Statistical Analysis of On-body Radio Propagation Channel for Body-centric Wireless Communications

摘要

This paper presents the experimental investigation of on-body radio propagation channel utilizing textile monopole antenna at 2.45 GHz. The measurement campaign was carried out in the anechoic chamber, considering stationary movement of the human body. The position of the transmitted antenna was fixed on the right of the upper arm of the human body and the received antenna was varied on several different potential on-body locations for body-centric wireless communication (BCWC) applications. The investigation was aimed to characterize the reflection coefficient and path loss of on-body radio channel when the antenna was placed in the vicinity of human body. A statistical analysis of path loss was also performed. The results showed that the measured reflection coefficient of four on-body positions experienced an upward frequency shift at a minimum of 0.2% compared to the simulated results due to the body coupling effect. In the anechoic chamber, the highest path loss was found for right upper arm-left ankle link while the lowest path loss was observed on the right upper arm-right chest link, proving that the closer a received antenna to the transmitted antenna, the better signal reception will be obtained. Based on the measurement results, it could be seen that the lognormal distribution fits very well to the on-body radio channel for narrowband frequency.