Cooperative wireless device and program for same

1 . A cooperative wireless device that is a base station and that generates a carrier wave whose synchronization in frequency and time with other carrier waves generated by other cooperative wireless devices, that are other base stations, is established using a wireless two-way time synchronization technology, the cooperative wireless device comprising:

a controller; and

a transmitter, wherein

the controller is configured to:

estimate a radio wave propagation characteristic between a receiving device and the cooperative wireless device based on a training signal received over an uplink from the receiving device to the cooperative wireless device, the receiving device being a terminal;

compensate data to be transmitted over a downlink from the cooperative wireless device to the receiving device with phase rotation of a radio-wave propagation path indicated by the radio wave propagation characteristic; and

determine whether to participate in cooperative wireless communication by:

threshold processing of a time difference between the cooperative wireless device and one master cooperative wireless device that has been selected in advance from among the other cooperative wireless devices; and

threshold processing of received power of the training signal, and

the transmitter is configured to transmit the data that has been compensated by the compensation part controller to the receiving device over the downlink in response to the controller determining to participate in the cooperative wireless communication.

2 . The cooperative wireless device according to claim 1 , wherein

the controller is configured to:

measure a delay time with the training signal; and

delay the data that has been compensated by the controller according to the delay time that has been measured by the controller, and

the transmitter is configured to transmit the data that has been delayed by the controller to the receiving device.

3 . The cooperative wireless device according to claim 1 , wherein the controller is configured to:

preset a reference training signal that has not been affected by the radio wave propagation characteristic; and

estimate the radio wave propagation characteristic based on a ratio between the training signal that has been affected by the radio wave propagation characteristic and the reference training signal.

4 . The cooperative wireless device according to claim 1 , wherein

the wireless two-way time synchronization technology is wireless two-way interferometry.

5 . The cooperative wireless device according to claim 1 , wherein

the controller is configured to determine not to participate in the cooperative wireless communication when the time difference between the cooperative wireless device and the master cooperative wireless device is greater than or equal to a predetermined first threshold or when the received power of the training signal is less than a predetermined second threshold.

6 . A non-transitory storage medium storing a program for causing a computer to function as a cooperative wireless device that is a base station and that generates a carrier wave whose synchronization in frequency and time with other carrier waves generated by other cooperative wireless devices, that are other base stations, is established using a wireless two-way time synchronization technology, the cooperative wireless device comprising:

a controller; and

a transmitter, wherein

the controller is configured to:

estimate a radio wave propagation characteristic between a receiving device and the cooperative wireless device based on a training signal received over an uplink from the receiving device to the cooperative wireless device, the receiving device being a terminal;

compensate data to be transmitted over a downlink from the cooperative wireless device to the receiving device with phase rotation of a radio-wave propagation path indicated by the radio wave propagation characteristic; and

determine whether to participate in cooperative wireless communication by:

threshold processing of a time difference between the cooperative wireless device and one master cooperative wireless device that has been selected in advance from among the other cooperative wireless devices; and

threshold processing of received power of the training signal, and

the transmitter is configured to transmit the data that has been compensated by the controller to the receiving device over the downlink in response to the controller determining to participate in the cooperative wireless communication.