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• W2111417022 abstract "In this study, the authors consider the problem of distributed relay beamforming in an underlay-based cognitive relay network in which a secondary network transmits its data using multiple relays under an amplify-and-forward protocol simultaneously with a primary network over the same spectrum. For such a network, assuming that the partial channel state information (CSI) is available, the authors study two different beamforming approaches to improve performance of the secondary transmissions while ensuring the quality-of-service of the primary transmissions. In the first approach, the authors obtain the beamforming weights as well as the transmit power of the secondary source such that the signal-to-interference plus noise ratio (SINR) at the secondary destination is maximised whereas the interference power from the secondary to the primary network is kept below a predefined threshold. In the second approach, the beamforming weights are obtained through minimising the received interference power at the primary receiver subject to a constraint on SINR at the secondary destination. The authors prove that both proposed approaches result in closed-form solutions. Simulation results show that as the uncertainty in CSI decreases, the proposed schemes achieve better performances. In addition, increasing the number of relays improves the overall system performance." @default.
• W2111417022 created "2016-06-24" @default.
• W2111417022 creator A5000272138 @default.
• W2111417022 creator A5083429563 @default.
• W2111417022 date "2012-01-01" @default.
• W2111417022 modified "2023-10-16" @default.
• W2111417022 title "Distributed beamforming in cognitive relay networks with partial channel state information" @default.
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• W2111417022 doi "https://doi.org/10.1049/iet-com.2011.0652" @default.
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