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Indoor Airborne Ultrasonic Wireless Communication Using OFDM Methods.

Wentao Jiang, William M D Wright

    IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
    |July 15, 2017
    PubMed
    Summary

    Airborne ultrasound offers a secure, short-range wireless communication alternative to radio frequency (RF) transmissions. This study demonstrates high data rates using ultrasonic transducers and advanced modulation, enhancing indoor data security.

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    Area of Science:

    • Acoustics and Signal Processing
    • Wireless Communication Technologies
    • Data Security

    Background:

    • Radio frequency (RF) wireless transmissions raise safety and data security concerns, including signal interception.
    • Airborne ultrasound presents a viable alternative for secure indoor wireless communication due to signal confinement.
    • Existing RF systems face limitations in secure, short-range data transmission.

    Purpose of the Study:

    • To implement and evaluate an indoor airborne wireless communication system using ultrasonic transducers.
    • To explore the feasibility of using ultrasound for secure data transmission as an alternative to RF.
    • To achieve high data rates and extended transmission ranges using ultrasonic signals.

    Main Methods:

    • Utilized two types of air-coupled capacitive ultrasonic transducers: commercial (50 kHz) and prototype (200-400 kHz).
    • Implemented modulation schemes including Binary Phase-Shift Keying (BPSK), Quadrature Phase-Shift Keying (QPSK), and Quadrature Amplitude Modulation (QAM)-based orthogonal frequency division multiplexing.
    • Employed a least-squares channel estimation algorithm for phase and amplitude distortion compensation.

    Main Results:

    • Achieved a maximum data rate of 180 kb/s with 16-QAM over 6 m using commercial transducers.
    • Extended transmission range to 11 m (BPSK) and 9 m (QPSK) with data rates of 45 kb/s and 90 kb/s, respectively.
    • Attained up to 800 kb/s with prototype transducers over 0.7 m, extending to 1.2 m (BPSK) and 1.1 m (QPSK) at lower rates.

    Conclusions:

    • Airborne ultrasound is a promising technology for secure, high-speed indoor wireless communication.
    • Advanced modulation techniques and channel estimation enable robust ultrasonic data transmission.
    • Ultrasonic systems offer a secure alternative to RF, mitigating risks of remote signal interception.