Discovering Shadowing Effects Over Effective Spectrum Availability Inside Smart Buildings for Cognitive Short Range Systems Operation

Applying the Cognitive Radio paradigm to short-range systems inside buildings, it is intended to control two major drawbacks. The first one refers to controlling the efficiency in the use of the spectrum in interior scenarios, and the second is to overcome the inconvenience in the quality of service that arises when there are large quantities of short-range systems interfering with each other. Estimating the effective spectrum available inside a smart building is a big challenge. To do so, we must consider the deployment of users of the primary system, whose band would be reused. Large amounts of spectral opportunities have been found for the primary band, especially on the lower floors of the building. However, when considering the effect of shadowing on the interior of the building, it is shown that effective spectrum availability decreases.