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Relay-assisted Automatic Repeat reQuest (ARQ), which allows the relays instead of the source to carry out retransmissions of packets erroneously received at the destination, is an efficient cooperative transmission technique to improve link reliability with high spectrum efficiency in wireless networks. In Cognitive Radio (CR) systems, however, this relay-assisted ARQ could induce large latency, since a successful transmission of a packet may consume two idle time slot or temporal spectrum holes. To overcome this limitation, an active Interference Cancellation (IC)-aided distributed relay-assisted ARQ method is proposed in this paper to serve heterogeneous elastic traffics with diverse Quality of Service (QoS) demands in CR systems.
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