Cognitive Networks Achieve Throughput Scaling of a Homogeneous Network

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Executive Summary

The authors study two distinct, but overlapping, networks that operate at the same time, space, and frequency. The first network consists of n randomly distributed primary users, which form either an ad hoc network, or an infrastructure supported ad hoc network with l additional base stations. The second network consists of m randomly distributed, ad hoc secondary users or cognitive users. The primary users have priority access to the spectrum and do not need to change their communication protocol in the presence of secondary users. The secondary users, however, need to adjust their protocol based on knowledge about the locations of the primary nodes to bring little loss to the primary network's throughput.

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