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Cognitive radio is a promising paradigm to achieve efficient utilization of spectrum resource by allowing the unlicensed users (i.e., secondary users, SUs) to access the licensed spectrum. Market-driven spectrum trading is an efficient way to achieve dynamic spectrum accessing/sharing. In this paper, the authors consider the problem of spectrum trading with single primary spectrum owner (or primary user, PO) selling his idle spectrum to multiple SUs. They model the trading process as a monopoly market, in which the PO acts as monopolist who sets the qualities and prices for the spectrum he sells and the SUs act as consumers who choose the spectrum with appropriate quality and price for purchasing.
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