Fabio E. Lapiccirella

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—In this paper, we investigate distributed control of multiple secondary users attempting to access the channel of a high priority primary user. Our aim is to maximize the sum cognitive (secondary) user throughput under the constraint of primary user's queue stability. We consider the effect of primary user link adaptation that allows the primary(More)
Cognitive radio systems capable of opportunistic spectrum access represent a new paradigm for improving the efficiency of current spectrum utilization. In this work, we present a novel cognitive channel access method based on learning from both primary channel transmissions and the receiver ARQ feedback signals. This new sensing-plus-confirmation scheme(More)
—We investigate an opportunistic channel access problem over multiple primary frequency bands. We exploit primary ACK/NAK packets overheard by the secondary users to overlay their communications on top of active primary channels. Applying the theory of multi-armed restless bandit (MARB), we determine the conditions that are needed for proving the optimality(More)
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