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In this paper, we study resource scheduling in a relay-assisted cognitive radio network with the orthogonal frequency division multiple access (OFDMA) scheme adopted to cope with the multi-user configuration. We discuss the optimization over the relay assignment, subcarrier allocation, per-node power control, and heterogenous quality-of-service (QoS) provisioning. The discrete characters of relay...
In this paper, we consider the problem of precoding design for amplify-and-forward (AF) relay network with imperfect channel state information (CSI). We find a general rank precoding matrix at the relay such that the relay transmit power is minimized subject to quality of service (QoS) constraint as the worst case signal-to-noise ratio (SNR) at the destination. Since the direct optimization is nonconvex,...
In this paper, we design the optimal precoding matrices for amplify-and-forward (AF) multiple-input multiple-output (MIMO) relay networks. Specifically, we consider a dual-hop relay network and minimize the total power consumed by source and relay under predetermined quality of service (QoS) constraints, i.e., mean square error (MSE) constraints. By using majorization theory, we simplify the matrix-valued...
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