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• W2964227746 abstract "We propose a cellular architecture that combines multiuser MIMO downlink with opportunistic use of unlicensed Industrial, Scientific, and Medical Radio (ISM) bands to establish device-to-device (D2D) cooperation. The architecture consists of a physical-layer cooperation scheme based on forming downlink virtual MIMO channels through D2D relaying, and a novel resource allocation strategy for such D2D-enabled networks. We prove the approximate optimality of the physical-layer scheme, and demonstrate that such cooperation boosts the effective $ mathsf {SNR}$ of the weakest user in the system, especially in the many-user regime, due to multiuser diversity. To harness this physical-layer scheme, we formulate the cooperative user scheduling and the relay selection problem using the network utility maximization framework. For such a cooperative network, we propose a novel utility metric that jointly captures fairness in throughput and the cost of relaying in the system. We propose a joint user scheduling and relay selection algorithm, which we prove to be asymptotically optimal. We study the architecture through system-level simulations over a wide range of scenarios. The highlight of these simulations is an approximately $6x$ improvement in data rate for cell-edge (bottom fifth-percentile) users (over the state-of-the-art) while still improving the overall throughput, and considering various system constraints." @default.
• W2964227746 created "2019-07-30" @default.
• W2964227746 creator A5074879219 @default.
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• W2964227746 date "2017-09-01" @default.
• W2964227746 modified "2023-10-17" @default.
• W2964227746 title "Enhancing Multiuser MIMO Through Opportunistic D2D Cooperation" @default.
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• W2964227746 doi "https://doi.org/10.1109/twc.2017.2712649" @default.
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