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Improving Passive Time Reversal Underwater Acoustic Communications Using Subarray Processing.

Chengbing He1, Lianyou Jing2, Rui Xi3

  • 1School of Marine Science and Technology, Northwestern Polytechnical University, Xi'an 710072, China. hcb@nwpu.edu.cn.

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Summary
This summary is machine-generated.

A new passive time reversal with multichannel decision feedback equalizer (TR-MC-DFE) improves underwater acoustic communication by enhancing spatial and temporal focusing. This method significantly reduces bit error rates and boosts signal-to-noise ratio compared to conventional techniques.

Keywords:
adaptive multichannel equalizationchannel estimationpassive time reversalunderwater acoustic communications

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Area of Science:

  • Underwater Acoustic Communications
  • Signal Processing
  • Wireless Communication

Background:

  • Multichannel receivers are crucial for high-rate underwater acoustic communication, utilizing spatial diversity.
  • Passive time reversal combined with a single-channel decision feedback equalizer (TR-DFE) offers a low-complexity solution for spatial and temporal focusing.

Purpose of the Study:

  • To introduce a novel receiver structure, the passive time reversal with a low-order multichannel adaptive decision feedback equalizer (TR-MC-DFE).
  • To enhance the performance of conventional TR-DFE systems in underwater acoustic communication.

Main Methods:

  • The proposed TR-MC-DFE divides the received array into subarrays for passive time reversal processing.
  • Subarray outputs are then equalized using a low-order multichannel DFE.
  • Channel estimation methods including LS, OMP, and IPNLMS were investigated.

Main Results:

  • The TR-MC-DFE achieved uncoded bit error rates between 1x10^-2 and 1x10^-3, outperforming the conventional TR-DFE (1x10^-1 to 2x10^-2).
  • Evaluations used simulation and real lake experiment data with QPSK signals at 8 kbits/s over 7.4 km.
  • An average output signal-to-noise ratio enhancement of 3 dB was observed compared to the conventional TR-DFE.

Conclusions:

  • The proposed TR-MC-DFE receiver structure offers superior performance in underwater acoustic communication.
  • This novel approach effectively improves both spatial and temporal focusing, leading to significant gains in BER and SNR.