Multipath Signal Mitigation for Indoor Localization Based on MIMO FMCW Radar System

Indoor human localization (IHL) is an important application of the internet of things. Multipath effects are the most challenging problem for successful IHL when using radar, and thus, they should be mitigated properly. Therefore, effective solutions for indoor multipath mitigation are devised in th...

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Bibliographic Details
Published in:IEEE internet of things journal 2024-01, Vol.11 (2), p.1-1
Main Authors: Park, Jeong-Ki, Park, Jae-Hyun, Kim, Kyung-Tae
Format: Article
Language:English
Subjects:
Continuous radiation
Direction of arrival
Domains
Doppler effect
False alarms
Ghost mitigation
Indoor environments
Internet of Things
Localization
MIMO communication
multipath
multiple-input multiple-output (MIMO) frequency-modulated continuous-wave (FMCW) radar
Radar
Radar antennas
Radar echoes
Radar equipment
remote sensing
RF signals
US Department of Defense
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Summary:Indoor human localization (IHL) is an important application of the internet of things. Multipath effects are the most challenging problem for successful IHL when using radar, and thus, they should be mitigated properly. Therefore, effective solutions for indoor multipath mitigation are devised in this paper based on a co-located multiple-input multiple-output (MIMO) frequency-modulated continuous-wave (FMCW) radar without a priori information of reflection geometry and training datasets. To this end, a velocityazimuth domain suitable for false alarm reduction under severe multipath propagations rather than conventional domains is suggested based on an in-depth analysis of radar echoes from the indoor environment. Then, intra-and inter-frame integration are exploited to enhance the human signal-to-interference-plus-noise ratio, which helps improve the human detection probability. Finally, the detected signal is identified as a multipath based on whether the direction-of-arrival and direction-of-departure are different. The proposed framework is demonstrated through experiments conducted in a seminar room using a commercial MIMO FMCW radar. The results indicate that the multipath components are explicitly discriminated from the backscattering of an individual using the proposed scheme. Ghost targets induced by multipath can be suppresed owing to the proposed framework, and therefore robust IHL can be achieved.
ISSN:2327-4662
2327-4662
DOI:10.1109/JIOT.2023.3292349