Department of Engineering and Aviation Sciences, University of Maryland Eastern Shore, Princess Anne, MD 21853, USA.
Sensors (Basel). 2013 Jul 1;13(7):8352-76. doi: 10.3390/s130708352.
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 × 10(-4), 1.09 × 10(-2) and 5.01 × 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.
在本文中，我们提出并演示了一种低复杂度的弹性波信号传输和接收方法，旨在利用 PZT（锆钛酸铅）等压电换能器在分散的固体弹性介质（如金属管）上实现高速数据通信。数据通信采用脉冲位置调制（PPM）作为信号传输方式，弹性介质作为通信信道。该通信系统首先发送少量训练脉冲以探测分散介质。然后，利用时反探测信号作为承载信息的波形。通过探索导波的互易性，可以实现弹性介质上传输波形的快速定时获取，用于解调。实验测试使用 National Instrument PXI 系统进行波形激励和数据采集。在钢质管试件上以中心频率 250 kHz 和带宽 500 kHz 发送时，总共发送了 40000 个比特，得到了 10 kbps、20 kbps、50 kbps 和 100 kbps 的数据遥测比特率，平均误码率分别为 0、5.75×10(-4)、1.09×10(-2)和 5.01×10(-2)。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。
