An interference-resilient body channel transceiver for wearable body sensor network

This work deals with a reliability issue of the body channel communication which uses the human body as a signal transmission medium. Due to the body antenna effect, lots of electromagnetic signals are coupled to the on-body receiver, degrading the SIR significantly. In order to reject the in-band interferences, an adaptive frequency hopping scheme using variable sub-channels is proposed. The use of dual frequency synthesizers for frequency hopping improves the data throughput and the acquisition time of the transceiver by eliminating the blank time overhead. The AFH transceiver realized with 0.18 mum CMOS process sustains 1.25 Mb/s throughput when the 10 interferences causing -25 dB SIR exist.