TY - JOUR T1 - CDMA-based Acoustic Local Positioning System for Portable Devices with Multipath Cancellation JF - Digital Signal Processing Y1 - 2017 A1 - Fernando J. Alvarez A1 - Teodoro Aguilera A1 - R. López-Valcarce KW - compass KW - wsn AB -
This paper presents an acoustic local positioning system (ALPS) suitable for indoor positioning
of portable devices such as smartphones or tablets, based on the transmission of high frequency
CDMA-coded signals from a fixed network of beacons. The main novelty of the proposed ALPS is
its capability to mitigate the effects of multipath propagation by performing an accurate estimation
of the Line-of-Sight Time-of-Flights (LOS-TOF) through the Matching Pursuit algorithm. Signal
detection, 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. The
performance of the Matching Pursuit algorithm is analyzed in a real scenario and the results show
that the proposed method is capable to retrieve the multipath-free System Availability under strong
multipath conditions with SNR levels as low as 0 dB.
VL - 62 ER -