Radiated noise analysis via human body for intra-body communication

The transmission path of intra-body communication is composed of capacitance coupling among nodes. Therefore, a channel model of the communication is expressed by capacitive ambient elements. Such a communication is greatly affected by external noise because the balance of the transmission path deteriorates due to environmental factors. There is a serious problem in that radiated noise via the human body emitted from an electric light or peripheral electronic equipment is likely to be transmitted along the same path as a signal by capacitance coupling. We investigated a channel model and estimated radiated noise via the human body based on experiments and circuit simulation. The validity of the channel model was clarified from noise measurement. When an additional electrode was connected to a ground electrode in a measurement system for a practical scene, the noise reduction rating was 5.11 dB. However, actually, reducing the noise is difficult. Therefore, reducing the noise source in such a communication is necessary.