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In this paper, we examine a cognitive spectrum access scheme in which a secondary user exploits the primary feedback information. We consider an overlay model in which the secondary user accesses the channel by certain access probabilities that are function of the spectrum sensing metric. In setting our problem, we assume that the secondary user can receive the primary link's feedback automatic repeat...
This paper presents optimization of sensing-transmission structure for dynamic spectrum access in cognitive radios with respect to Secondary User's probability of false alarm. In opportunistic spectrum access, the white spaces in the transmissions of primary users (PUs) have to be sensed and utilized by Secondary Users (SU). There is a continuous tradeoff between the competing goals of PU transmission...
In cognitive radio networks, previous works almost assume that the primary (licensed) traffic is time-slotted. In time-slotted cognitive radio networks, the secondary (unlicensed) users only need to spend a short time to sense the spectrum because the primary users' states (active or not active) are not changed during the whole secondary frame. However, in realistic cases, the primary traffic is non-time-slotted,...
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