TY - GEN
T1 - Expectation maximization-based passive localization in asynchronous wireless networks
AU - Yuan, Weijie
AU - Wu, Nan
AU - Cheng, Tianfeng
AU - Wang, Hua
AU - Kuang, Jingming
N1 - Publisher Copyright:
© 2015 IEEE.
PY - 2016/4/6
Y1 - 2016/4/6
N2 - This paper studies TOA-based localization of a passive target with one transmitter and multiple distributed receivers. Different from the existing studies which assume synchronous or quasi-synchronous network, we consider a more practical case in which all the receivers have different time offsets to the transmitter. To tackle the multi-dimensional optimization problem in the maximum likelihood estimation, an expectation maximization (EM) algorithm is proposed. Taylor expansion to the result obtained in the expectation step is applied, which enables us to give a closed-form solution of localization in the maximization step. The Cramér-Rao bound of the target's position estimation with asynchronous receivers is derived. Simulation results show that the proposed EM-based algorithm outperforms the traditional methods and can perfectly attach the derived Cramér-Rao bound.
AB - This paper studies TOA-based localization of a passive target with one transmitter and multiple distributed receivers. Different from the existing studies which assume synchronous or quasi-synchronous network, we consider a more practical case in which all the receivers have different time offsets to the transmitter. To tackle the multi-dimensional optimization problem in the maximum likelihood estimation, an expectation maximization (EM) algorithm is proposed. Taylor expansion to the result obtained in the expectation step is applied, which enables us to give a closed-form solution of localization in the maximization step. The Cramér-Rao bound of the target's position estimation with asynchronous receivers is derived. Simulation results show that the proposed EM-based algorithm outperforms the traditional methods and can perfectly attach the derived Cramér-Rao bound.
KW - Cramér-Rao bound
KW - Passive Localization
KW - asynchronous wireless networks
KW - expectation maximization
UR - http://www.scopus.com/inward/record.url?scp=84967167038&partnerID=8YFLogxK
U2 - 10.1109/ICCChina.2015.7448712
DO - 10.1109/ICCChina.2015.7448712
M3 - Conference contribution
AN - SCOPUS:84967167038
T3 - 2015 IEEE/CIC International Conference on Communications in China, ICCC 2015
BT - 2015 IEEE/CIC International Conference on Communications in China, ICCC 2015
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - IEEE/CIC International Conference on Communications in China, ICCC 2015
Y2 - 2 November 2015 through 5 November 2015
ER -