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An Indoor Airborne Ultrasonic Wireless Communication Network
Summary
This study demonstrates a practical airborne ultrasonic communication network for indoor wireless applications. The system achieves high data rates and robust handover, paving the way for efficient ultrasonic data transfer.
Area of Science:
- Acoustics
- Wireless Communication
- Signal Processing
Background:
- Growing demand for indoor wireless communication solutions.
- Limitations of existing wireless technologies in certain environments.
- Potential of airborne ultrasound for data transmission.
Purpose of the Study:
- To implement and evaluate a prototype airborne ultrasonic communication network.
- To optimize modulation schemes and data transfer rates.
- To develop a robust handover mechanism for mobile users.
Main Methods:
- Utilized commercially available capacitive ultrasonic transducers operating at 50 kHz.
- Implemented an asynchronous ultrasonic location technique with Gold code-modulated ranging signals.
- Employed 16-quadrature amplitude modulation (QAM) and quadrature phase-shift keying (QPSK) based on orthogonal frequency division multiplexing (OFDM).
Main Results:
- Achieved uplink data transfer rates of 36.1 kb/s (16-QAM-OFDM) and 18.1 kb/s (QPSK-OFDM).
- Demonstrated successful automatic handover between cell regions.
- Proposed a robust handover technique using received signal strength with hysteresis.
Conclusions:
- The prototype airborne ultrasonic network is a viable solution for indoor wireless communication.
- Optimized modulation schemes provide efficient data transfer and extended range.
- The proposed handover technique enhances system efficiency for multiple mobile receivers.
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