研究目的
Design and implementation of an analog front-end transceiver circuit for a patient monitoring system using optical wireless communication, focusing on wearable, portable devices with bidirectional links.
研究成果
The AFE transceiver module for wearable patient monitoring has been successfully designed and implemented, supporting bidirectional optical links with VLC and IR communication. It achieves a bandwidth of 2190 Hz for VLC and 1500 Hz for IR, with an optical distance of up to 2.5 meters at zero angle, making it suitable for portable, low-complexity healthcare applications.
研究不足
The AFE transceiver circuit is designed for indoor use with lower ambient light conditions and cannot guarantee performance under intense sunlight illumination. The system has limited bandwidth (up to 25 KHz for VLC and 1500 Hz for IR) and optical distance (up to 2.5 meters with 0-degree angle).
1：Experimental Design and Method Selection:
The study involves designing and implementing an analog front-end (AFE) module for optical wireless communication (OWC) in a patient monitoring system, using visible light for downlink and IR for uplink. Theoretical models include line-of-sight (LoS) propagation and circuit design for amplifiers, filters, and modulators.
2：Sample Selection and Data Sources:
The system is designed for indoor healthcare environments, with simulations and hardware tests conducted in a 2m x 2m room area.
3：List of Experimental Equipment and Materials:
Includes components such as LEDs, photodiodes, transistors, op-amps, microcontrollers (e.g., STM32 Nucleo-64), batteries, and PCBs. Specific models are XC-10W-C LED, SP-8ML KODENSI photodiode, IRF510 MOSFET, PN2222 BJT, LM358 op-amp, LM139 comparator, TDA2030 op-amp, and TSOP1738 IR receiver.
4：Experimental Procedures and Operational Workflow:
Steps include circuit design and simulation (e.g., using MATLAB for luminosity distribution), PCB fabrication, hardware assembly, testing of LED drivers and receivers, bandwidth measurement, and distance tests with varying frequencies and angles.
5：Data Analysis Methods:
Analysis involves measuring output signals, bandwidth, and optical distance using oscilloscopes and signal generators, with calculations based on electrical and optical equations.
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LED
XC-10W-C
Used as a light source for visible light communication downlink.
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Photodiode
SP-8ML
KODENSI
Converts visible light signals to electric signals in the VLC receiver.
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Transistor
PN2222
Used in common emitter amplifier for current control.
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MOSFET
IRF510
Acts as a power amplifier in the LED driver circuit.
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Op-Amp
LM358
Used in various amplifier and filter circuits.
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Comparator
LM139
Converts analog signals to digital signals in the comparator circuit.
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Op-Amp
TDA2030
Used in the split supply circuit as a buffer for voltage division.
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IR Receiver
TSOP1738
Demodulates IR signals into digital signals for uplink communication.
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Microcontroller
STM32 Nucleo-64
Serves as the processing unit in the patient device, interfacing with the AFE module.
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Battery
Li-ion
Powers the patient device for portability.
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