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The authors investigate the dynamic spectrum sharing problem among primary and secondary users in a cognitive radio network. They consider the scenario where primary user's exhibit on-off behavior and secondary users are able to dynamically measure/estimate sum interference from primary users at their receiving ends. For such a scenario, they solve the problem of fair spectrum sharing among secondary users subject to their QoS constraints (in terms of minimum SINR and transmission rate) and interference constraints for primary users. Since tracking channel gains instantaneously for dynamic spectrum allocation may be very difficult in practice, they consider the case where only mean channel gains averaged over short-term fading are available.
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