公开(公告)号：US20240413964A1

公开(公告)日：2024-12-12

申请号：US18680218

申请日：2024-05-31

Applicant: Kamstrup A/S

Inventor： Alex BIRKLYKKE ,  Jesper Torsvik TOFT

IPC: H04L7/00 ,  H04Q9/00

Abstract: A radio communication method involves utility meters installed at distributed installation locations with a data receiver. Data is received from the utility meters. Data is modulated on a received signal having a time-varying phase offset. Decision-directed phase tracking compensates for the time-varying phase offset. The compensated received signal is coherently demodulated to extract data. Extracted data is modulated to reconstruct a replica of the received signal. A phase offset prediction error—comparison between compensated received signal and the replica—and a phase offset prediction error covariance-divergence of compensated received signal and reference value and/or of phase offset prediction error and error reference value—are estimated and input into a Kalman filter. A Kalman filter output provides a prediction of time-varying phase offset in a feedback loop to compensate time-varying phase offset of received signal before compensated received signal is coherently demodulated to extract data.