Browsing by Keywords "Maximum likelihood estimator"
Now showing items 1-11 of 11
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A comparison of two methods for fusing information from a linear array of sonar sensors for obstacle localization
(IEEE, 1995)The performance of a commonly employed linear array of sonar sensors is assessed for point-obstacle localization intended for robotics applications. Two different methods of combining time-of-flight information from the ... -
A distributed positioning algorithm for cooperative active and passive sensors
(IEEE, 2010)The problem of positioning a target node is studied for wireless sensor networks with cooperative active and passive sensors. Two-way time-of-arrival and time-difference-of-arrival measurements made by both active and ... -
Enhanced position estimation via node cooperation
(IEEE, 2010)Two-way time-of-arrival (TW-ToA) is a widely used ranging protocol that can provide the distance between two devices without time synchronization. One drawback of the TW-ToA is poor positioning accuracy in the absence of ... -
Estimation theoretic analyses of location secrecy and ris-aided localization under hardware impairments
(Bilkent University, 2022-06)In this thesis, we present estimation theoretic analyses of location secrecy and reconfigurable intelligent surface (RIS) aided localization under hardware impairments. First, we consider a wireless source localization ... -
Fundamental limits on localization in single input multiple output visible light systems
(Bilkent University, 2017-09)Visible light systems have recently been considered as an e ective and promising solution for indoor positioning. In this thesis, a theoretical accuracy analysis is conducted for position estimation in visible light ... -
Hybrid TW-TOA/TDOA positioning algorithms for cooperative wireless networks
(IEEE, 2011)The problem of positioning an unknown target is studied for a cooperative wireless sensor network using hybrid two-way time-of-arrival and time-difference-of-arrival measurements. A maximum likelihood estimator (MLE) can ... -
Positioning algorithms for cooperative networks in the presence of an unknown turn-around time
(IEEE, 2011)This paper addresses the problem of single node positioning in cooperative network using hybrid two-way time-of-arrival and time-difference-of-arrival where, the turn-around time at the target node is unknown. Considering ... -
Statistics of the MLE and approximate upper and lower bounds-Part I: Application to TOA estimation
(Institute of Electrical and Electronics Engineers Inc., 2014)In nonlinear deterministic parameter estimation, the maximum likelihood estimator (MLE) is unable to attain the Cramér-Rao lower bound at low and medium signal-to-noise ratios (SNRs) due the threshold and ambiguity phenomena. ... -
Statistics of the MLE and approximate upper and lower bounds-part II: Threshold computation and optimal pulse design for TOA estimation
(Institute of Electrical and Electronics Engineers Inc., 2014)Threshold and ambiguity phenomena are studied in Part I of this paper where approximations for the mean-squared error (MSE) of the maximum-likelihood estimator are proposed using the method of interval estimation (MIE), ... -
Time-delay estimation in dispersed spectrum cognitive radio systems
(SpringerOpen, 2010)Time-delay estimation is studied for cognitive radio systems, which facilitate opportunistic use of spectral resources. A two-step approach is proposed to obtain accurate time-delay estimates of signals that occupy multiple ... -
Volatile organic compound plume detection using wavelet analysis of video
(IEEE, 2008-10)A video based method to detect volatile organic compounds (VOC) leaking out of process equipments used in petrochemical refineries is developed. Leaking VOC plume from a damaged component causes edges present in image ...
