期刊
IEEE WIRELESS COMMUNICATIONS LETTERS
卷 10, 期 1, 页码 111-115出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LWC.2020.3021991
关键词
Localization; signal strength; maximum likelihood; least squares
资金
- Rogers Communications Canada Inc., BC, Canada, through the MITACS Accelerate Program
This paper focuses on localization using received signal strength, addressing unknown transmit power and log-distance pathloss exponent. It proposes maximum-likelihood estimation, two-step linear least squares estimation, and a maximum-a-posteriori estimator for joint estimation of source location and PLE, demonstrating improved localization accuracy.
We consider localization from the received signal strength (RSS) when the transmit power and the log-distance pathloss exponent (PLE) are unknown. The unknown transmit power problem is handled by working with the difference of RSS (DRSS) from a reference node. The unknown PLE is statistically modelled as a Gaussian distributed random variable. A maximum-likelihood estimation procedure is firstly proposed to obtain the ratio-of-distances in closed-form. Next, in order to obtain the source location from the ratio-of-distance estimates, we propose a two-step linear least squares (TLLS) estimator which exploits the known relation between the source coordinates and the range variable. Finally, we propose a maximum-a-posteriori (MAP) estimator which jointly estimates the source location and the PLE by maximizing the posterior likelihood of the DRSS values, given the distribution of the PLE. Numerical studies validate the improved localization accuracy of the proposed estimators over the state-of-the-art.
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