Computer Science – Information Theory
Scientific paper
2009-05-19
Computer Science
Information Theory
to be presented at IEEE ICC 2009. This posting is the same as the original one. Only author's list is updated that was unfortu
Scientific paper
In this paper we describe a model for calculating the aggregate interference encountered by primary receivers in the presence of randomly placed cognitive radios (CRs). We show that incorporating the impact of distance attenuation and lognormal fading on each constituent interferer in the aggregate, leads to a composite interference that cannot be satisfactorily modeled by a lognormal. Using the interference statistics we determine a number of key parameters needed for the deployment of CRs. Examples of these are the exclusion zone radius, needed to protect the primary receiver under different types of fading environments and acceptable interference levels, and the numbers of CRs that can be deployed. We further show that if the CRs have apriori knowledge of the radio environment map (REM), then a much larger number of CRs can be deployed especially in a high density environment. Given REM information, we also look at the CR numbers achieved by two different types of techniques to process the scheduling information.
Dmochowski Pawel A.
Hanif Muhammad Fainan
Shafi Mansoor
Smith Peter J.
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