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We consider a cognitive radio network where primary users (PUs) employ network coding for data transmissions. We view network coding as a spectrum shaper, in the sense that it increases spectrum availability to secondary users (SUs) and offers more structure of spectrum holes, which in turn improves the predictability of the primary spectrum. With this spectrum shaping effect of network coding, each...
We characterize the asymptotic behavior of the throughput capacity and packet delay in cognitive radio (CR) networks. For the model where the network density grows, we derive the scaling laws for secondary users (SUs) who opportunistically access the spectrum when primary users (PUs) are idle. More specifically, we assume that SUs do not know PU (transmitter or receiver) locations a priori, and access...
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