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The spectrum sensing problem is one of the most challenging issues in cognitive radio networks. In this letter, a novel spectrum sensing scheme named segmental energy detection (SED) is presented. For the proposed scheme, energy detection will carry out segmentally and finish when reach the predetermined performance. We further derive the largest required observations, average sample number and implementation...
In this letter, we propose two relay selection schemes in cognitive relay networks. According to the proposed schemes, the number of relays involved in the opportunistic relaying is determined by the partial channel state information (CSI) of primary user link and partial CSI between the relays and the primary user receiver, so as to maintain the primary user's outage probability below a predetermined...
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