Research Projects

Accumulative Interference Modeling for Cognitive Radios with Distributed Channel Access

Ahmad Bahai, Sofie Pollin and Michael Timmers¹

UC MICRO, Interuniversity Micro-Electronics Center (IMEC), European Commission

A Cognitive Radio (CR) network should be able to sense its environment and adapt its communication to utilize unused licensed spectrum without interfering with incumbent users. Properly modeling the expected interference from the CR network is therefore very important in the definition of coexistence rules to efficiently protect the incumbent user. In this project we will model the accumulative interference generated from a large-scale CR network and investigate how the CR network density will affect the sensing requirements to meet an interference constraint. More specifically, our model considers the impact of discrete topology, the impact of imperfect sensing and the impact of the distributed channel access scheme. This will enable a more realistic analysis and simplify the development of more intelligent power control algorithms.

[1]

M. Timmers et al."Accumulative Interference Modeling for Cognitive Radios with Distributed Channel Access ," 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications, 2008. CrownCom 2008.

¹Interuniversity Micro-electronics Center