NLOS Error Mitigation for TOA-Based Localization via Convex Relaxation

In this paper, we address the time-of-arrival (TOA) based localization problem in an adverse environment, where line-of-sight (LOS) signal propagation between the source and the sensor is not readily available, in which case we have to resort to non-line-of-sight (NLOS) signals. Two convex relaxatio...

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Published in:	IEEE transactions on wireless communications Vol. 13; no. 8; pp. 4119 - 4131
Main Authors:	Gang Wang, Chen, H., Youming Li, Ansari, Nirwan
Format:	Journal Article
Language:	English
Published:	New York, NY IEEE 01.08.2014 Institute of Electrical and Electronics Engineers The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:	Applied sciences Error detection Errors Exact sciences and technology Localization Measurement uncertainty Methods Noise Noise measurement Position (location) Position measurement Radiocommunication specific techniques Radiocommunications Relaxation methods Robustness Sensors Simulation State of the art Systems, networks and services of telecommunications Telecommunications Telecommunications and information theory Transmission and modulation (techniques and equipments) Wireless communication semidefinite programming second-order cone programming (SOCP) robust localization Non-line-of-sight time-of-arrival Performance evaluation Second order Line of sight propagation State of the art Measurement sensor Hostile environment Non line of sight propagation Data transmission Robust estimation Arrival time Relaxation Simulation Error detection Relaxation method Signal transmission Error correction Localization Transmission loss Software radio
ISSN:	1536-1276, 1558-2248
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Abstract	In this paper, we address the time-of-arrival (TOA) based localization problem in an adverse environment, where line-of-sight (LOS) signal propagation between the source and the sensor is not readily available, in which case we have to resort to non-line-of-sight (NLOS) signals. Two convex relaxation methods, i.e., the semidefinite relaxation (SDR) and the second-order cone relaxation (SOCR) methods, are proposed to mitigate the effect of NLOS errors on the localization performance. We consider two separate cases in which the information of the NLOS status is totally unknown and perfectly known, respectively. The proposed methods can be applied without knowing the distribution of NLOS errors. Moreover, we propose a NLOS error mitigation method that is robust to detection errors, which are generated in the process of detecting NLOS paths. Simulation results show that the proposed convex relaxation methods outperform some existing state-of-the-art methods.
AbstractList	In this paper, we address the time-of-arrival (TOA) based localization problem in an adverse environment, where line-of-sight (LOS) signal propagation between the source and the sensor is not readily available, in which case we have to resort to non-line-of-sight (NLOS) signals. Two convex relaxation methods, i.e., the semidefinite relaxation (SDR) and the second-order cone relaxation (SOCR) methods, are proposed to mitigate the effect of NLOS errors on the localization performance. We consider two separate cases in which the information of the NLOS status is totally unknown and perfectly known, respectively. The proposed methods can be applied without knowing the distribution of NLOS errors. Moreover, we propose a NLOS error mitigation method that is robust to detection errors, which are generated in the process of detecting NLOS paths. Simulation results show that the proposed convex relaxation methods outperform some existing state-of-the-art methods.
Author	Gang Wang Ansari, Nirwan Chen, H. Youming Li
Author_xml	– sequence: 1 surname: Gang Wang fullname: Gang Wang email: wanggang@nbu.edu.cn organization: Coll. of Inf. Sci. & Eng., Ningbo Univ., Ningbo, China – sequence: 2 givenname: H. surname: Chen fullname: Chen, H. organization: Southwest Jiaotong Univ., Chengdu, China – sequence: 3 surname: Youming Li fullname: Youming Li email: liyouming@nbu.edu.cn organization: Coll. of Inf. Sci. & Eng., Ningbo Univ., Ningbo, China – sequence: 4 givenname: Nirwan surname: Ansari fullname: Ansari, Nirwan email: Nirwan.Ansari@njit.edu organization: Dept. of Electr. & Comput. Eng., New Jersey Inst. of Technol., Newark, NJ, USA
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Keywords	semidefinite programming second-order cone programming (SOCP) robust localization Non-line-of-sight time-of-arrival Performance evaluation Second order Line of sight propagation State of the art Measurement sensor Hostile environment Non line of sight propagation Data transmission Robust estimation Arrival time Relaxation Simulation Error detection Relaxation method Signal transmission Error correction Localization Transmission loss Software radio
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SubjectTerms	Applied sciences Error detection Errors Exact sciences and technology Localization Measurement uncertainty Methods Noise Noise measurement Position (location) Position measurement Radiocommunication specific techniques Radiocommunications Relaxation methods Robustness Sensors Simulation State of the art Systems, networks and services of telecommunications Telecommunications Telecommunications and information theory Transmission and modulation (techniques and equipments) Wireless communication
Title	NLOS Error Mitigation for TOA-Based Localization via Convex Relaxation
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