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CDMA-based acoustic local positioning system for portable devices with multipath cancellation

机译:具有多径取消的便携式设备的CDMA的声学局部定位系统

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摘要

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. (C) 2016 Elsevier Inc. All rights reserved.
机译:本文介绍了适用于来自来自固定网络的高频CDMA编码信号的高频CDMA编码信号的便携式设备(例如智能手机或片剂)室内定位的声学局部定位系统(ALPS)。 所提出的阿尔卑斯州的主要新颖性是通过匹配追踪算法进行准确估计观察飞行时间(LOS-TOF)来减轻多径传播的影响。 信号检测,多路径消除和定位估计全部在便携式设备内进行,其在少于一秒钟内提供更新位置的图形表示。 在真实场景中分析了匹配追踪算法的性能,结果表明,该方法能够在强大的多径条件下使用SNR水平低至0 dB的SNR水平来检索多径的系统可用性。 (c)2016年Elsevier Inc.保留所有权利。

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