Spatiotemporal Acoustic Communication by a Single Sensor via Rotational Doppler Effect

Area of Science:

• Acoustic communication
• Information theory
• Signal processing

Background:

• Increasing transmission capacity and accuracy is a key goal in information communication.
• Multiplexing technology offers a promising solution for enhanced data transmission.
• Acoustic communication faces challenges in spatial information density and system complexity.

Purpose of the Study:

• To propose and demonstrate real-time spatiotemporal communication using a single sensor.
• To overcome limitations in acoustic communication by improving spatial information density and reducing systematic complexity.
• To leverage the rotational Doppler effect for efficient information encoding and detection.

Main Methods:

• Proposed a novel communication scheme based on the rotational Doppler effect.
• Utilized multiplexed orbital-angular-momentum (OAM) channels to carry information.
• Transformed OAM channel information into temporal harmonic waveforms for single-sensor detection.
• Experimentally demonstrated parallel transmission of complex images using eight OAM channels.

Main Results:

• Achieved real-time spatiotemporal communication with a single sensor.
• Successfully transformed multiplexed OAM channel information into detectable temporal waveforms.
• Demonstrated parallel transmission of complex images with an extremely low bit error rate (BER) below 0.02%.
• The single-sensor configuration proved independent of channel number and encoding scheme.

Conclusions:

• The proposed single-sensor spatiotemporal communication based on the rotational Doppler effect enhances acoustic communication.
• The method offers high accuracy and capacity, overcoming limitations of existing acoustic communication systems.
• The system exhibits immunity to inner-mode crosstalk and robustness to noise, showing potential for broad applications.