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首页> 外文会议>Information Sciences and Systems, 2009. CISS 2009 >High bit rate ultrasonic communication through metal channels
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High bit rate ultrasonic communication through metal channels

机译：通过金属通道进行高比特率超声波通信

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As low cost, low power wireless networking technologies continue to gain popularity in industrial control and remote sensing applications, greater demand is being placed on network reliability and robustness. The numerous metallic objects found in many industrial environments can make reliable RF coverage difficult to obtain. In cases where system components are physically isolated from one another by metallic barriers (e.g. bulkheads or storage tank walls), direct RF communication between components is not possible. Prior research into the use of ultrasonic signaling as a means of passing data across metallic barriers has proven successful, but it has been observed that acoustic echoing in the channel leads to significant intersymbol interference (ISI) when symbol rate approaches the hundred kilosymbol/second range. An echo cancelation technique was developed to partially suppress these echoes, but its performance was limited due to simplicity of the channel model used. In this paper, we develop a more accurate channel model and use it as the basis for constructing an improved echo cancelation pulse. The new pulse suppresses echoes to a level comparable to the RMS noise amplitude of the channel, greatly reducing ISI. The resulting transceiver is capable of transmitting data at over 5 Mbps using simple pulse amplitude modulation (PAM). This technique thus represents a data rate increase by a factor of five over prior work.
机译：随着低成本，低功耗无线网络技术在工业控制和遥感应用中继续普及，对网络可靠性和鲁棒性提出了更高的要求。在许多工业环境中发现的众多金属物体可能使难以获得可靠的RF覆盖范围。如果系统组件之间通过金属屏障（例如，隔板或储罐壁）彼此物理隔离，则组件之间无法直接进行RF通信。先前对使用超声波信号作为在金属屏障之间传递数据的手段的研究已被证明是成功的，但是已经观察到，当符号率接近百公里/秒范围时，通道中的声学回声会导致严重的符号间干扰（ISI）。 。已经开发了回声消除技术来部分抑制这些回声，但是由于所使用的信道模型的简单性，其性能受到了限制。在本文中，我们开发了一个更精确的通道模型，并将其用作构建改进的回声消除脉冲的基础。新脉冲将回声抑制到与通道的RMS噪声幅度相当的水平，从而大大降低了ISI。最终的收发器能够使用简单的脉冲幅度调制（PAM）以超过5 Mbps的速率传输数据。因此，该技术表示数据速率比以前的工作提高了五倍。

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