Data communications using guided elastic waves by time reversal pulse position modulation: experimental study.
Data communications using guided elastic waves by time reversal pulse position modulation: experimental study.
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DOI：
10.3390/s130708352
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发表时间：
2013-07-01
期刊：
影响因子：
--
通讯作者：
Zhao D
中科院分区：
文献类型：
--
作者：
Jin Y;Ying Y;Zhao D
在本文中，我们提出并证明了一种低复杂度的弹性波信号和接收方法，以实现高数据速率通信的分散固体弹性介质，如金属管道，使用压电换能器的PZT（锆钛酸铅）。采用脉冲位置调制（PPM）作为信令方式，弹性介质作为通信信道，实现数据通信。通信系统首先发射少量训练脉冲以探测色散介质。然后，时间反转的探测信号被用作携带信息的波形。利用弹性导波的互易特性，实现了弹性介质中传输波形的快速定时采集。使用National Instrument PXI系统进行波形激励和数据采集的实验测试。数据遥测比特率为10 kbps、20 kbps、50 kbps和100 kbps，平均比特差错率分别为0、5.75 x 10-4、1.09 x 10-2和5.01 x 10-2，共计40个，当在钢管试样上以250 kHz的中心频率和500 kHz的带宽发送时，获得了000个发送比特。为了强调时间反转的影响，没有采用复杂的处理技术，如自适应信道均衡或纠错编码。
In this paper, we present and demonstrate a low complexity elastic wave signaling and reception method to achieve high data rate communication on dispersive solid elastic media, such as metal pipes, using piezoelectric transducers of PZT (lead zirconate titanate). Data communication is realized using pulse position modulation (PPM) as the signaling method and the elastic medium as the communication channel. The communication system first transmits a small number of training pulses to probe the dispersive medium. The time-reversed probe signals are then utilized as the information carrying waveforms. Rapid timing acquisition of transmitted waveforms for demodulation over elastic medium is made possible by exploring the reciprocity property of guided elastic waves. The experimental tests were conducted using a National Instrument PXI system for waveform excitation and data acquisition. Data telemetry bit rates of 10 kbps, 20 kbps, 50 kbps and 100 kbps with the average bit error rates of 0, 5.75 x 10-4, 1.09 x 10-2 and 5.01 x 10-2, respectively, out of a total of 40, 000 transmitted bits were obtained when transmitting at the center frequency of 250 kHz and a 500 kHz bandwidth on steel pipe specimens. To emphasize the influence of time reversal, no complex processing techniques, such as adaptive channel equalization or error correction coding, were employed.
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