Abstract
WiFi-based indoor localization techniques are critical for location-based services. Among them, fingerprint-based method gains considerable interest due to its high accuracy and low equipment requirement. One of the major challenges faced by fingerprint-based position system is that in some places there are not enough access points (AP) to provide features for accurate location. To address that, we propose a novel fingerprint-based system using only a single AP. We propose a novel phase decomposition method to obtain the phase of multipath provided by a AP and use the decomposed phase as a fingerprint after the feature exaction by principal component analysis (PCA). Performance in the laboratory, meeting room, and corridor is investigated, and our system is also compared with a RSSI-based and a CSI-based fingerprint localization system. As the experimental results suggest, the minimum mean distance error is 0.6 m in the laboratory, 0.45 m in the meeting room, and 1.08 m in the corridor, outperforming the other two systems.
Highlights
In outdoor environments, GPS-based localization techniques make our lives more convenient in many aspects [1, 2]
We try to advance channel state information (CSI)-based indoor localization to achieve centimeter-level localization resolution only by using a single commercial access points (AP) under the phase of multipath offered by CSI of subcarriers using multiple input multiple output (MIMO) to derive the location signatures
We evaluate the performance of our system with received signal strength indication (RSSI)-based and CSI-based localization system
Summary
GPS-based localization techniques make our lives more convenient in many aspects [1, 2]. To achieve higher accuracy by obtaining high data dimension, FIFS [23] and CSI-MIMO [20] systems, both aggregate amplitude and phase information of all subcarriers of all antennas for indoor location fingerprinting. We try to advance CSI-based indoor localization to achieve centimeter-level localization resolution only by using a single commercial AP under the phase of multipath offered by CSI of subcarriers using multiple input multiple output (MIMO) to derive the location signatures. 2 Related work Increasing demand of location-based service (LBS) draws a great deal of attention to WiFi-based localization in indoor environments. Compared to using RSSI of WiFi for localization such as Horus [10] and RADAR [33], CSI-based localization systems provide higher accuracy. CRIL [37] accounts for dynamic environments introduces coupled RSSI and INS localization system to improve the efficiency of location estimation
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