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Cognitive radio networks enable secondary users to utilize spare bandwidth of primary users by limiting their interference. Moving beyond the traditional listen-before-talk paradigm, the authors propose a cognitive access methodology that exploits the feedback channel in two-way primary communication links for better spectrum utility and protection against interference. They let secondary users dynamically control access and power based on primary ACK/NACK messages. They develop an optimal access policy applicable to multiple secondary user pairs. They also devise a distributed power control policy for the multiple secondary users to maximize their individual throughput without significant cumulative interference to the primary link. Their distributed access and power control schemes can effectively provide good SU performance and primary protection without requiring central coordination.
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