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In this paper, we investigate a new type of channels named as "dying" channels, which are resulted in wireless networks subject to random fatal impacts, e.g., sensor networks under sudden physical attacks or cognitive radio networks with unpredictable primary user occupancy. Under such circumstances, it is critical to quantify how fast and reliable information can be collected over "dying"...
This paper studies the information-theoretic limits of a cognitive radio (CR) network under spectrum sharing with an existing primary radio (PR) network for wireless communications. In particular, the fading cognitive multiple-access channel (C-MAC) is studied, where multiple CR users transmit to the base station (BS) of the CR network under both individual transmit power constraints and a set of...
In this paper, we investigate the power and rate control schemes for multiple cognitive radio (CR) links in the same neighborhood, which operate over multiple channels (frequency bands) in the presence of licensed primary radios (PRs). Specifically, by considering a practical delay in spectrum sensing, an efficient algorithm based on dynamic programming (DP) is proposed to maximize the average sum-rate...
The distributed detection problem is considered with wireless sensors sending local decisions to a fusion center over slow-fading orthogonal multiple access channels. The J-divergence between the distributions under different hypotheses is used as the performance criterion. Given the slow-fading channels between the sensors and the fusion center, two new concepts called detection outage and detection...
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