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Coverage and Throughput Enhancement in MIMO Cellular Networks via Cooperative Relaying Open Access


Other title
User scheduling
Sum rate maximization
Relay selection
Type of item
Degree grantor
University of Alberta
Author or creator
Okeke, Obumneme Godfrey
Supervisor and department
Jing, Yindi (Electrical and Computer Engineering)
Krzymien, Witold A. (Electrical and Computer Engineering)
Examining committee member and department
Krzymien, Witold (Electrical and Computer Engineering)
Wang, Xianbin (University of Western Ontario)
Jing, Yindi (Electrical and Computer Engineering)
Tellambura, Chintha (Electrical and Computer Engineering)
Jiang, Hai (Electrical and Computer Engineering)
Department of Electrical and Computer Engineering
Date accepted
Graduation date
Doctor of Philosophy
Degree level
One of the major challenges of broadband cellular systems is delivering high data rates to the users, especially those at the cell edges. In this thesis, transceiver designs and scheduling algorithms for enhancing cell-edge user experience in emerging and future broadband wireless cellular networks are investigated. In particular, the use of fixed infrastructure-based non-regenerative and altruistic (i.e., not having their own data to transmit) relays for coverage extension (at high data rates) in cellular networks with multiple antenna transmitters and receivers is considered. In order to mitigate the high interference jeopardizing the high data rate promise of MIMO spatial multiplexing in cellular networks, CoMP transmission/reception is employed. Leveraging MIMO, CoMP and relay techniques in a unified manner, we jointly design the input covariance and relay beamforming matrices to maximize the system data rate. For the single-cell MIMO downlink, uplink-downlink duality is first proved and then employed to design the downlink parameters from more tractable uplink channel. For the multi-cell MIMO network, interference mitigation is incorporated into the relay designs in order to decouple the correlated relay transmissions due to interference from unintended sources. Furthermore, we propose novel low complexity joint user-relay selection/scheduling and/or association strategies to further improve the system performance, which lead to low complexity and overhead. Simulation results demonstrate the effectiveness of the proposed schemes. The favorable performance and low complexity of the proposed schemes make them very attractive for possible implementation in emerging and future broadband wireless 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
G. O. Okeke, Y. Jing, and W. A. Krzymien, ``Beamforming in MIMO broadcast relay networks with multiple antenna users,'' in Proc. 45th Asilomar Conf. on Signals, Systems and Computers (ACSSC)- Invited Paper, Pacific Grove, CA, USA, November 2011, pp. 1222-1226.G. Okeke, W. A. Krzymien, and Y. Jing, ``Beamforming in non-regenerative MIMO broadcast relay networks,'' IEEE Trans. Signal Processing, vol. 60, no. 12, pp. 6641-6654, December 2012.G. O. Okeke, W. A. Krzymien and Y. Jing, ``Distributed beamforming in multi-cell cooperative MIMO cellular networks with non-regenerative relays: An LTE-advanced framework,'' in Proc. IEEE Global Communications Conference (GLOBECOM), Atlanta, GA, USA, December 2013, pp. 4240-4245.G. O. Okeke, W. A. Krzymien, Y. Jing, and J. Melzer, ``A novel low-complexity joint user-relay selection and association for multi-user multi-relay MIMO uplink,'' accepted for publication in IEEE Wireless Commun. Lett., February 2015.G. O. Okeke, Y. Jing, W. A. Krzymien, and J. Melzer, ``Interference mitigation and user-relay association in multi-cell cooperative MIMO cellular uplink with non-regenerative relaying: An LTE-Advanced framework,'' submitted to IEEE Trans. Veh. Technol., July 2014.

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