Location Error Detection and Compensation for IEEE 802.15.4a Networks in Indoor Environments

Youngbae KONG  Junseok KIM  Younggoo KWON  Gwitae PARK  

Publication
IEICE TRANSACTIONS on Communications   Vol.E93-B   No.8   pp.2077-2081
Publication Date: 2010/08/01
Online ISSN: 1745-1345
Print ISSN: 0916-8516
Type of Manuscript: Special Section LETTER (Special Section on Implementation, Experiments, and Practice for Ad Hoc and Mesh Networks)
Category: 
Keyword: 
IEEE 802.15.4a,  localization,  non-line-of-sight,  Kalman filter,  

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Summary: 
IEEE 802.15.4a standard enables location-aided routing or topology control in ZigBee networks, since it uses time-of-arrival (TOA)-based ranging technique. However, TOA based techniques may yield location error due to the non-line-of-sight (NLOS) effects, and hence degrade the network performance. In this letter, we demonstrate the impact of NLOS on the localization performance and propose a location error detection and compensation algorithm for IEEE 802.15.4a networks. The proposed algorithm detects NLOS by using the min-max algorithm and compensates the location error by using the Kalman filter. Experimental results show that the proposed algorithm significantly reduces the localization errors in indoor environments.