Cooperative wireless device and program for same
AssigneeNational Institute of Information and Communications Technology
InventorsKenichi Takizawa, Satoshi Yasuda, Nobuyasu Shiga
Life of this patent
Estimating the term…
Abstract
A base station includes the following parts: a propagation estimation part that estimates a radio wave propagation characteristic between a terminal and base station based on a training signal received from the terminal; a phase compensation part that compensates data to be transmitted to the terminal with phase rotation of a carrier wave that is indicated by the radio wave propagation characteristic; and a frequency conversion part that transmits the data that has been compensated by the phase compensation part to the terminal.
Claims6
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.
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.
Dependencies are inferred from the claim text.