TW-TOA based positioning in the presence of clock imperfections
Journal article, 2016

This manuscript studies the positioning problem based on two-way time-of-arrival (TW-TOA) measurements in semi-asynchronous wireless sensor networks in which the clock of a target node is unsynchronized with the reference time. Since the optimal estimator for this problem involves difficult nonconvex optimization, two suboptimal estimators are proposed based on the squared-range least squares and the least absolute mean of residual errors. We formulated the former approach as an extended general trust region subproblem (EGTR) and propose a simple technique to solve it approximately. The latter approach is formulated as a difference of convex functions programming (DCP), which can be solved using a concave–convex procedure. Simulation results illustrate the high performance of the proposed techniques, especially for the DCP approach.

Two-way time-of-arrival (TW-TOA)

Clock imperfection

Convex optimization

Trust region subproblems


Concave–convex procedure


Mohammad Reza Gholami

Campanja AB

Sinan Gezici

Bilkent Universitesi

Erik Ström

Chalmers, Signals and Systems, Communication and Antenna Systems, Communication Systems

Digital Signal Processing: A Review Journal

1051-2004 (ISSN) 1095-4333 (eISSN)

Vol. 59 19-30

Areas of Advance

Information and Communication Technology

Subject Categories

Communication Systems

Signal Processing



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