US 12,309,002 B2
Methods and devices for estimating a frequency deviation
Daisuke Kimura, Ashiya (JP); and Yusuke Toyoda, Amagasaki (JP)
Assigned to FURUNO ELECTRIC COMPANY LIMITED, Hyogo (JP)
Filed by FURUNO ELECTRIC CO., LTD., Hyogo (JP)
Filed on Jul. 13, 2023, as Appl. No. 18/352,126.
Application 18/352,126 is a continuation in part of application No. PCT/JP2022/000458, filed on Jan. 11, 2022.
Claims priority of application No. 2021-021994 (JP), filed on Feb. 15, 2021.
Prior Publication US 2023/0362035 A1, Nov. 9, 2023
Int. Cl. H04B 3/46 (2015.01); H04L 25/02 (2006.01)
CPC H04L 25/0222 (2013.01) 18 Claims
OG exemplary drawing
 
1. A frequency deviation estimation device, comprising:
processing circuitry configured:
to measure an instantaneous frequency of a received communication signal;
to detect a minimum frequency of the instantaneous frequency;
to calculate a frequency deviation between the received communication signal and a reference signal for coarse adjustment, using the minimum frequency of the instantaneous frequency and a reference minimum frequency when the frequency deviation is zero Hertz;
to perform a filtering process by filtering the minimum frequency of a plurality of intervals; and
to calculate the frequency deviation using the minimum frequency filtered by the filtering process.