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The cognitive radio (CR) systems usually arrange for the quiet period to detect the primary user (PU) effectively. Since all CR users do not transmit any data during quiet period, the interference caused by other CR users can be prevented in the channel sensing for PU detection. Even though the quiet period improves the PU detection performance, it degrades(More)
Relay-assisted communication can improve the quality of service (QoS) of users located at the cell boundary or the shadowed area. In this paper, we investigate the efficient resource allocation scheme for the orthogonal frequency division multiple access (OFDMA) based relaying systems. To maximize system performance, the proposed scheme exploits the spatial(More)
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