Journal
IEEE WIRELESS COMMUNICATIONS LETTERS
Volume 10, Issue 3, Pages 542-546Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LWC.2020.3037095
Keywords
Maximum likelihood estimation; Noise measurement; Wireless sensor networks; Upper bound; Programming; Power measurement; Measurement uncertainty; Hybrid localization; unknown transmission parameters; non-line of sight (NLOS) bias mitigation
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This study proposes a robust method for source localization using RSS and TOA measurements in NLOS environments. By formulating a RWLS problem from the original non-convex ML estimation problem and tightening it with a convex-hull constraint, the NLOS bias is mitigated. Simulation results demonstrate the superior performance of the proposed method in various network scenarios and its excellence over existing methods.
This letter addresses the problem of source localization in non-line of sight (NLOS) environment using received signal strength (RSS) and time of arrival (TOA) measurements when both transmission time and power are unknown. To mitigate the NLOS bias, a robust weighted least square (RWLS) problem is formulated from original non-convex maximum-likelihood (ML) estimation problem using a set of tight approximations. The RWLS problem is further tightened by a novel convex-hull constraint and is ultimately solved using second-order cone programming (SOCP). Simulation results confirm the optimal performance of the proposed robust method in various network scenarios and also validate its excellence over state-of-art methods.
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