving the receiver sensitivity of mobile devices that may be prone to RF front-end induced PIM challenges.

Keywords

  • Radio frequency, Baseband, Transceivers, Nonlinear distortion, Receivers, Long Term Evolution, Interference cancellation, 4G LTE-Advanced, 5G NR, digital cancellation, frequency division duplexing, nonlinear distortion, passive intermodulation, self-interference

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