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Enabling Ultrasound In-Body Communication: FIR Channel Models and QAM Experiments
IEEE Transactions on Biomedical Circuits and Systems
|November 13, 2018
Summary
This study introduces a new ultrasound testbed for reliable intra-body communication, overcoming limitations of current designs. The developed system achieves high data rates with low error rates, paving the way for advanced medical implants.
Area of Science:
- Biomedical Engineering
- Medical Devices
- Wireless Communication
Background:
- Electromagnetic waves face limitations for intra-body communication due to attenuation, health risks, and interference.
- Existing ultrasound communication systems are hindered by bulky transducers, simple modulation, and lack of realistic models.
Purpose of the Study:
- To develop a novel ultrasound emulation testbed for reliable intra-body communication.
- To investigate in-body communication scenarios and develop realistic channel models.
- To assess communication performance using different modulation schemes.
Main Methods:
- Construction of a static emulation testbed with small, omnidirectional transducers and custom gelatin phantoms.
- Extraction and modeling of communication channels using finite impulse response (FIR) models.
- Implementation and testing of a quadrature-amplitude modulation (QAM) modem.
Main Results:
- Established a communication link using 4-QAM at 200 kbit/s with a Bit Error Rate (BER) below 1e-4.
- Achieved identical results through computer simulations on the extracted FIR channels.
- Verified and open-sourced FIR channel models for future research.
Conclusions:
- The proposed ultrasound testbed enables reliable intra-body communication.
- The developed FIR channel models accurately represent in-body communication environments.
- The findings support the design of advanced ultrasound-based in-body communication systems.
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