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    National Tsing Hua University Institutional Repository > 歷任校長 > 陳文村 (2006-2010)  > 會議論文 >  Downlink Multiuser Beamforming and Power Control for Base Stations Empowered by Renewable Energy

    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/81584

    Title: Downlink Multiuser Beamforming and Power Control for Base Stations Empowered by Renewable Energy
    Authors: Yung-Shun Wang;Yao-Win Peter Hong;W. T. Chen
    教師: 陳文村
    Date: 2013
    Publisher: Institute of Electrical and Electronics Engineers
    Relation: Proceedings of 24th Annual IEEE International Symposium on Personal, Indoor, Mobile Radio Communications (PIMRC 2013), Institute of Electrical and Electronics Engineers, London, United Kingdom, 8-11 September 2013.
    Keywords: Array signal processing
    Power control
    Renewable energy sources
    Wireless communication
    Abstract: This work examines offline and online power control policies for efficient usage of renewable energy in the downlink of a multi-antenna wireless system. Two multiuser beamforming schemes are considered, namely, channel inversion (CI) and maximal ratio transmit (MRT) beamforming schemes. Power control policies are derived for both schemes, respectively, with the goal of maximizing the sum throughput by a deadline subject to energy causality and battery storage constraints. With CI beamforming, the power control problem can be formulated as a convex optimization problem, whose solution can be obtained using the directional water-filling algorithm. With MRT beam-forming, the power control problem becomes non-convex, due to interference between the signals intended for different users, and, thus, is difficult to solve exactly. However, an efficient solution can be obtained by performing successive approximation into a sequence of geometric programming problems, i.e., by employing the condensation method. Offline power control policies are first derived assuming non-causal knowledge of the energy arrival and channel coefficients over time. Online power control policies are then proposed based on observations gained from the offline policy. The performance of the proposed schemes are demonstrated through numerical simulations.
    Relation Link: http://www.ieee.org/index.html
    URI: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/81584
    Appears in Collections:[陳文村 (2006-2010) ] 會議論文
    [資訊工程學系] 會議論文

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