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In this paper, we examine the operation of a node relaying packets from a number of users to a destination node. We assume that the relay does not have packets of its own, the traffic from the users is saturated and we have random access of the medium with slotted time. We study the impact of the relay node on the throughput per user and the aggregate throughput for the group of users. We obtain analytical...
Recently, cognitive cooperation has received a great deal of attention, where the cognitive relay utilizes the periods of source silence to enable cooperation without consuming extra network resources. In this paper, we investigate more enhanced cooperative techniques on top of the existing network-layer conventional cognitive cooperation by exploiting more degrees of freedom at the physical layer...
In this paper, a novel cognitive multiple-access strategy in the presence of a cooperating relay is proposed. Exploiting an important phenomenon in wireless networks, source burstiness, the cognitive relay utilizes the periods of silence of the terminals to enable cooperation. Therefore, no extra channel resources are allocated for cooperation and the system encounters no bandwidth losses. Two protocols...
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