Ultrasonic Backscatter Communication for Implantable Medical Devices

This paper proposes an ultrasonic backscatter communication (UsBC) system for passive implantable medical devices (IMDs) that can operate without batteries, enabling versatile revolutionary applications future healthcare. The proposed UsBC consists of a reader and tag. sends interrogation pulses to the tag backscatters based on piezoelectric effect piezo transducer. We present several basic modulation schemes by impedance matching To mitigate interference other scatters in human body, transmits information bits codeword mapping, performs before energy detection reader. further derive theoretical bit-error rate (BER) expression. Monte Carlo simulations verify analysis show achieve low BER complexity, which is desirable size- energy-constrained IMDs.