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This paper considers a secondary user (SU) sharing the spectrum licensed to a primary user (PU) if limited interference caused to the latter can be guaranteed. In particular, besides the interference power constraint at the PU to protect the PU, the transmit power of the SU is also considered. Under such a setup, we consider the average bit error rate (BER) as the performance metric for the SU, and...
In this paper, Network Coding (NC) Theory is introduced to improve efficiency of the traditional ARQ scheme for Cognitive Radio (CR) broadcast, named as NC-ARQ, in which we consider making the CR basestation combine the lost packets during ARQ broadcast retransmission in CR networks (CRN), with the changeable availability of CR channel. The Broadcast Cost is defined to indicate and compare the theoretic...
Spectrum sensing is the key functionality of cognitive radio. To combat with the effects of destructive channels, cooperative spectrum sensing technique among multiple secondary users has been proposed in cognitive radio networks. In this paper, we present an optimal cooperative spectrum sensing strategy to maximize the sensing efficiency, which not only concerns with the system overhead of spectrum...
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