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The authors explore a flexible and non-intrusive opportunistic spectrum access control mechanism for cognitive radios that goes beyond the standard "Listen-Before-Talk" (LBT) strategy. They exploit the bi-directional nature of many primary communication systems to control cognitive radio access that is based on both spectral sensing and primary receiver acknowledgements. In this paper, the authors limit their attention on the ACK/NAK messages in primary data-link-control. They use partially observable Markov-decision processes to devise an optimized admission control policy. Their new method achieves high cognitive network throughput while offering robust protection of primary user signals.
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