Enhancements to linear least squares localization through reference selection and ML estimation
Date
2008-03-04Source Title
IEEE Wireless Communications and Networking Conference, WCNC 2008
Publisher
IEEE
Pages
284 - 289
Language
English
Type
Conference PaperItem Usage Stats
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Abstract
Linear least squares (LLS) estimation is a low complexity but sub-optimum method for estimating the location of a mobile terminal (MT) from some distance measurements. It requires selecting one of the fixed terminals (FTs) as a reference FT for obtaining a linear set of expressions. However, selection of the reference FT is commonly performed arbitrarily in the literature. In this paper, a method for selection of the reference FT is proposed, which improves the location accuracy compared to a fixed selection of the reference FT. Moreover, a covariancematrix based LLS estimator is proposed in line of sight (LOS) and non-LOS (NLOS) environments which further improves accuracy since the correlations between the observations are exploited. Simulation results prove the effectiveness of the proposed techniques. © 2008 IEEE.
Keywords
Least-squares (LS) estimationLinearization
Maximum likelihood estimation (MLE)
Reference selection
Wireless localization
Channel capacity
Curve fitting
Electric appliances
Estimation
Geodesy
Least squares approximations
Port terminals
Surface reconstruction
Wireless telecommunication systems