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• W2159081591 abstract "Secondary spectrum usage has the potential to considerably increase spectrum utilization. In this paper, quality-of-service (QoS)-aware spectrum underlay of a secondary multicast network is considered. A multiantenna secondary access point (AP) is used for multicast (common information) transmission to a number of secondary single-antenna receivers. The idea is that beamforming can be used to steer power towards the secondary receivers while limiting sidelobes that cause interference to primary receivers. Various optimal formulations of beamforming are proposed, motivated by different ldquocohabitationrdquo scenarios, including robust designs that are applicable with inaccurate or limited channel state information at the secondary AP. These formulations are NP-hard computational problems; yet it is shown how convex approximation-based multicast beamforming tools (originally developed without regard to primary interference constraints) can be adapted to work in a spectrum underlay context. Extensive simulation results demonstrate the effectiveness of the proposed approaches and provide insights on the tradeoffs between different design criteria." @default.
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• W2159081591 date "2009-06-01" @default.
• W2159081591 modified "2023-09-30" @default.
• W2159081591 title "Spectrum Sharing in Wireless Networks via QoS-Aware Secondary Multicast Beamforming" @default.
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• W2159081591 doi "https://doi.org/10.1109/tsp.2009.2016262" @default.
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