Granted Patent B2

US 12,388,701 · App. 18/683,780 · Granted Aug 12, 2025

Inventors: Hayato Fukuzono (Musashino, JP); Keita Kuriyama (Musashino, JP); Daisei Uchida (Musashino, JP); Masafumi Yoshioka (Musashino, JP); Toshifumi Miyagi (Musashino, JP)

Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

H04L27/38

Abstract

Claims (116)

1. A wireless communication system including a transmitter and a receiver that perform wireless communication using a single-carrier multi-value modulation scheme,

wherein the transmitter comprises

a transmission signal amplifier in which transmission power is variable and

the transmitter is configured to execute;

providing the receiver with a specification related to an input/output characteristic of the transmission signal amplifier; and

of providing the receiver with transmission power used for data transmission, and wherein

the receiver is configured to execute:

estimating a constellation of signal points on the basis of the transmission power and the specification;

detecting a reception point of a reception signal, the reception point being a point in constellation coordinates;

calculating likelihood for the reception point, with respect to the signal points; and

identifying a symbol intended by the reception point on the basis of a result of the likelihood calculation.

2. The wireless communication system according to claim 1 , wherein

the processing for estimating the constellation includes:

setting, as the constellation of the signal points, a reference constellation of the single-carrier multi-value modulation scheme in a case where the transmission power belongs to a linear region of the transmission signal amplifier; and

setting, as the constellation of the signal points, a constellation obtained by adding distortion corresponding to the transmission power and the specification to the reference constellation in a case where the transmission power belongs to a non-linear region of the transmission signal amplifier.

3. The wireless communication system according to claim 1 , wherein

the transmitter

is configured to further execute transmitting a training signal, and wherein

the receiver

stores an original value of the training signal; and

the receiver is configured to further execute;

detecting an influence of a communication path on the reception signal on the basis of a difference between the original value and a value of the training signal that has been actually received; and

eliminating the influence of the communication path from the reception point prior to the likelihood calculation.

4. The wireless communication system according to claim 3 , wherein the training signal is transmitted with power belonging to the linear region of the transmission signal amplifier.

5. The wireless communication system according to claim 1 , wherein

the receiver

is configured to further execute;

calculating an error rate of the reception signal; and

providing the error rate to the transmitter, and wherein

the transmitter

is configured to further execute

controlling the transmission power to be a maximum power with which a requirement related to the error rate is cleared.

6. The wireless communication system according to claim 5 , wherein

the processing of controlling the transmission power to be a maximum power includes:

setting the transmission power to the maximum power at a start of wireless communication;

acquiring the error rate from the receiver;

determining whether the error rate clears the requirement; and

gradually decreasing the transmission power until a result that the error rate clears the requirement is obtained.

7. A wireless communication method using a transmitter and a receiver that perform wireless communication using a single-carrier multi-value modulation scheme,

wherein the transmitter includes a transmission signal amplifier in which transmission power is variable, and

the wireless communication method includes:

providing, by the transmitter, the receiver with a specification related to an input/output characteristic of the transmission signal amplifier;

providing, by the transmitter, the receiver with transmission power used for data transmission;

estimating, by the receiver, a constellation of signal points on the basis of the transmission power and the specification;

detecting, by the receiver, a reception point of a reception signal, the reception point being a point in constellation coordinates;

calculating, by the receiver, likelihood for the reception point, with respect to the signal points; and

identifying, by the receiver, a symbol intended by the reception point on the basis of a result of the likelihood calculation.

8. A receiver for performing wireless communication using a single-carrier multi-value modulation scheme, the receiver being configured to execute:

acquiring, from a transmitter for the wireless communication, a specification related to an input/output characteristic of a transmission signal amplifier used by the transmitter;

acquiring transmission power used for data transmission by the transmitter;

estimating a constellation of signal points on the basis of the transmission power and the specification;

detecting a reception point of a reception signal, the reception point being a point in constellation coordinates;

calculating likelihood for the reception point, with respect to the signal points; and

identifying a symbol intended by the reception point on the basis of a result of the likelihood calculation.

9. The wireless communication system according to claim 2 , wherein

the transmitter is configured to further execute transmitting a training signal, and wherein

the receiver stores an original value of the training signal; and

the receiver is configured to further execute:

detecting an influence of a communication path on the reception signal on the basis of a difference between the original value and a value of the training signal that has been actually received; and

eliminating the influence of the communication path from the reception point prior to the likelihood calculation.

10. The wireless communication system according to claim 9 , wherein the training signal is transmitted with power belonging to the linear region of the transmission signal amplifier.

11. The wireless communication system according to claim 2 , wherein

the receiver is configured to further execute:

calculating an error rate of the reception signal; and

providing the error rate to the transmitter, and wherein

the transmitter is configured to further execute controlling the transmission power to be a maximum power with which a requirement related to the error rate is cleared.

12. The wireless communication system according to claim 3 , wherein

the receiver is configured to further execute:

calculating an error rate of the reception signal; and

providing the error rate to the transmitter, and wherein

the transmitter is configured to further execute controlling the transmission power to be a maximum power with which a requirement related to the error rate is cleared.

13. The wireless communication system according to claim 4 , wherein

the receiver is configured to further execute:

calculating an error rate of the reception signal; and

providing the error rate to the transmitter, and wherein

the transmitter is configured to further execute controlling the transmission power to be a maximum power with which a requirement related to the error rate is cleared.

14. The wireless communication system according to claim 9 , wherein

the receiver is configured to further execute:

calculating an error rate of the reception signal; and

providing the error rate to the transmitter, and wherein

the transmitter is configured to further execute controlling the transmission power to be a maximum power with which a requirement related to the error rate is cleared.

15. The wireless communication system according to claim 10 , wherein

the receiver is configured to further execute:

calculating an error rate of the reception signal; and

providing the error rate to the transmitter, and wherein

the transmitter is configured to further execute controlling the transmission power to be a maximum power with which a requirement related to the error rate is cleared.

16. The wireless communication system according to claim 11 , wherein

the processing of controlling the transmission power to be a maximum power includes:

setting the transmission power to the maximum power at a start of wireless communication;

acquiring the error rate from the receiver;

determining whether the error rate clears the requirement; and

gradually decreasing the transmission power until a result that the error rate clears the requirement is obtained.

17. The wireless communication system according to claim 12 , wherein

the processing of controlling the transmission power to be a maximum power includes:

setting the transmission power to the maximum power at a start of wireless communication;

acquiring the error rate from the receiver;

determining whether the error rate clears the requirement; and

gradually decreasing the transmission power until a result that the error rate clears the requirement is obtained.

18. The wireless communication system according to claim 13 , wherein

the processing of controlling the transmission power to be a maximum power includes:

setting the transmission power to the maximum power at a start of wireless communication;

acquiring the error rate from the receiver;

determining whether the error rate clears the requirement; and

gradually decreasing the transmission power until a result that the error rate clears the requirement is obtained.

19. The wireless communication system according to claim 14 , wherein

the processing of controlling the transmission power to be a maximum power includes:

setting the transmission power to the maximum power at a start of wireless communication;

acquiring the error rate from the receiver;

determining whether the error rate clears the requirement; and

gradually decreasing the transmission power until a result that the error rate clears the requirement is obtained.

20. The wireless communication system according to claim 15 , wherein

the processing of controlling the transmission power to be a maximum power includes:

setting the transmission power to the maximum power at a start of wireless communication;

acquiring the error rate from the receiver;

determining whether the error rate clears the requirement; and

gradually decreasing the transmission power until a result that the error rate clears the requirement is obtained.

Assignments (2)

Continuity (1)

References Cited (10)