Power-Efficient Impedance-Modulation Wireless Data Links for Biomedical Implants
Power-Efficient Impedance-Modulation Wireless Data Links for Biomedical Implants
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DOI：
10.1109/tbcas.2008.2005295
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发表时间：
2008-12-01
影响因子：
5.1
通讯作者：
Sarpeshkar, Rahul
中科院分区：
文献类型：
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作者：
Mandal, Soumyajit;Sarpeshkar, Rahul
我们分析了植入式生物医学系统的无线数据遥测链路的性能。描述了一种在植入系统和外部收发信机之间使用近场电感耦合的双向半双工链路的实验实现。我们的系统通过使用阻抗调制在上行链路方向上传输高带宽信息，即从植入系统到外部系统，将植入系统的功耗降至最低。我们在误码率(BER)为<；10(-6)的情况下测量了2.8 Mbps的数据速率(我们无法测量低于10(-6)的误码率)，在BER为10(-3)时测量了4.0 Mbps的数据速率。实验结果还表明，在相反的方向，即下行链路方向，数据传输速率高达300kbps。我们还对误码率性能进行了理论分析。从理论上预测了阻抗调制固有的关于上升沿和下降沿不对称的重要影响，并通过实验证实了这一点。该链路在外部系统中的功耗为2.5 mW，在植入系统中的功耗仅为100微瓦，是已报道的最省电的感应数据链路之一。我们的链接符合FCC关于辐射排放的规定。
We analyze the performance of wireless data telemetry links for implanted biomedical systems. An experimental realization of a bidirectional half-duplex link that uses near-field inductive coupling between the implanted system and an external transceiver is described. Our system minimizes power consumption in the implanted system by using impedance modulation to transmit high-bandwidth information in the uplink direction, i.e., from the implanted to the external system. We measured a data rate of 2.8 Mbps at a bit error rate (BER) of < 10(-6) (we could not measure error rates below 10(-6)) and a data rate of 4.0 Mbps at a BER of 10(-3). Experimental results also demonstrate data transfer rates up to 300 kbps in the opposite, i.e., downlink direction. We also perform a theoretical analysis of the bit error rate performance. An important effect regarding the asymmetry of rising and falling edges that is inherent to impedance modulation is predicted by theory and confirmed by experiment. The link dissipates 2.5 mW in the external system and only 100 mu W in the implanted system, making it among the most power-efficient inductive data links reported. Our link is compatible with FCC regulations on radiated emissions.