Cost-Efficient Efficient Indoor White Space Exploration Through Compressive Sensing
Abstract: Exploring the utilization of white spaces (vacant VHF and UHF TV channels) is a promising way to satisfy the rapidly growing radio frequency (RF) demand. Although a few white space exploration methods have been proposed in the past few years, they mainly focused on outdoor scenarios. In this paper, we propose a novel cost-efficient efficient indoor white space exploration method by exploiting the location dependence and channel dep dependence endence of TV spectrum in indoor environments. We first measure the UHF TV channels in a building, and study the spatial and spectral features of indoor white spaces. Then, we design a costcost eFficient Indoor White space EXploration (FIWEX) mechanism based on o the extracted features. Furthermore, we build a prototype of FIWEX and extensively evaluate its performance in real-world real world environments. The evaluation results show that FIWEX can identify 30.0% more indoor white spaces with 51.2% less false alarms compared ed with the best known existing solution.