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Coverage and Throughput Enhancement in MIMO Cellular Networks via Cooperative Relaying

  • Author / Creator
    Okeke, Obumneme Godfrey
  • 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.

  • Subjects / Keywords
  • Graduation date
    2015-11
  • Type of Item
    Thesis
  • Degree
    Doctor of Philosophy
  • DOI
    https://doi.org/10.7939/R3DV1CT59
  • License
    This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
  • Language
    English
  • Institution
    University of Alberta
  • Degree level
    Doctoral
  • Department
    • Department of Electrical and Computer Engineering
  • Specialization
    • Communications
  • Supervisor / co-supervisor and their department(s)
    • Krzymien, Witold A. (Electrical and Computer Engineering)
    • Jing, Yindi (Electrical and Computer Engineering)
  • Examining committee members and their departments
    • Jing, Yindi (Electrical and Computer Engineering)
    • Tellambura, Chintha (Electrical and Computer Engineering)
    • Krzymien, Witold (Electrical and Computer Engineering)
    • Wang, Xianbin (University of Western Ontario)
    • Jiang, Hai (Electrical and Computer Engineering)