Communication device, information processing method, and non-transitory computer-readable storage medium

Patent metadata

Field	Value
Publication number	US-12474458-B2
Application number	US-202318098992-A
Country	US
Kind code	B2
Filing date	Jan 19, 2023
Priority date	Feb 3, 2022
Publication date	Nov 18, 2025
Grant date	Nov 18, 2025

Abstract

A communication device comprising: a wireless communication section configured to wirelessly receive a signal from another communication device; and a control section configured to estimate a reception time of the second signal based on the expanded signal matrix that minimizes the predetermined norm, wherein the control section executes the iterative calculation separately at a plurality of stages, sets a value of the regularization parameter used for the iterative calculation at or after a second stage of the plurality of stages to a value of the regularization parameter or more used for the iterative calculation at a previous stage, and changes the value of the regularization parameter based on a reception status of the second signal during the iterative calculation at or after the second stage.

First claim

What is claimed is:

1 . A communication device comprising:
a wireless communication section configured to wirelessly receive a signal from another communication device; and a control section configured to
correlate a first signal with a second signal at a designated interval,

the second signal being a signal associated with the first signal, and being received by the wireless communication section in a case where the other communication device transmits a signal including a pulse as the first signal,
convert a data matrix into a format including a matrix product of an expanded modal matrix and an expanded signal matrix, the data matrix being a matrix obtained by arranging one or a plurality of correlation computation results that are each a result obtained by correlating the first signal with the second signal of the wireless communication section at the designated interval, the expanded modal matrix being a matrix including a plurality of elements indicating the correlation computation results obtained on an assumption that the signal is received at respective set times, the expanded signal matrix being a matrix obtained by arranging expanded signal vectors for the one or the plurality of correlation computation results, and the expanded signal vector being a vector including a plurality of elements each indicating whether or not there is the signal of the wireless communication section at each of the set times, and an amplitude and a phase of the signal,
estimate the expanded signal matrix that minimizes a predetermined norm by iterative calculation that uses a regularization parameter that is a positive infinitesimal, and
estimate a reception time of the second signal based on the expanded signal matrix that minimizes the predetermined norm,
wherein the control section executes the iterative calculation separately at a plurality of stages, sets a value of the regularization parameter used for the iterative calculation at or after a second stage of the plurality of stages to a value of the regularization parameter or more used for the iterative calculation at a previous stage, and changes the value of the regularization parameter based on a reception status of the second signal during the iterative calculation at or after the second stage, and
wherein the control section measures a distance between the communication device and the other communication device based on the reception time of the second signal.

2 . The communication device according to claim 1 ,
wherein the control section changes the value of the regularization parameter based on an interval of an incoming wave related to the second signal during the iterative calculation at or after the second stage.

3 . The communication device according to claim 2 ,
wherein the control section makes the value of the regularization parameter smaller during the iterative calculation at or after the second stage as an interval of the incoming wave related to the second signal is longer.

4 . The communication device according to claim 1 ,
wherein the control section sets the value of the regularization parameter based on signal power related to the second signal during the iterative calculation at or after the second stage.

5 . The communication device according to claim 1 ,
wherein the control section sets the value of the regularization parameter based on noise power related to the second signal during the iterative calculation at or after the second stage.

6 . The communication device according to claim 5 ,
wherein the control section sets the value of the regularization parameter based on a signal to noise ratio related to the second signal during the iterative calculation at or after the second stage.

7 . The communication device according to claim 6 ,
wherein the control section makes the value of the regularization parameter smaller during the iterative calculation at or after the second stage as the value of the signal to noise ratio related to the second signal is larger.

8 . The communication device according to claim 6 ,
wherein the control section sets the value of the regularization parameter to a first value in a case where the signal to noise ratio related to the second signal is larger than a specified value, and sets the value of the regularization parameter to a value larger than the first value in a case where the signal to noise ratio related to the second signal is the specified value or less.

9 . The communication device according to claim 5 ,
wherein the control section calculates the noise power related to the second signal according to an equation (5) during the iterative calculation,

[

Mathematical
⁢

5

]



σ

2
⁢

(
m
)

=

1
MK

⁢



Z
→

A
⁢

y
m



F
2

+

σ

2
⁢

(

m
-
1

)

M

⁢

Tr
[

G
m

Assignees

• Tokai Rika Co Ltd
• Nagoya Inst Tech

Inventors

• Oishi Yoshiki
• Koga Kenichi
• Koike Tatsuya
• Kataoka Kento
• Kikuma Nobuyoshi

Classifications

• G01S13/76

  wherein pulse-type signals are transmitted · CPC title

• G01S3/48

  the waves arriving at the antennas being continuous or intermittent and the phase difference of signals derived therefrom being measured · CPC title

• G01S13/931

  of land vehicles · CPC title

• G01S7/006

  using shared front-end circuitry, e.g. antennas (G01S13/765, G01S13/825 take precedence) · CPC title

• G01S11/08 Primary

  using synchronised clocks · CPC title