Mobile localization using Doppler symmetric constraint in case of non-line-of-sight

This paper considers the scattering environment and demonstrates that we can solve the localization problem in the case of non-line-of-sight if we could separate the multipath components with the same absolute value of Doppler-shifted frequency and estimate accurate time and direction of arrival of each multi-path component. Using a Doppler symmetric constraint on the angles between moving direction of the mobile station and line-of-sight of scatterers, a novel set of localization equations is established and the target position is estimated by a 2D searching method. Simulation results show that the proposed method is superior to the conventional localization method by taking advantage of the environment information.