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• W2247238029 abstract "Power and on–off control problems are examined for renewable energy enabled base-stations (BSs) and relay nodes (RNs) in cooperative multicast networks. Renewable energy is utilized at BSs and RNs to reduce the overall grid energy cost. By considering a practical energy consumption model and the statistics of the renewable energy arrival, the optimal transmit powers are first determined by minimizing the expected grid energy consumption subject to an average outage probability constraint at MUs. The optimal solution is found via line search in the general case and is obtained in closed-form at high SNR. In addition, an on–off control policy is also proposed to further reduce the basic operational energy costs. The joint on–off and power control problems are solved approximately using two sequential deflation techniques, namely, the subset-search and the convex-relaxation-based approaches. The power control problem is also extended to the multicarrier scenario with unequal transmit powers and is solved using successive convex approximation. Simulations using the photovoltaic energy arrival model are provided to demonstrate the effectiveness of the proposed schemes. The results show that expending more power at RNs allows for more efficient use of renewable energy and, thus, increases energy-savings." @default.
• W2247238029 created "2016-06-24" @default.
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• W2247238029 date "2016-01-01" @default.
• W2247238029 modified "2023-10-17" @default.
• W2247238029 title "Cooperative Multicasting in Renewable Energy Enhanced Relay Networks—Expending More Power to Save Energy" @default.
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• W2247238029 doi "https://doi.org/10.1109/twc.2015.2477903" @default.
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