利用自适应时间反转消除串扰。

Crosstalk mitigation using adaptive time reversal.

机构信息

Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California 92093-0238, USA.

出版信息

J Acoust Soc Am. 2010 Feb;127(2):EL19-22. doi: 10.1121/1.3280234.

PMID:20136173

Abstract

Although the spatial focusing property of the conventional time reversal approach facilitates multiuser communications, there always is residual crosstalk between users. A recent paper [Kim and Shin, J. Acoust. Soc. Am. 115, 600-606 (2004)] proposed an adaptive active time reversal approach for simultaneous multiple focusing with minimal interference. This letter applies the adaptive approach to passive time reversal, multiuser communications for additional suppression of crosstalk among users. Experimental data at 3.5 kHz with a 1-kHz bandwidth demonstrate as much as 6.5-dB improvement per user in terms of output signal-to-noise ratio for three-user communications over a 20-km range in 120-m deep shallow water.

摘要

尽管传统的时间反转方法的空间聚焦特性有利于多用户通信，但用户之间始终存在残余串扰。最近的一篇论文[Kim 和 Shin, J. Acoust. Soc. Am. 115, 600-606 (2004)]提出了一种自适应主动时间反转方法，用于同时进行最小干扰的多个焦点。本信将自适应方法应用于被动时间反转，用于多用户通信，以进一步抑制用户之间的串扰。在 3.5 kHz 带宽下，在 120 米深的浅水中进行 20 公里范围的三用户通信时，实验数据表明，每个用户的输出信噪比提高了 6.5 dB。