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In this paper, we consider a cognitive radio (CR) system, where a secondary network shares spectrum with a primary network. In the secondary network, a relay station (RS) with multiple antennas performs two-way communications for multiple pairs of secondary users (SUs). In such a CR system, the main point is to provide the best system performance to SUs while protecting primary users (PUs) from excess...
We deal with linear precoding in two-hop multiple-input single-output (MISO) amplify-and-forword (AF) cooperative networks. It is assumed that only limited feedback about channel state information (CSI) is available at the source node where precoding is performed. To reduce the feedback overhead, the precoder is designed based on covariance CSI of the direct channel and relay channel with the constraint...
In this paper, we investigate the system performance of a downlink transmission with fixed relay, where the signals at transmit and relay nodes are pre-processed by linear precoders designed based only on partial channel state information (CSI) obtained from the limited feedback channel. Precoders are designed to minimize the mean square error of the transmit signal under the constraint of total transmit...
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