Measuring upper limb movement to analyze intra-body communication channel attenuation characteristics

Abstract

BACKGROUND:

This experiment was designed to study the respective effects of the closed-state human palm and dynamic arm bending on intra-body communication channel attenuation.

METHODS:

We selected the right upper arm of a healthy adult male as the experimental object to measure channel attenuation variation in a closed or open palm, and when the arm was bent, so as to analyze channel characteristics.

CONCLUSIONS:

The experiment showed that, in a quasi-static stable system, the effects of a closed palm on channel attenuation were negligibly minimal. In contrast, the physiological signal of the living body significantly interfered with the channel in the low-frequency mode. In the dynamic arm-bending experiment, we found that the attenuation variation range corresponds to the intersection angle (90 ${}^{\circ }$ $⩽\theta ⩽$ 180 ${}^{\circ }$ ) of the upper arm and forearm; these results provide the basis for the establishment of a theoretical model.