1st International Conference on 5G for Ubiquitous Connectivity

Research Article

A Full-Duplex Transceiver Prototype with In-System Automated Tuning of the RF Self-Interference Cancellation

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  • @INPROCEEDINGS{10.4108/icst.5gu.2014.258118,
        author={Mina Mikhael and Barend van Liempd and Jan Craninckx and Rafik Guindi and Bjorn Debaillie},
        title={A Full-Duplex Transceiver Prototype with In-System Automated Tuning of the RF Self-Interference Cancellation},
        proceedings={1st International Conference on 5G for Ubiquitous Connectivity},
        publisher={IEEE},
        proceedings_a={5GU},
        year={2014},
        month={12},
        keywords={in-band full duplex self-interference cancellation automated tuning transceiver prototype},
        doi={10.4108/icst.5gu.2014.258118}
    }
    
  • Mina Mikhael
    Barend van Liempd
    Jan Craninckx
    Rafik Guindi
    Bjorn Debaillie
    Year: 2014
    A Full-Duplex Transceiver Prototype with In-System Automated Tuning of the RF Self-Interference Cancellation
    5GU
    IEEE
    DOI: 10.4108/icst.5gu.2014.258118
Mina Mikhael1,*, Barend van Liempd2, Jan Craninckx2, Rafik Guindi1, Bjorn Debaillie2
  • 1: Nile University
  • 2: Imec
*Contact email: minamitry@gmail.com

Abstract

This paper presents a transceiver prototype capable of in-band full duplex communication. Apart from a conventional transceiver and antenna, this prototype relies on a tunable electrical balance duplexer to minimize the in-band self-interference at RF. Such duplexer however requires continuous-time tuning to ensure accurate impedance balancing with the antenna across different environmental conditions. An automatic tuning algorithm is presented which tracks antenna impedance variations and tunes the duplexer accordingly. This tuning operates on a standard compliant training sequence to minimize the overhead on the communication system. The implemented tuning mechanism does not require any additional RF or analog hardware, and maximally re-uses the digital resources of a conventional baseband processor. The full duplex prototype was validated in a wireless link for IEEE802.11 channels in the 2.4GHz ISM band, in which the error vector magnitude improves by 15dB as the RF self-interference cancellation increased from 25dB to 45dB.