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Spectrum-sharing, aims to improve spectrum efficiency by allowing unlicensed (secondary) users to access the spectrum of licensed (primary) users, if the interference caused on the primary is tolerable. Thus, in order for the secondary to share the spectrum, it must effectively manage (reduce) interference on the primary. Multi-hop relaying and cooperative communication is known to significantly mitigate interference and increase the sum-throughput in many multiuser scenarios. This has motivated the use of relays in spectrum sharing networks.
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