Frequency-Division Multiplexed Magnetic Induction Based Wireless Wearable Sensor Network for Real-Time Motion Tracking

A network of wearable, wireless sensor nodes is proposed for 3D real-time motion tracking using frequency-division-multiplexed magnetic induction (MI) to extract spatial information based on measured node-to-node coupling. A custom MI transceiver chip is designed and fabricated in 180nm CMOS, which drives a wearable coil and measures tones transmitted by other nodes concurrently in full-duplex. Practical experiments are demonstrated on a 3D-printed double-joint leg model and a human subject, demonstrating fully wireless MI-based motion tracking for the first time.