QAM Backscatter for Low Power RFID Data Transfer
Electrical and Computer Engineering
The goal of this project is to transmit large amounts of data passively (without the need of a battery) using low-power quadrature amplitude modulation (QAM) backscatter communication. This is the first example of a single-chip QAM backscatter communication system to date. To control data flow, a programmable microcontroller interfaces the radio frequency identification (RFID) tag. Two methods for data reception were implemented: reading data through an oscilloscope capture and reading data from a programmable software defined radio (SDR). The SDR offers greater flexibility than the oscilloscope but requires a steep initial learning curve. The chip was initially tested in a wired configuration and showed that an impedance matching network needed to be implemented to improve the signal to noise ratio (SNR). Future work on this project includes improving received SNR, running fully-passive over the air tests, and ultimately battery-free streaming video.
White, John, "QAM Backscatter for Low Power RFID Data Transfer" (2016). Symposium on Undergraduate Research and Creative Expression (SOURCE). 584.