Hybrid TOA/AOA estimation error test and non-line of sight identification In wireless location

Chin Der Wann*, Han Yi Lin

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

14 Scopus citations


In this paper, a modified time-of-arrival (TOA) estimation error test and a hybrid time-of-arrival/angle-of-arrival (TOA/AOA) estimation error test for identification of line of sight (LOS) base stations (BSs) are proposed. The proposed schemes aim to improve the location accuracy of wireless location systems suffering from the non-line of sight (NLOS) propagation errors. The modified TOA-based estimation error test is considered a straightforward approach in identifying the LOS-BS set when the number of LOS BSs is greater than or equal to three. When both TOA and AOA metrics are available, hybrid TOA/AOA squares of normalized estimation errors are formulated by adopting the approximate maximum likelihood (AML) estimation. The proposed hybrid estimation error test scheme is capable of identifying the LOS/NLOS status of each BS, and performing location estimation in the situation where only two LOS BSs exist. Simulation results show that the proposed schemes are capable of correctly identifying the LOS BSs and improving the overall location accuracy.

Original languageEnglish
Pages (from-to)859-873
Number of pages15
JournalWireless Communications and Mobile Computing
Issue number6
StatePublished - 06 2009
Externally publishedYes


  • Approximate maximum likelihood
  • Estimation error test
  • NLOS identification
  • Non-line of sight
  • Wireless location


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