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Construction of a Wireless-Enabled Endoscopically Implantable Sensor for pH Monitoring with Zero-Bias Schottky Diode-based Receiver
Published on: August 27, 2021
Energy efficiency and reliability in wireless biomedical implant systems.
Jamshid Abouei1, J David Brown, Konstantinos N Kostas Plataniotis
1Department of Electrical and Computer Engineering, Yazd University, Yazd 89195-741, Iran. abouei@yazduni.ac.ir
Summary
This study introduces a new protocol for wireless implant communication, enhancing energy efficiency for medical sensors. The rateless coded FSK modulation significantly reduces power consumption, improving device longevity.
Area of Science:
- Biomedical Engineering
- Wireless Communication Systems
- Implantable Medical Devices
Background:
- Wireless implant technology necessitates reliable physiological data transmission and efficient energy management in power-limited devices.
- The Medical Implant Communications Service (MICS) frequency band is crucial for implantable sensors, but signal attenuation within the human body poses challenges.
- Existing wireless sensor network standards may not be optimal for the unique demands of implantable devices.
Purpose of the Study:
- To propose an enhanced physical layer protocol for the Medical Implant Communications Service (MICS) focused on improving energy efficiency.
- To address reliability and power consumption concerns in tiny implantable sensors operating within the MICS band.
- To enable fast start-up times for transceiver circuitry in implantable devices.
Main Methods:
- The proposed protocol augments the MICS physical layer using rateless codes combined with frequency-shift keying (FSK) modulation.
- Rateless codes offer inherent adaptive duty cycling for power management due to their flexible code rate.
- The protocol was optimized for modulation and coding parameters, particularly for deep tissue applications.
Main Results:
- Analytical results show up to 80% energy savings compared to the IEEE 802.15.4 physical layer standard.
- Numerical results indicate that optimized rateless coded FSK is more energy-efficient than uncoded FSK for deep tissue applications.
- The protocol demonstrates improved reliability and power cost-effectiveness for implantable sensors.
Conclusions:
- The proposed rateless coded FSK protocol significantly enhances energy efficiency for wireless implantable devices operating in the MICS band.
- This approach effectively overcomes signal attenuation challenges in the human body, crucial for applications like digestive endoscopy.
- The protocol offers a promising solution for extending the operational life of power-constrained medical implants.
