# US 2023/0412253 A1 · Control apparatus and control method

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- Number: US 2023/0412253 A1
- Document ID: US20230412253A1
- Status: Published application
- Kind: A1
- Application number: 18/036,351
- Filed: 2020-11-26
- Published: 2023-12-21
- Earliest claimed: 2020-11-26
- Assignees: Nippon Telegraph and Telephone Corporation
- Applicants: Nippon Telegraph and Telephone Corporation
- Inventors: Kazumitsu SAKAMOTO; Yosuke FUJINO; Yasuyoshi KOJIMA; Daisuke GOTO; Kiyohiko ITOKAWA
- Web page: https://patentgrep.com/patent/US20230412253A1

## CPC

- H04B 7/18513: {Transmission in a satellite or space-based system}
- H04B 7/08: at the receiving station
- H04B 7/185: Space-based or airborne stations; {Stations for satellite systems}(H04B7/204 takes precedence)
- H04B 7/195: Non-synchronous stations
- H04W 16/28: using beam steering
- H04W 84/06: Airborne or Satellite Networks (space-based or airborne stations H04B7/185)
- H04B: TRANSMISSION
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

There is provided a control device of a wireless communication system including the control device that is installed on a moving object and moves, a first communication device that transmits a desired signal to the control device by a first wireless method, a second communication device that transmits an interference signal interfering with the desired signal by a second wireless method, and one or more third communication devices, the control device including: a reception unit that acquires a wireless signal including a reference signal transmitted from the third communication device in the vicinity of the second communication device by a third wireless method and a desired signal transmitted from the first communication device by the first wireless method; an extraction unit that extracts the reference signal from the wireless signal based on the third wireless method; an estimation unit that estimates a propagation channel between the third communication device and the control device based on the reference signal; and a beam control unit that directs a null of a reception beam in an arrival direction of the reference signal based on the propagation channel.

## Claims

### Claim 1

A control device of a wireless communication system including the control device that is installed on a moving object and moves, a first communication device that transmits a desired signal to the control device by a first wireless method, a second communication device that transmits an interference signal interfering with the desired signal by a second wireless method, and one or more third communication devices, the control device comprising:
a receptor that acquires a wireless signal including a reference signal transmitted from the third communication device in the vicinity of the second communication device by a third wireless method and a desired signal transmitted from the first communication device by the first wireless method;
an extractor that extracts the reference signal from the wireless signal based on the third wireless method;
an estimator that estimates a first propagation channel between the third communication device and the control device based on the reference signal; and
a beam controller that directs a null of a reception beam in an arrival direction of the reference signal based on the first propagation channel.

### Claim 2 (depends on 1)

The control device according to claim 1, wherein
the extractor extracts the desired signal from the wireless signal based on the first wireless method,
the estimator estimates a second propagation channel between the first communication device and the control device based on a known signal in the desired signal, and
the beam controller directs a reception beam in an arrival direction of the desired signal based on the second propagation channel.

### Claim 3 (depends on 1)

The control device according to claim 1, wherein
a wireless method of the desired signal, a wireless method of the interference signal, and a wireless method of the reference signal are different from each other.

### Claim 4 (depends on 1)

The control device according to claim 1, wherein
a spreading factor of the desired signal, a spreading factor of the interference signal, and a spreading factor of the reference signal are different from each other.

### Claim 5 (depends on 1)

The control device according to claim 1, wherein
the extractor extracts the reference signal from the wireless signal by despreading processing using a spreading code in the third wireless method.

### Claim 6 (depends on 1)

The control device according to claim 1, wherein
the extractor extracts the reference signals alternately transmitted from a plurality of the third communication devices.

### Claim 7

A control method executed by a control device of a wireless communication system including the control device that is installed on a moving object and moves, a first communication device that transmits a desired signal to the control device by a first wireless method, a second communication device that transmits an interference signal interfering with the desired signal by a second wireless method, and one or more third communication devices, the control method comprising:
acquiring a wireless signal including a reference signal transmitted from the third communication device in the vicinity of the second communication device by a third wireless method and a desired signal transmitted from the first communication device by the first wireless method;
extracting the reference signal from the wireless signal based on the third wireless method;
estimating a first propagation channel between the third communication device and the control device based on the reference signal; and
directing a null of a reception beam in an arrival direction of the reference signal based on the first propagation channel.