TOA Based Localization Under NLOS in Cognitive Radio Network

  • Dazhi BaoEmail author
  • Hao Zhou
  • Hao Chen
  • Shaojie Liu
  • Yifan Zhang
  • Zhiyong  Feng
Conference paper
Part of the Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering book series (LNICST, volume 172)


In this paper, we consider cooperative localization of primary users (PU) in a cognitive radio network (CRN) using time-of-arrival (TOA). A two-step none-line-of-sight (NLOS) identification algorithm is proposed for the situation where both NLOS error distribution and channel model are not available. In the first step the TOA measurements are clustered into groups. The groups with a dispersion higher than a predefined threshold are identified as NLOS and discarded. In order to make the threshold more reasonable, Ostu’s method, a threshold selection method for image processing is utilized. The second step is introduced to correct the error of possible surviving NLOS. To increase the accuracy of estimated position when line-of-sight (LOS) paths are limited, we proposed a result reconstruction method. Simulation results show that our algorithm can effectively identify NLOS paths and improve positioning accuracy compared to existing works.


Cognitive radio network LOS identify Time of arrival Location estimation Least square method 



This work was supported by the National Natural Science Foundation of China (61227801), the National Key Technology R&D Program of China (2014ZX03001027-003).


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Copyright information

© ICST Institute for Computer Sciences, Social Informatics and Telecommunications Engineering 2016

Authors and Affiliations

  • Dazhi Bao
    • 1
    Email author
  • Hao Zhou
    • 1
  • Hao Chen
    • 1
  • Shaojie Liu
    • 1
  • Yifan Zhang
    • 1
  • Zhiyong  Feng
    • 1
  1. 1.Key Laboratory of Universal Wireless Communications, Ministry of Education, Wireless Technology Innovation Institute (WTI)Beijing University of Posts and TelecommunicationsBeijingPeople’s Republic of China

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