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Characterizing Effective Spectral Opportunities and Shadowing Influence Inside Large Buildings for Short Range CRWS Use

Abstract:

The future high demand for wireless services, especially inside smart buildings located in dense urban areas, and the possible saturation of the spectrum used by short-range wireless systems have allowed the search for solutions based on the Dynamic Spectrum Access model. Cognitive Radio system is a proposed solution; it works allowing that an incumbent operator share their available assigned spectrum with other service operator, in order to improve the efficiency on the spectrum use. To know only the availability of an electromagnetic spectrum segment is not enough so there are to check that their use by other operator does not affect to the surrounding incumbent users (e.g. a building inner incumbent users). The objective of this study is to characterize by simulation process the minimal effective spectral availability inside large buildings assuming a deployment of the incumbent system users in their inner, taking in account the shadowing phenomena influence too. The results show that the effective spectral availability is distributed on the 60% smart building inner area for large buildings, and it could decrease between 30% and 40% depending on the shadowing level and the distance from transmitter.