利用空间自由度实现与植入式设备的高速超声通信
Exploiting Spatial Degrees of Freedom for High Data Rate Ultrasound Communication with Implantable Devices
摘要：
我们提出并演示了一种使用空间自由度的超声波通信链路，以提高深度植入式医疗设备的数据速率。低衰减和毫米波长使超声波成为小型化低功率植入物的理想通信介质。虽然小的频谱带宽极大地限制了常规超声植入物中可实现的数据速率，但是可以通过在多输入/多输出系统中使用多个换能器来利用大的空间带宽，以提供空间复用增益，而无需额外的功率、更大的带宽或复杂的封装。我们通过实验验证了矿物油中的通信链路，发射器和接收器相距5厘米，每个外壳都有两个定制设计的毫米大小的压电换能器，以相同的频率工作。在两个信道上同时发送和接收用125 kbps的正交相移键控调制的两个数据流，有效地将数据速率加倍到250 kbps，测量的误码率低于1 e-4。我们还评估了信道分离网络的性能和鲁棒性，通过测试引入位置偏移后的通信链路。这些结果表明，空间复用的潜力，使更复杂的植入应用需要更高的数据速率。
英文摘要：
We propose and demonstrate an ultrasonic communication link using spatial degrees of freedom to increase data rates for deeply implantable medical devices. Low attenuation and millimeter wavelengths make ultrasound an ideal communication medium for miniaturized low-power implants. While small spectral bandwidth has drastically limited achievable data rates in conventional ultrasonic implants, large spatial bandwidth can be exploited by using multiple transducers in a multiple-input/multiple-output system to provide spatial multiplexing gain without additional power, larger bandwidth, or complicated packaging. We experimentally verify the communication link in mineral oil with a transmitter and receiver 5 cm apart, each housing two custom-designed mm-sized piezoelectric transducers operating at the same frequency. Two streams of data modulated with quadrature phase-shift keying at 125 kbps are simultaneously transmitted and received on both channels, effectively doubling the data rate to 250 kbps with a measured bit error rate below 1e-4. We also evaluate the performance and robustness of the channel separation network by testing the communication link after introducing position offsets. These results demonstrate the potential of spatial multiplexing to enable more complex implant applications requiring higher data rates.
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