End-to-End HARQ in Cognitive Radio Networks

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Cognitive Radio Networks (CRN) may greatly enhance the throughput based on a given bandwidth. CRN has a unique feature, consisting of unidirectional opportunistic wireless links, and packets may be cooperatively relayed from source node to destination node through one or multiple paths, while each path consists of multi-hop opportunistic wireless fading links. Effective end-to-end error control is therefore a must to complete transportation of packets in CRN, though not being touched in open literatures. Traditional ARQ cannot generally function over uni-directional opportunistic links. The authors consequently develop a novel hybrid ARQ based on amplify-and-forward cooperative relay of CRN to reach the purpose of end-to-end error control at session level.