A New Method of Secure Authentication Based on Electromagnetic Signatures of Chipless RFID Tags and Machine Learning Approaches

. 2020 Nov 9;20(21):6385. doi: 10.3390/s20216385

Algorithm A1: SGD Algorithm

\begin{array}{l} g_{t} \leftarrow \nabla_{θ_{t - 1}} f (θ_{t - 1}) \\ θ_{t} \leftarrow θ_{t - 1} - η g_{t} \end{array}