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Modeling and cancellation of self-interference in full-duplex radio transceivers: Volterra series-based approach

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

Details

Original languageEnglish
Title of host publication2018 IEEE International Conference on Communications Workshops
PublisherIEEE
Pages1-6
Number of pages6
ISBN (Electronic)9781538643280
DOIs
Publication statusPublished - 3 Jul 2018
Publication typeA4 Article in a conference publication
EventIEEE International Conference on Communications Workshops -
Duration: 1 Jan 1900 → …

Conference

ConferenceIEEE International Conference on Communications Workshops
Period1/01/00 → …

Abstract

This paper presents a novel digital self-interference canceller for inband full-duplex radio transceivers. The proposed digital canceller utilizes a Volterra series with sparse memory to model the residual SI signal, and it can thereby accurately reconstruct the self-interference even under a heavily nonlinear transmitter power amplifier. To the best of our knowledge, this is the first time such a sparse-memory Volterra series has been used to model the self-interference within an inband full-duplex device. The performance of the Volterra-based canceller is evaluated with real-life measurements that incorporate also an active analog canceller. The results show that the novel digital canceller suppresses the SI by 34 dB in the digital domain, outperforming the state- of-the-art memory polynomial-based solution by a margin of 5 dB. The total amount of cancellation is nearly 110 dB with a transmit power of +30 dBm, even though a shared transmit/receive antenna is used. To the best of our knowledge, this is the highest reported cancellation performance for a shared-antenna full-duplex device with such a high transmit power level.

Keywords

  • Digital cancellation, Full-duplex, Nonlinear power amplifier, Self-interference, Volterra series

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