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Providing proper economic incentives is essential for the success of dynamic spectrum sharing. Cooperative spectrum sharing is one effective way to achieve this goal. In cooperative spectrum sharing, Secondary Users (SUs) relay traffics for Primary Users (PUs), in exchange for dedicated transmission time for the SUs' own communication needs. In this paper, the authors study the cooperative spectrum sharing under incomplete information, where SUs' types (which capture the relay channel gains and the SUs' power costs) are private information and are not known to the PU. Inspired by the contract theory, they model the network as a labor market. The PU is an employer who offers a contract to the SUs.
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