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Multichannel time-reversal processing for acoustic communications in a highly reverberant environment
James V Candy1, Andrew J Poggio, David H Chambers
1University of California, Lawrence Livermore National Laboratory, PO. Box 808, Livermore, California 94551, USA. candy1@llnl.gov
The Journal of the Acoustical Society of America
|November 4, 2005
Summary
This study introduces time-reversal (T/R) receivers for array-to-point communications in challenging environments. These T/R systems effectively mitigate signal distortion and achieve error-free data transmission using a novel 1-bit design.
Area of Science:
- Signal Processing
- Acoustic Communications
- Information Theory
Background:
- Time-reversal (T/R) techniques are emerging for robust communication in adverse environments.
- T/R mitigates signal dispersion and multipath effects by time-reversing channel characteristics.
- Existing T/R systems primarily focus on point-to-point communication.
Purpose of the Study:
- Extend time-reversal communication from point-to-point to array-to-point systems.
- Develop and analyze novel T/R receiver architectures for multichannel environments.
- Investigate the feasibility of implementing T/R receivers with low-resolution analog-to-digital converters.
Main Methods:
- Established theoretical framework for multichannel T/R communication.
- Developed and implemented various T/R receiver designs.
- Conducted proof-of-principle acoustic communication experiments in air using microphone arrays.
Main Results:
- Demonstrated effective performance of T/R receivers in hostile acoustic environments.
- Showcased that T/R receivers can be realized using a "1 bit" analog-to-digital converter structure.
- Achieved zero-bit error in extracting transmitted sequences from noisy array measurements.
Conclusions:
- Array-to-point T/R communication systems offer robust performance in challenging conditions.
- The "1 bit" ADC implementation enables efficient and high-performance T/R receivers.
- Experimental validation confirms the practical viability of T/R for reliable acoustic data transmission.