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A cognitive device-to-device (D2D) network with D2D transmitters (DTs) that harvest radio-frequency energy from the primary transmitters (PTs) is investigated. A novel D2D transmitter-assisted cooperative (DTAC) protocol is proposed, in which a group of DTs that have no transmission opportunity act as potential relays to improve the communications of the primary network. The outage probability of...
Channel state information is very important in cooperative communication for performance improvement or signal demodulation. Previous works on channel state information estimation mainly focus on least squares and minimum mean squared error estimators. In this work, several new maximum likelihood and maximum a posteriori estimators for the cooperative network are proposed. Two of them estimate the...
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