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

作者：Wann, Chin Der^*; Lin, Han Yi

来源：Wireless Communications and Mobile Computing, 2009, 9(6): 859-873.

DOI：10.1002/wcm.799

• wireless location
• non-line of sight
• estimation error test
• approximate maximum likelihood
• NLOS identification

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.

• 出版日期2009-6
• 单位中山大学