公开(公告)号：US20220345340A1

公开(公告)日：2022-10-27

申请号：US17162056

申请日：2021-01-29

Applicant: THE REGENTS OF THE UNIVERSITY OF MICHIGAN

Inventor： Hun-Seok KIM ,  Chin-Wei HSU ,  David T. BLAAUW ,  Benjamin KEMPKE

IPC: H04L27/00

Abstract: When the ultra-low power mm-scale sensor node does not have a crystal oscillator and phase-lock loop, it inevitably exhibits significant carrier frequency offset (CFO) and sampling frequency offset (SFO) with respect to the reference frequencies in the gateway. This disclosure enables efficient real-time calculation of accurate SFO and CFO at the gateway, thus the ultra-low power mm-scale sensor node can be realized without a costly and bulky clock reference crystal and also power-hungry phase lock loop. In the proposed system, the crystal-less sensor starts transmission with repetitive RF pulses with a constant interval, followed by the data payload using pulse-position modulation (PPM). A proposed algorithm uses a two-dimensional (2D) fast Fourier transform (FFT) based process that identifies the SFO and CFO at the same time to establish successful wireless communication between the gateway and crystal-less sensor nodes.