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
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.