EngineeringArchitectural EngineeringElectrical EngineeringMobile ComputingSpatial AnalysisWireless CommunicationsBuilding AutomationBuilding Automation SystemsIndoor LocalizationWireless Channel ModelingWireless NetworksChannelsIndoor PropagationLocation EffectsSignal Strength MappingWhite Space Communications
Exploring the utilization of white spaces (vacant VHF and UHF TV channels) is a promising way to satisfy the rapid growth of the radio frequency (RF) demand. Although a few outdoor white space exploration methods have been proposed in the past few years, researches that focus on indoor white space exploration just emerge recently. In this paper, we propose a novel cost-efficient indoor white space exploration method by exploiting the location dependence and channel dependence of TV channels' signal strength in indoor environments. We measure the UHF TV channels in a building, and study the temporal and spatial features of indoor white spaces. Based on the extracted features, we design a cost-eficient Indoor White space EXploration mechanism, namely FIWEX. Furthermore, we build a prototype of FIWEX and extensively evaluate its performance in real world environments. The evaluation results show that FIWEX can identify 47.8% more indoor white spaces with 38.4% less false alarms compared with the best known existing solution.
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