17.6 A Sub-40μW 5Mb/s Magnetic Human Body Communication Transceiver Demonstrating Trans-Body Delivery of High-Fidelity Audio to a Wearable In-Ear Headphone
17.6 A Sub-40μW 5Mb/s Magnetic Human Body Communication Transceiver Demonstrating Trans-Body Delivery of High-Fidelity Audio to a Wearable In-Ear Headphone
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17.6 低于 40μW 5Mb/s 磁性人体通信收发器演示高保真音频跨体传送至可穿戴入耳式耳机
DOI：
10.1109/isscc.2019.8662387
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
P. Mercier
中科院分区：
文献类型：
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作者：
Jiwoong Park;P. Mercier
新兴的可穿戴设备，如无线耳机、智能眼镜和医疗监护仪，需要越来越高的吞吐量和超低功耗的无线通信。由于远场RF在人体周围具有显著的路径损耗（例如，在2.4GHz处高达70 dB），大多数RF体域网（BAN）系统（诸如低功耗蓝牙（BLE））具有消耗毫瓦功率的显著的能量昂贵的放大要求，并且因此不能满足新兴的小型设备的能量需求。例如，流行的无线耳塞只能实现几个小时的电池寿命。令人恼火的是，新兴的高保真流媒体音频和视频内容需要比BLE目前所能容纳的更高的数据速率。人体通信（HBC）系统，例如基于电场的系统（eHBC），理论上具有较低的路径损耗，因此可以提供更有效的链路[1]，[2]。然而，来自形状因子精确原型的测量揭示了仍然相当大的路径损耗（例如，在20 cm范围内为30至45 dB [3]），不幸的是，随着姿势和环境的变化，需要昂贵的能量补偿。由于人体是磁惰性的，磁性HBC（mHBC）系统，如图17.6.1所示，提供了低得多的路径损耗（例如，5- 30 dB（1 m）[4]），而没有严重的变化，因此理论上可以实现较低的通信能量。然而，迄今为止，还没有开发出任何mHBC收发器（TRX）来利用这种固有的高效通信通道，如果有的话，所采用线圈的高Q值将把直接方法的数据速率限制在<800 kb/s。
Emerging wearable devices such as wireless headphones, smart glasses, and medical monitors require increasingly high-throughput wireless communications at ultra-low-power. Since far-field RF has significant path loss around the human body (e.g., up to 70dB at 2.4GHz), most RF body-area-network (BAN) systems such as Bluetooth Low Energy (BLE) have significant energy-expensive amplification requirements consuming milliwatts of power, and thus do not meet the energy demands of emerging small devices. Popular wireless earbuds, for example, only achieve a battery life of a few hours. Exasperatingly, emerging high-fidelity streaming audio and video content requires higher data rates than what BLE can currently accommodate. Human body communication (HBC) systems, for example ones based on electric fields (eHBC), in theory have lower path loss and can thus potentially offer more efficient links [1], [2]. However, measurements from form-factor-accurate prototypes reveal path loss that is still rather large (e.g., 30-to-45dB across 20cm [3]), with unfortunately severe variation with posture and environments that requires energy-expensive compensation. Since the human body is magnetically inert, magnetic HBC (mHBC) systems, illustrated in Fig. 17.6.1, offer much lower path loss (e.g., 5-to-30dB over 1m [4]) without severe variation, and can thus theoretically achieve lower communication energy. However, to date there has not been any mHBC transceiver (TRX) developed to exploit this inherently efficient communication channel, and if there were, the high Q of employed coils would limit data rate of a straightforward approach to <800 kb/s.
采用时域信号干扰分离的 6.3pJ/b 30Mbps – 30dB SIR 耐受宽带抗干扰人体通信收发器
DOI：
10.1109/cicc.2018.8357033
发表时间：
2018
期刊：
2018 IEEE Custom Integrated Circuits Conference (CICC
影响因子：
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作者：
Maity, Shovan;Chatterjee, Baibhab;Chang, Gregory;Sen, Shreyas
通讯作者：
Sen, Shreyas