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Journal Article Self-interference cancellation for two-way amplify-and-forward relaying systems
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Authors
Joonwoo Shin, Bangwon Seo
Issue Date
2014-01
Citation
IET Communications, v.8, no.7, pp.1024-1031
ISSN
1751-8628
Publisher
IET
Language
English
Type
Journal Article
DOI
https://dx.doi.org/10.1049/iet-com.2013.0718
Project Code
14MI9100, Development of 5G Mobile Communication Technologies for Hyper-connected smart services, Chung Hyun Kyu
Abstract
This study proposes implementation of two-way amplify-and-forward relaying systems in practical environments where signals from two source nodes arrive at a relay with different propagation delays. The authors develop a selfinterference delay and channel estimation technique applicable for practical environments. Whereas receiver processing in conventional schemes is performed in the baud rate domain, in this work, oversampling (or Nyquist sampling) is introduced at the receiver to avoid any energy loss in the desired signal. They derive the proposed estimator in the oversampled domain on the basis of the least square criterion and also provide a design guide for the oversampling ratio and the application of a self-interference canceller. They observe from the author's analysis and simulation results that an oversampling of 2 is sufficient, and it is not preferable to use a self-interference canceller when L/(N쨌ISNR) is greater than 1, where the interference-to-signal-plus-noise ratio (ISNR) denotes the power ratio of the self-interference to the desired signal plus noise, L is the channel length and N is the number of symbols in one time slot. © The Institution of Engineering and Technology 2014.
KSP Keywords
Analysis and simulation, Baud rate, Channel Length, Channel estimation(CE), Estimation Technique, Least Squares(LS), Least square criterion, Nyquist sampling, Oversampling ratio, Propagation delay, Self-Interference Cancellation