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In this paper, we consider a pair of cognitive radio (CR) users co-existing with a pair of ARQ- based primary users (PU). The secondary user (SU) overhears the ACK/NACK feedback sent from the receiver of the primary system, and then decides to access the spectrum or not. An opportunistic sharing scheme, referred to as Spectrum sHaring with ARQ Retransmission and Probing timeslots (SHARP), is proposed...
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