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Performance Evaluation and Spectral Efficiency Improvements for Wireless Networks With Interference Open Access


Other title
Interference coordination
Relay Networks
Type of item
Degree grantor
University of Alberta
Author or creator
Hemachandra, Kasun T
Supervisor and department
Tsui, Ying Y (Electrical and Computer Enginering)
Examining committee member and department
Dobre, Octavia (External Examiner- Memorial University, NL)
Krzymien, Witold (Electrical and Computer Enginering)
Tellambura, Chintha (Electrical and Computer Enginering)
Ardakani, Masoud (Electrical and Computer Enginering)
Schmuland, Byron (Mathematics and Statistics)
Department of Electrical and Computer Engineering
Date accepted
Graduation date
Doctor of Philosophy
Degree level
The demand for high data rate wireless services has grown tremendously. The demand is expected to grow further at an increased pace. The scarcity of the usable radio frequency spectrum is a major bottleneck to cater to the growing demand for high data rate wireless services. Current cellular wireless networks rely on deploying small cells as a possible solution to cater to the growing demand. However, this practice has resulted in severe co-channel interference (CCI) levels in cellular networks. The first phase of this thesis investigates the impact of CCI on relay networks and distributed antenna systems, which are included in recent wireless standards such as long-term evolution advanced (LTE-A). The analytical results derived for system performance metrics, such as the outage probability and the ergodic rate, are used to obtain valuable insights for system design. The second stage of this thesis research proposes interference reduction schemes for wireless relay networks operating in the presence of CCI and analytically investigates the performance of each scheme. The analytical results are used to obtain crucial design insights such as the feedback rate and position of the relay nodes. Another approach to compensate for the spectrum scarcity is through improving the spectral efficiency (SE) of the wireless networks. As a step towards increasing SE, recently, there has been research efforts to implement full-duplex (FD) wireless communications. The main challenge in FD is the interference on the reception by its own transmission. Recent advances in self-interference reduction schemes have made FD communications feasible for short range communications. This thesis develops a theoretical framework to study the average data rate of FD communications for short range communications using device-to-device networks.
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
K. T. Hemachandra and N. C. Beaulieu, “Outage analysis of opportunistic scheduling in dual-hop multiuser relay networks in the presence of interference,” IEEE Trans. Commun., vol. 61, no. 5, pp. 1786–1796, May 2013.K. T. Hemachandra and N. C. Beaulieu, “A moment matching technique to estimate the achievable ergodic rate for limited feedback distributed antenna systems in the presence of out-of-cell interference,” IEEE Commun. Lett., vol. 17, no. 7, pp. 1360–1363, July 2013.K. T. Hemachandra and N. C. Beaulieu, “Relay coordination schemes for two-hop networks: Two-cell case,” IEEE Trans. Commun., vol. 63, no. 4, pp. 1178– 1190, Apr. 2015K. T. Hemachandra and N. C. Beaulieu, “Shared relay networks with linear receivers at the relay: Two-cell case,” IEEE Trans. Commun., vol. 62, no. 4, pp. 1230–1239, Apr. 2014.K. T. Hemachandra, N. Rajatheva, and M. Latva-aho, “Sum-rate analysis for full-duplex underlay device-to-device networks,” in Proc. IEEE Wireless Commun. and Networking Conf. (WCNC), Apr. 2014, pp. 514–519.

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