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A Multilevel Synchronized Optical Pulsed Modulation for High Efficiency Biotelemetry.

Guido Di Patrizio Stanchieri, Andrea De Marcellis, Graziano Battisti

    IEEE Transactions on Biomedical Circuits and Systems
    |September 26, 2022
    PubMed
    Summary

    This study introduces a new multilevel synchronized pulse position modulation for efficient optical biotelemetry, crucial for implantable devices. The technique boosts data rates while reducing power consumption, achieving 120 Mbps with low error rates.

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    Area of Science:

    • Biomedical Engineering
    • Optical Communications
    • Signal Processing

    Background:

    • Developing efficient and low-power optical biotelemetry is critical for advanced implantable and wearable medical devices.
    • Existing data transmission methods often face limitations in balancing data rate, power consumption, and reliability.
    • Novel modulation techniques are needed to enhance the performance of optical biotelemetry systems.

    Observation:

    • A novel multilevel synchronized pulse position modulation (SPPM) paradigm was designed and implemented.
    • The SPPM technique integrates multiple bits per symbol and a reference clock signal for efficient data decoding.
    • A prototype system using 500 ps laser pulses on an FPGA board was developed and tested.

    Findings:

    • The system successfully transmitted symbols composed of 3 and 4 bits at data rates of 120 Mbps.

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  • Operating at 40 Mega symbols/second (3 bits/symbol) and 30 Mega symbols/second (4 bits/symbol), the bit error rate (BER) was below 10-10.
  • Power consumption was measured at 1.95 mW and 1.8 mW, yielding energy efficiencies of 16.25 pJ/bit and 15 pJ/bit, respectively.

    • Implications:

    • This high-efficiency optical biotelemetry modulation offers a promising solution for next-generation medical implants and wearables.
    • The reduced power consumption and high data rates are key advancements for device longevity and functionality.
    • The demonstrated BER performance ensures reliable data transmission for critical biomedical applications.