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High Bit Rate Ultrasonic Communication through Metal Channels

机译：通过金属通道的高比特率超声通信

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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：由于低成本，低功耗无线网络技术在工业控制和遥感应用中继续获得普及，因此正在对网络可靠性和鲁棒性进行更大的需求。许多工业环境中发现的许多金属物体可以使得可靠的RF覆盖范围难以获得。在通过金属屏障（例如舱壁或储罐壁）彼此彼此物理隔离的情况下，不可能直接RF通信。在使用超声信号传导的情况下，以金属屏障通过数据的方法已经证明是成功的，但已经观察到当符号率接近百千单晶博中/秒范围时，通道中的声学回声导致显着的Intersymbol干扰（ISI） 。开发了一种回声消除技术以部分抑制这些回波，但由于所用通道模型的简单性，其性能受到限制。在本文中，我们开发了更准确的频道模型，并将其用作构造改进的回声消除脉冲的基础。新脉冲抑制了与信道的RMS噪声幅度相当的电平的回波，大大减少了ISI。得到的收发器能够使用简单的脉冲幅度调制（PAM）在超过5Mbps上传输数据。因此，该技术代表数据速率在前后工作超过五倍。

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