TitleCDMA-based Acoustic Local Positioning System for Portable Devices with Multipath Cancellation
Publication TypeJournal Article
Year of Publication2017
AuthorsAlvarez, FJ, Aguilera, T, López-Valcarce, R
JournalDigital Signal Processing
Date Published03/2017
Keywordscompass, wsn
Abstract This paper presents an acoustic local positioning system (ALPS) suitable for indoor positioningof portable devices such as smartphones or tablets, based on the transmission of high frequencyCDMA-coded signals from a fixed network of beacons. The main novelty of the proposed ALPS isits capability to mitigate the effects of multipath propagation by performing an accurate estimationof the Line-of-Sight Time-of-Flights (LOS-TOF) through the Matching Pursuit algorithm. Signaldetection, multipath cancellation and positioning estimation all take place within the portable device,which provides a graphical representation of the updated position in less than a second. Theperformance of the Matching Pursuit algorithm is analyzed in a real scenario and the results showthat the proposed method is capable to retrieve the multipath-free System Availability under strongmultipath conditions with SNR levels as low as 0 dB.