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Electronics and Telecommunications Research Institute (한국전자통신연구원)
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Novel Digital Cancelation Method in Presence of Harmonic Self-Interference

  • Ju, Hyungsik (5G Giga Communication Research Laboratory, ETRI) ;
  • Gwak, Donghyuk (5G Giga Communication Research Laboratory, ETRI) ;
  • Lee, Yuro (5G Giga Communication Research Laboratory, ETRI) ;
  • Kim, Tae-Joong (5G Giga Communication Research Laboratory, ETRI)
  • Received : 2016.07.20
  • Accepted : 2017.02.02
  • Published : 2017.04.01
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Abstract

In-band full-duplex (IFD) communication has recently attracted a great deal of interest because it potentially provides a two-fold spectral efficiency increase over half-duplex communications. In this paper, we propose a novel digital self-interference cancelation (DSIC) algorithm for an IFD communication system in which two nodes exchange orthogonal frequency-division multiplexing (OFDM) symbols. The proposed DSIC algorithm is based on the least-squares estimation of a self-interference (SI) channel with block processing of multiple OFDM symbols, in order to eliminate the fundamental and harmonic components of SI induced through the practical radio frequency devices of an IFD transceiver. In addition, the proposed DSIC algorithm adopts discrete Fourier transform processing of the estimated SI channel to further enhance its cancelation performance. We provide a minimum number of training symbols to estimate the SI channel effectively. The evaluation results show that our proposed DSIC algorithm outperforms a conventional algorithm.

Keywords

Acknowledgement

Grant : Development of 5G Mobile Communication Technologies for Hyper-Connected Smart Services

Supported by : Information and Communications Technology Promotion (IITP)

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