Adaptive Nonlinear Digital Self-interference Cancellation for Mobile Inband Full-Duplex Radio: Algorithms and RF Measurement

Dani Korpi, Yang Seok Choi, Timo Huusari, Lauri Anttila, Shilpa Talwar, Mikko Valkama

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

    70 Citations (Scopus)


    This article investigates novel adaptive self-interference cancellation solutions and the total integrated cancellation performance of a mobile single-antenna inband full-duplex transceiver. First, novel self-adaptive digital self-interference cancellation algorithms are described, with an emphasis on tracking of time-varying self-interference coupling channel in a mobile device as well as on structural ability to suppress also nonlinear self-interference with highly nonlinear mobile power amplifiers. This leads to an advanced self-adaptive nonlinear digital canceller which utilizes a novel orthogonalization procedure for nonlinear basis functions, together with low-cost LMS-based parameter learning. The achievable self-interference cancellation performance is then evaluated with actual RF measurements using mobile device scale RF components, in particular a highly nonlinear PA. The measurements also incorporate a novel self-adaptive RF cancellation circuit in order to realistically assess the total integrated cancellation performance. The reported results show that highly efficient self-interference cancellation can be achieved also in a mobile device, despite a heavily nonlinear PA and limited computing and hardware resources. The proposed cancellation solutions, when integrated together, show that 100 dB of self-interference can be cancelled using a 20 MHz LTE waveform, while the SI can be attenuated by over 110 dB with a narrower bandwidth of 1.4 MHz, all measured at 2.4 GHz ISM band. Furthermore, these results are achieved using a highly nonlinear transmitter power amplifier and fully adaptive canceller structures which can track a rapidly changing coupling channel in a mobile full-duplex device.
    Original languageEnglish
    Title of host publicationProceedings of IEEE Global Communications Conference (IEEE GLOBECOM 2015)
    ISBN (Electronic)978-1-4799-5951-8
    Publication statusPublished - 2015
    Publication typeA4 Article in conference proceedings
    EventIEEE Global Communications Conference -
    Duration: 1 Jan 1900 → …


    ConferenceIEEE Global Communications Conference
    Period1/01/00 → …

    Publication forum classification

    • Publication forum level 1


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