Exact and approximate maximum likelihood localization algorithms

By Senior Member Ieee Yiu-Tong Chan, Herman Yau, Chin Hang. IEEE Transactions on Vehicular Technology, 2006

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Time-of-arrival based localization under NLOS conditions (2006, methodology): “It computes, with the AML [20], a total of estimates of Θ .”
A Survey on TOA Based Wireless Localization and NLOS Mitigation Techniques (2009, methodology): “In order to find the minimum value of J, the gradient of J with respect to x is equated to zero, yielding [26]”
Accurate Passive Location Estimation Using TOA Measurements (2012, background): “Obviously, the estimator (10) is an unbiased one, and the mean of ni is zero.”
NLOS Identification and Weighted Least-Squares Localization for UWB Systems Using Multipath Channel Statistics (2008, methodology): “Copyright © 2008 İsmail Güvenç et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.”