| 摘要 |
A first communications device (110) wirelessly sends synchronous signals. A second communications device (120) and a third communications device (130) can directly communicate with each other and at least one is wirelessly connected to the first communications device (110). A control device (140): wirelessly sends, from the second communications device (120) and at the same timing as the transmission of the synchronous signals, a measurement signal having a waveform pattern orthogonal to the synchronous signals and having the same frequency band; and receives from the third communications device (130) the reception results for the measurement signal in the third communications device (130). |
