| Title | CDMA-based Acoustic Local Positioning System for Portable Devices with Multipath Cancellation |
| Publication Type | Journal Article |
| Year of Publication | 2017 |
| Authors | Alvarez, FJ, Aguilera, T, López-Valcarce, R |
| Journal | Digital Signal Processing |
| Volume | 62 |
| Pages | 38-51 |
| Date Published | 03/2017 |
| ISSN | 1051-2004 |
| Keywords | compass, 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. |
| DOI | 10.1016/j.dsp.2016.11.001 |
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