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A new method for path-loss modeling

Published online by Cambridge University Press:  22 February 2019

Qiang Li
School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing, 100876, People's Republic of China
Hongxin Zhang*
School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing, 100876, People's Republic of China Beijing Key Laboratory of Work Safety Intelligent Monitoring, Beijing, 100876, People's Republic of China
Yang Lu
Global Energy Interconnection Research Institute Co., Ltd., Beijing, 102209, People's Republic of China
Tianyi Zheng
School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing, 100876, People's Republic of China
Yinghua Lv
School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing, 100876, People's Republic of China
Author for correspondence: Hongxin Zhang, E-mail:


In this paper, a new path-loss model for electromagnetic wave in an indoor multipath environment is proposed based on matching coefficient, polarization matching factor, and normalized field intensity direction function. This model is called the Friis-extension (Friis-EXT) model, because it operates as the Friis model under certain conditions. In addition, in the modeling process of the path-loss in an indoor environment, the reflective surfaces in the environment and form of the antenna are considered. Afterwards, the path-loss data in an indoor corridor environment are measured, and the maximum error between the theoretical value and the measured data is <7.5 dB. Finally, the Friis-EXT model is compared with some other traditional models, and the results show that the Friis-EXT model is the best one that matches the measurement data.

Research Papers
Copyright © Cambridge University Press and the European Microwave Association 2019 

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