Hello, everyone!
Today, I would like to share with you the sensor nodes design of WBAN (Wireless Body Area Network) technology.
Figure 1. A wireless sensor node in a WBAN is depicted in this block diagram.
The purpose of sensor nodes is to capture raw signals from the human body. As depicted in the above Figure 1, a sensor node performs three tasks:
Signal detection via a front-end,
Digitalization/controlling/coding for multi-access communication, and
ultimately wireless transmission via radio transceiver technology.
In addition to data collecting and analysis, the microcontroller retains a power management strategy that optimizes the energy distribution from the battery. For the blocks that aren't working, it should be configured to turn off the battery connections (i.e. during sleep mode).
A human body's signal is generally feeble and accompanied with noise. To begin, the signal should be amplified to improve its power. After that, it goes through a screening stage to get rid of undesirable signals and noise.
After that, it will be transformed to digital for digital processing using an Analog to Digital Conversion (ADC) stage. The microprocessor subsequently processes and stores the digitized signal (i.e. microcontroller).
The data will be packed by the microcontroller and transmitted over the air via a transmitter. Sensor nodes are made to be tiny and energy efficient in order for their batteries to last a long time.
I will continue to share on this article in the following post.
You are welcome to like and exchange in the comment area. Stay safe and Thank you!
