Joint Network Capacity Region for Cognitive Networks Heterogeneous Environments and RF-Environment Awareness

In this paper, we characterize the joint network capacity region for a licensed broadcast (primary) and ad hoc cognitive (secondary) network in a heterogeneous environment, including indoor and outdoor transmissions, under various spectrum (white space) detection techniques. Each technique delivers a different degree of RF-environment awareness - the more a device knows about its environment the larger the network capacity region. To quantify the gains, we develop a simple stochastic model capturing the interdependency amongst primary and secondary nodes and compare their joint capacity. Cognitive devices using the classical signal energy detection method are shown to perform poorly due to limitations on detecting primary transmitters in environments with indoor shadowing. This can be circumvented through direct use (e.g., database access) of location information on primary transmitters, or better yet, on that of primary receivers. The specific capacity trade-off between primary and ...

• Type: Journal
• Year: 2011
• Where: JSAC
• Authors: Yuchul Kim, Gustavo de Veciana
• Keywords: JSAC 2011, Network Capacity Regions, Primary Transmitters, Signal Energy Detection