Theoretical Evaluation of the Performance of Ambient LoRa Backscatter Communication

In the search of low power communication technology for future battery-free device and IoT, ambient backscatter communication is a promising solution. To this end, this work aims to analyze theoretically the performance of ambient backscatter system using LoRa transmission as an excitation signal. The tag data are encoded using FSK modulation, and at the receiver side, the quadrature demolator is used to generate the baseband signal and a correlator demodulator combined with a square law detection is used to decode the tag data. A theoretical BER calculation is provided using the numerical computation of the approximated union band equation and show a good performance of LoRa backscatter over the bi-static backscatter configuration for SNR values comprise between 2db and 9dB.