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Digital Self-Interference Cancellation for Low-Cost Full-Duplex Radio Devices

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Full-Duplex Communications for Future Wireless Networks

Abstract

Wireless inband full-duplex communications, where individual radio devices transmit and receive simultaneously on the same frequency band, has recently been proposed as another step towards the full utilization of the available spectral resources. This chapter concentrates on solving the greatest challenge in wireless inband full-duplex communications, i.e., the self-interference, which refers to the interference produced by the own transmitter. To this end, this chapter provides digital-domain solutions for efficient self-interference cancellation in low-cost full-duplex radios. The proposed digital cancellers are capable of modeling the most prominent radio circuit impairments, in particular the nonlinear distortion produced by the transmitter power amplifier. The digital cancellers are evaluated using an actual inband full-duplex prototype, which contains also other self-interference suppression mechanisms operating in the analog domain. The obtained measurement results show that, with the help of these digital cancellers, the self-interference can be cancelled almost perfectly, proving that true full-duplex operation is indeed possible. Altogether, the own transmit signal is shown to be suppressed in some cases by more than 100 dB, which is one of the highest reported self-interference cancellation performances to date.

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Acknowledgements

We would like to acknowledge the financial support received from the Tampere University of Technology Graduate School, Nokia Foundation, Tuula and Yrjö Neuvo Research Fund, Emil Aaltonen Foundation, and Pekka Ahonen Fund. In addition, we also wish to acknowledge the funding received from Academy of Finland (under the projects #259915 “In-Band Full-Duplex MIMO Transmission: A Breakthrough to High-Speed Low-Latency Mobile Networks”, #301820 “Competitive Funding to Strengthen University Research Profiles”, and #304147 “In-Band Full-Duplex Radio Technology: Realizing Next Generation Wireless Transmission”), Finnish Funding Agency for Technology and Innovation (Tekes, under the projects “Full-Duplex Cognitive Radio” and “TAKE-5”), and Intel Corporation.

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  1. Nokia Bell Labs, Espoo, Finland

    Dani Korpi

  2. Unit of Electrical Engineering, Tampere University, Tampere, Finland

    Lauri Anttila, Taneli Riihonen & Mikko Valkama

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  1. Dani Korpi
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  2. Lauri Anttila
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  3. Taneli Riihonen
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  4. Mikko Valkama
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Correspondence to Dani Korpi .

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  1. Centre for Wireless Communications, University of Oulu, Oulu, Finland

    Hirley Alves

  2. Unit of Electrical Engineering, Tampere University, Tampere, Finland

    Taneli Riihonen

  3. Department of Electrical and Electronic Engineering, University of Peradeniya, Peradeniya, Sri Lanka

    Himal A. Suraweera

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Korpi, D., Anttila, L., Riihonen, T., Valkama, M. (2020). Digital Self-Interference Cancellation for Low-Cost Full-Duplex Radio Devices. In: Alves, H., Riihonen, T., Suraweera, H. (eds) Full-Duplex Communications for Future Wireless Networks. Springer, Singapore. https://doi.org/10.1007/978-981-15-2969-6_3

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