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In this paper, the authors propose a Quality-of-Service (QoS) constrained power and rate allocation scheme for spectrum sharing systems. In particular, they assume existence of secondary users, who are allowed to access the spectrum occupied by a primary user subject to satisfying interference-power limitations. Specifically, they assume that the successful operation of the primary user requires a minimum-rate to be supported by its channel for a certain percentage of time, and obtain an average interference-power constraint that is required to be fulfilled by the secondary user.
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