Provided by: EURASIP
Date Added: Feb 2012
In this paper, the authors study the coexistence and optimization of a centralized orthogonal frequency-division multiple access-based Multiuser Cognitive Radio (MCR) system which coexists with a cellular Primary System (PS). Two different spectrum sharing methods, i.e., the spectrum underlay/overlay, are utilized for different co-existent frameworks, in which, the sharing method is adapted to one of them based on the distance between two base stations and the interference limit in the PS. They consider a PS-assistance-based coexistent architecture and propose a joint power control and interference management method to avoid unacceptable interference to Primary Users (PU).