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Superposed pulse amplitude modulation for visible light communication.

J F Li, Z T Huang, R Q Zhang

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    Summary
    This summary is machine-generated.

    We introduce Superposed Pulse Amplitude Modulation (SPAM), a new, low-cost method for light-based communication. This technique achieves a 120 Mbit/s data rate, overcoming LED non-linearity challenges.

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    Area of Science:

    • Optical Communications
    • Solid-State Lighting

    Background:

    • Non-linearity in Light Emitting Diodes (LEDs) poses challenges for high-speed optical communication.
    • Existing modulation schemes can be sensitive to these non-linear effects, limiting data rates.

    Purpose of the Study:

    • To propose and demonstrate a novel, cost-effective modulation scheme for LED-based optical communication.
    • To develop a method that is insensitive to LED non-linearity and enhances data transmission rates.

    Main Methods:

    • Developed Superposed Pulse Amplitude Modulation (SPAM).
    • Utilized an LED array where multiple optical pulses transmit in parallel from different spatial positions.
    • Employed linear superposition of optical pulses in free space.
    • Incorporated an optical blue filter and Resistor-Capacitor (RC) post-equalization.

    Main Results:

    • Achieved a data rate of 120 Mbit/s.
    • Maintained a Bit Error Rate (BER) of 1 × 10(-3).
    • Demonstrated the scheme's robustness against LED non-linearity.

    Conclusions:

    • SPAM is a viable and effective modulation technique for high-speed, low-cost optical wireless communication.
    • The proposed method overcomes limitations associated with LED non-linearity.
    • Experimental validation confirms the potential of SPAM for practical applications.