Novel Digital Cancelation Method in Presence of Harmonic Self-Interference
- Resource Type
- Article
- Authors
- 주형식; 곽동혁; 이유로; 김태중
- Source
- ETRI Journal, 39(2), pp.245-254 Apr, 2017
- Subject
- 전자/정보통신공학
- Language
- English
- ISSN
- 2233-7326
1225-6463
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.