Indoor Localization System Based on Correlation of MVDR Spatial Spectra

Indoor angle of arrival localization systems generally require the setup of multiple antenna arrays at fixed positions. They rely on line-of-sight connections for the localization of a mobile node. This paper presents a solution that consists of a single antenna array. By using the Minimum Variance Distortionless Response algorithm for angle of arrival estimation, a spatial spectrum is calculated from antenna array measurements. This spatial spectrum is correlated with a reference set of spatial spectra, resulting in an estimated position. The reference data set is not acquired with labour-intensive fingerprinting techniques, but with a ray tracing algorithm. The proposed system is evaluated in simulations to investigate the influence of Non-Line-Of-Sight (NLOS) connections and interfering multipath components. Results for various configurations show that reasonable performance in NLOS conditions is achievable.