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We study the quality-of-service (QoS) feasible region of a multiuser system, under the assumption that the QoS is a bijective function of the signal-to-interference ratio (SIR). The inverse function is assumed to be log-convex (e.g. log-SIR). We derive a necessary and sufficient condition for strict convexity of the QoS region. This property holds for the class of log-convex interference functions,...
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