On-line training of the path-loss model in Bayesian WLAN indoor positioning

Currently, an indoor positioning is a challenge application for location-based services (LBS) and proximity-based services (PBS). However, the indoor channel has dense multipath fading, causing more distance error than outdoor positioning. In this paper, the distance error analysis model is proposed for indoor positioning. The indoor channel is modeled as the sum of path loss model and multipath fading model. The path loss model is a linear regression model (LRM) based on Friis’ transmission formula, used for estimating the distance from received signal strength (RSS). The multipath fading is a Gaussian statistical model with zero mean, used for characterizing the multipath fading effect. The normalized distance error is evaluated and defined. The indoor channel with Bluetooth low energy (BLE) beacons is measured and compared with the proposed model. From the results, the normalized distance error obtained from the proposed model corresponds very well to measurement. This proposed model can be used as a tool for designing an indoor positioning system to obtain the specific distance error.

Download Full-text

Wi-Fi fingerprint-based approaches following log-distance path loss model for indoor positioning

2011 IEEE MTT-S International Microwave Workshop Series on Intelligent Radio for Future Personal Terminals ◽

10.1109/imws2.2011.6027190 ◽

2011 ◽

Cited By ~ 8

Author(s):

Sukhoon Jung ◽

Choon-oh Lee ◽

Dongsoo Han

Keyword(s):

Path Loss ◽

Indoor Positioning ◽

Loss Model ◽

Path Loss Model

Download Full-text

A New Filtering Algorithm for Generating Path Loss Model to Improve Accuracy of Trilateration-Based Indoor Positioning System

Journal of Physics Conference Series ◽

10.1088/1742-6596/1962/1/012009 ◽

2021 ◽

Vol 1962 (1) ◽

pp. 012009

Author(s):

L Susanto ◽

W Wibisono ◽

T Ahmad

Keyword(s):

Path Loss ◽

Indoor Positioning ◽

Positioning System ◽

Loss Model ◽

Path Loss Model ◽

Filtering Algorithm ◽

Improve Accuracy ◽

Indoor Positioning System

Download Full-text

Path Loss Model in Crowded Outdoor Environments Considering Multiple Human Body Shadowing of Multipath at 4.7GHz and 26.4GHz

IEICE Transactions on Communications ◽

10.1587/transcom.2018ebp3282 ◽

2019 ◽

Vol E102.B (8) ◽

pp. 1676-1688 ◽

Cited By ~ 1

Author(s):

Mitsuki NAKAMURA ◽

Motoharu SASAKI ◽

Wataru YAMADA ◽

Naoki KITA ◽

Takeshi ONIZAWA ◽

...

Keyword(s):

Human Body ◽

Path Loss ◽

Loss Model ◽

Path Loss Model ◽

Outdoor Environments

Download Full-text

A new path loss model based on the volumetric occupancy rate for the pine forests at 5G frequency band

International Journal of Microwave and Wireless Technologies ◽

10.1017/s175907872000152x ◽

2020 ◽

pp. 1-10

Author(s):

Abdullah Genc

Keyword(s):

Path Loss ◽

Forest Area ◽

Occupancy Rate ◽

Loss Model ◽

Path Loss Model ◽

Model Based ◽

Proposed Model ◽

Pine Trees ◽

Foliage Density ◽

Reference Measurements

Abstract In this paper, a new empirical path loss model based on frequency, distance, and volumetric occupancy rate is generated at the 3.5 and 4.2 GHz in the scope of 5G frequency bands. This study aims to determine the effect of the volumetric occupancy rate on path loss depending on the foliage density of the trees in the pine forest area. Using 4.2 GHz and the effect of the volumetric occupancy rate contributes to the literature in terms of novelty. Both the reference measurements to generate a model and verification measurements to verify the proposed models are conducted in three different regions of the forest area with double ridged horn antennas. These regions of the artificial forest area consist of regularly sorted and identical pine trees. Root mean square error (RMSE) and R-squared values are calculated to evaluate the performance of the proposed model. For 3.5 and 4.2 GHz, while the RMSEs are 3.983 and 3.883, the values of R-squared are 0.967 and 0.963, respectively. Additionally, the results are compared with four path loss models which are commonly used in the forest area. The proposed one has the best performance among the other models with values 3.98 and 3.88 dB for 3.5 and 4.2 GHz.

Download Full-text