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Beamforming for underlay two-way relay networks Open Access


Other title
Two-Way Relay
Underlay Cognitive Radio
Type of item
Degree grantor
University of Alberta
Author or creator
CAO, Yun
Supervisor and department
Tellambura, Chintha (Electrical and Computer Engineering)
Examining committee member and department
Jing, Yindi (Electrical and Computer Engineering)
Elmallah, Ehab (Computing Science)
Jiang, Hai (Electrical and Computer Engineering)
Yang, Hong-Chuan (Electrical and Computer Engineering, University of Victoria)
Department of Electrical and Computer Engineering
Date accepted
Graduation date
Doctor of Philosophy
Degree level
Although underlay networks mitigate the dual problems of spectrum congestion and spectrum under-utilization, the bi-directional (primary-to-secondary and secondary-to-primary) interference issues must be addressed to improve their reliability, coverage and capacity. To address these problems, this thesis investigates beamforming and two-way relaying. Specifically, the two underlay configurations considered are (a) multi-antenna terminals and one single-antenna two-way relay and (b) single-antenna terminals and multiple single-antenna two-way relays. First, for Configuration (a), assuming the availability of perfect channel state information, the performance of sub-optimal beamforming algorithms is characterized. Specifically, the exact and asymptotic outage probabilities in high transmit power and interference temperature limit region are derived considering both path loss effect and small-scale fading. Second, also for Configuration (a), efficient transmitter and receiver beamforming strategies are developed, e.g., transmit powers, transmitter-side beamforming and receiver-side beamforming vectors at the two multi-antenna terminals. Third, for Configuration (b), assuming the availability of second-order channel statistics, the joint relaying and transmitter designs are developed. Overall, these research findings show the capability of beamforming and relaying in addressing the bi-directional interferences problems in underlay networks and thus improving their reliability.
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.
Citation for previous publication
Y. CAO and C. Tellambura, "Joint Distributed Beamforming and Power Allocation in Underlay Cognitive Two-Way Relay Links Using Second-Order Channel Statistics," IEEE Transactions on Signal Processing, vol. 62, no. 22, November 2014, P5950-5961Y. CAO and C. Tellambura, "Distributed beamforming and power allocation in two-way multi-relay networks with second-order channel statistics," 2013 International Conference in Wireless Communications and Signal Processing (WCSP), October 2013, Hangzhou, ChinaY. CAO and C. Tellambura, "Outage Analysis of ZFB-MRT/MRC underlay Two-way Relay Systems," IEEE Communication Letter, March 2015, Accepted for Publication

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File title: Beamforming for Underlay Two-Way Relay Networks
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