@article{7942013,
 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 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 6× 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.},
 author = {C. {Karakus} and S. {Diggavi}},
 doi = {10.1109/TWC.2017.2712649},
 issn = {1558-2248},
 journal = {IEEE Transactions on Wireless Communications},
 keywords = {cellular radio;cooperative communication;MIMO communication;multiuser channels;relay networks (telecommunication);resource allocation;telecommunication scheduling;cellular architecture;multiuser MIMO downlink;unlicensed Industrial Scientific and Medical Radio bands;unlicensed ISM bands;device-to-device cooperation;D2D cooperation;physical-layer cooperation scheme;downlink virtual MIMO channels;D2D relaying;resource allocation strategy;D2D-enabled networks;physical-layer scheme;many-user regime;multiuser diversity;cooperative user scheduling;network utility maximization framework;joint user scheduling algorithm;relay selection algorithm;system-level simulations;cell-edge users;Device-to-device communication;Downlink;Computer architecture;Throughput;MIMO;Relays;Base stations;D2D;opportunistic scheduling;multiuser MIMO;ISM bands;user cooperation},
 month = {Sep.},
 number = {9},
 pages = {5616-5629},
 tags = {journal,WiNetnew,WiNet},
 title = {Enhancing Multiuser MIMO Through Opportunistic D2D Cooperation},
 type = {2},
 volume = {16},
 year = {2017}
}

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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 6× 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.","author":[{"firstnames":["C."],"propositions":[],"lastnames":["Karakus"],"suffixes":[]},{"firstnames":["S."],"propositions":[],"lastnames":["Diggavi"],"suffixes":[]}],"doi":"10.1109/TWC.2017.2712649","issn":"1558-2248","journal":"IEEE Transactions on Wireless Communications","keywords":"cellular radio;cooperative communication;MIMO communication;multiuser channels;relay networks (telecommunication);resource allocation;telecommunication scheduling;cellular architecture;multiuser MIMO downlink;unlicensed Industrial Scientific and Medical Radio bands;unlicensed ISM bands;device-to-device cooperation;D2D cooperation;physical-layer cooperation scheme;downlink virtual MIMO channels;D2D relaying;resource allocation strategy;D2D-enabled networks;physical-layer scheme;many-user regime;multiuser diversity;cooperative user scheduling;network utility maximization framework;joint user scheduling algorithm;relay selection algorithm;system-level simulations;cell-edge users;Device-to-device communication;Downlink;Computer architecture;Throughput;MIMO;Relays;Base stations;D2D;opportunistic scheduling;multiuser MIMO;ISM bands;user cooperation","month":"Sep.","number":"9","pages":"5616-5629","tags":"journal,WiNetnew,WiNet","title":"Enhancing Multiuser MIMO Through Opportunistic D2D Cooperation","volume":"16","year":"2017","bibtex":"@article{7942013,\n 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 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. 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