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Wideband self-adaptive RF cancellation circuit for full-duplex radio: Operating principle and measurements

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


Original languageEnglish
Title of host publication2015 IEEE 81st Vehicular Technology Conference (VTC Spring)
PublisherThe Institute of Electrical and Electronics Engineers, Inc.
ISBN (Print)9781479980888
Publication statusPublished - 1 Jul 2015
Publication typeA4 Article in a conference publication
EventIEEE Vehicular Technology Conference -
Duration: 1 Jan 1900 → …


ConferenceIEEE Vehicular Technology Conference
Period1/01/00 → …


This paper presents a novel RF circuit architecture for self-interference cancellation in inband full-duplex radio transceivers. The developed canceller is able to provide wideband cancellation with waveform bandwidths in the order of 100 MHz or beyond and contains also self-adaptive or self-healing features enabling automatic tracking of time-varying self-interference channel characteristics. In addition to architecture and operating principle descriptions, we also provide actual RF measurements at 2.4 GHz ISM band demonstrating the achievable cancellation levels with different bandwidths and when operating in different antenna configurations and under low-cost highly nonlinear power amplifier. In a very challenging example with a 100 MHz waveform bandwidth, around 41 dB total cancellation is obtained while the corresponding cancellation figure is close to 60 dB with the more conventional 20 MHz carrier bandwidth. Also, efficient tracking in time-varying reflection scenarios is demonstrated.


  • Full-duplex, RF cancellation, Self adaptive, Self interference, Tracking

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