公开(公告)号：US11979346B2

公开(公告)日：2024-05-07

申请号：US17557903

申请日：2021-12-21

Applicant: Kamstrup A/S

Inventor： Flemming Hald ,  Jeppe Hofni ,  Mathias Rønholt Kielgast ,  Torben Markussen

IPC: H04L5/00 ,  H04W72/0446 ,  H04W72/21

CPC classification number: H04L5/0046 ,  H04L5/0053 ,  H04W72/0446 ,  H04W72/21

Abstract: A wireless communication link management method includes sending data in a primary uplink data frame from the measuring device (7) to the data collection unit (5) via a primary channel. After sending, the measuring device provides a time-limited primary access opportunity (AO) for receiving a link management downlink frame. A primary signal quality is evaluated. A secondary uplink frame is sent from the measuring device via a secondary channel. A time-limited secondary access opportunity for receiving a link management downlink frame is provided. Secondary signal qualities are evaluated. One among the primary access opportunity and the secondary access opportunities is selected for sending a link management downlink frame from the data collection unit to the measuring device depending on the signal qualities. The associated channel is used as the primary channel for sending data in a primary uplink data frame from the measuring device to the data collection unit.

公开(公告)号：US11817990B2

公开(公告)日：2023-11-14

申请号：US17613991

申请日：2020-05-27

Applicant: Kamstrup A/S

Inventor： Alex Birklykke ,  Mathias Rønholt Kielgast

IPC: H04L27/26 ,  H04L7/00

CPC classification number: H04L27/2656 ,  H04L7/0079

Abstract: A method for detecting a constant envelope burst-mode radio frequency (RF) signal with a known periodic synchronization sequence (PSS) represented therein includes transforming an incoming RF signal into a digital baseband signal (DBS), and processing the phase domain part by: 1) applying a correlation algorithm to correlate the DBS with a synchronization pattern corresponding to the PSS, 2) filtering the resulting correlation signal for removing at least a DC component of the correlation signal, 3) down-sampling the filtered correlation signal with a sampling time controlled by a clock aligned with amplitude peaks in the filtered correlation signal, 4) performing a decision algorithm on the down-sampled signal to determine if PSS is present in the incoming RF signal, then 5) generating an output signal indicating if the known PSS is present in the incoming RF signal, in response to a result of the decision algorithm.