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Permanent link (DOI): https://doi.org/10.7939/R3N01023G

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Partial Zero Forcing for Multi-Way Relay Networks Open Access

Descriptions

Other title
Subject/Keyword
interference cancellation
zero-forcing
multi-way relay networks
beamforming
sum-rate maximization
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Zhang, Wuhua
Supervisor and department
Ardakani, Masoud (Electrical and Computer Engineering)
Jing, Yindi (Electrical and Computer Engineering)
Examining committee member and department
Khabbazian, Majid (Electrical and Computer Engineering)
Jiang, Hai (Electrical and Computer Engineering)
Jing, Yindi (Electrical and Computer Engineering)
Ardakani, Masoud (Electrical and Computer Engineering)
Department
Department of Electrical and Computer Engineering
Specialization
Communications
Date accepted
2015-09-21T14:47:20Z
Graduation date
2015-11
Degree
Master of Science
Degree level
Master's
Abstract
The ever increasing demands for mobile network access have resulted a significant growth in bandwidth usage. By improving the system spectral efficiency, multi-way relay networks (MWRNs) provide promising approaches to address this challenge. In this thesis, we propose a novel linear beamforming design, namely partial zero-forcing (PZF), for MWRNs with a multiple-input-multiple-output (MIMO) relay. Compared to zero-forcing (ZF), PZF relaxes the constraints on the relay beamforming matrix such that only partial user-interference, instead of all, is canceled at the relay. The users eliminate the remaining interferences through self-interference and successive interference cancellation. A sum-rate maximization problem is formulated to exploits the extra degrees-of-freedom brought from PZF. In solving the optimization problem, a numerical method, called modified gradient-ascent method, is proposed. Simulation results show that the proposed PZF relay beamforming design achieves significantly higher network sum rates than existing linear beamforming designs.
Language
English
DOI
doi:10.7939/R3N01023G
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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