Determination of Cramer-Rao lower bound (CRLB) as an optimality criterion for the problem of localization in wireless sensor networks (WSNs) is a very important issue. Currently, CRLBs have been derived for line-of-sight (LOS) situation in WSNs. However, one of major problems for accurate localization in WSNs is non-line-of-sight (NLOS) propagation. This article proposes two CRLBs for WSNs loca...

The issue of channel state information at the transmitter is investigated using MIMO channel measurements and by deriving expressions for ergodic and outage capacity in a Rayleigh fading channel. Expressions for bit error rates in Rayleigh fading channels are also presented for orthogonal space time block codes and for beamforming where the bit error rates in the beamforming case follow from th...

Abstract Multipath interference seriously degrades the performance of Global Navigation Satellite System (GNSS) positioning in an urban canyon. Most current multipath mitigation algorithms suffer from heavy computational load or need external assistance. We propose a algorithm based on steepest descent approach, which has merits less and no for aid. A new ranging code tracking loop is designed ...

In this paper, we present measurement results of the experimental validation of the UWB localization platform under Line-Of-Sight (LOS) and Non-Line-Of-Sight (NLOS) conditions. The platform is based on the Time Difference of Arrival (TDoA) technique and the energy detection receiver. TDoA based localization systems require minimum four anchors to provide 3D position data. In order to deal with ...

Mobile terminal location has attracted much interest for its applications in emergency communications, location-sensitive browsing, and resource allocation. This paper introduces the use of nonparametric kernel-based estimators for location of mobile terminals using measurements of propagation delays. It is demonstrated that these estimators perform better than the previously used parametric ma...

5G positioning is a very promising area that presents many opportunities and challenges. Many existing techniques rely on multiple anchor nodes line-of-sight (LOS) paths, or single reference node single-bounce non-LOS (NLOS) paths. However, in dense multipath environments, identifying the LOS assumptions challenging. The multi-bounce paths will make accuracy deteriorate significantly. We propos...

Target localization has a wide range of military and civilian applications in wireless mobile networks. Examples include battle-field surveillance, emergency 911 (E911), traffic alert, habitat monitoring, resource allocation, routing, and disaster mitigation. Basic localization techniques include time-of-arrival (TOA), direction-of-arrival (DOA) and received-signal strength (RSS) estimation. Te...