Patent ID: 11864141
Assignee: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY
Field: Digital communication (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A wireless communication system that performs mutual wireless communication between terminals to perform time difference measurement and propagation time measurement, the wireless communication system comprising:
a first terminal and a second terminal that transmit a signal at least once in attempting space-time synchronization,
wherein:
the first terminal measures a reception phase φAA of a signal that the first terminal itself has transmitted, and a reception phase φBA of a signal that the second terminal has transmitted, adds a positive or negative phase Δφ to at least one of the reception phase φAA and the reception phase φBA that have been measured, and reports at least one of the reception phase φAA and the reception phase φBA to the second terminal,
the second terminal measures a reception phase φBB of a signal that the second terminal itself has transmitted, and a reception phase φAB of a signal that the first terminal has transmitted, and reports, to the first terminal, the reception phase φBB and the reception phase φAB that have been measured, and
the first terminal and the second terminal further obtain a time difference or a propagation time between the first terminal and the second terminal in accordance with a reception phase that has been measured by a local device or has been reported from a counterpart, and obtain information based on a phase Δφ that has been reflected in the time difference or the propagation time that has been obtained.