PCM-Air Heat Exchangers: Slab Geometry

Abstract

In this paper, we provide a new perspective for analyzing spectrumoccupancy by introduced an M/M/1 queuing model to generate accuratetemporal and frequency behavior of various wireless transmissions.Our proposed research builds upon existing concepts in the open literaturein order to develop a more accurate time-varying spectrum occupancymodel. This model can be employed by wireless researchers for evaluatingnew wireless communication and networking algorithms and techniquesdesigned to perform dynamic spectrum access (DSA). Using statisticalcharacteristics extracted from actual radio frequency measurements,?rst- and second-order parameters are employed in a statistical spectrumoccupancy model based on a combination of several different probabilitydensity functions (PDFs) de?ning various features of a speci?c spectrumband with several concurrent transmissions. To assess the accuracyof the model, the output characteristics of the proposed spectrumoccupancy model are compared with real-time radio frequencymeasurements in the paging and ISM bands.