| 摘要 |
<p>PROBLEM TO BE SOLVED: To solve a problem that a conventional mobile unit cannot have recognized in which transmission state a base station makes transmission when a state of a transmission channel of an outgoing link is deteriorated in transmission diversity conducted in a closed loop. SOLUTION: The mobile unit of this invention transmits a control command to control a transmission state of the base station having two or more transmission antennas to the base station through an incoming link in order to improve the reception state of the mobile unit through the outgoing link, the base station controls the transmission state according to the control command and the mobile unit receives the signal transmitted from the base station in this state. The mobile unit has a reception section that receives a signal of the outgoing link, an outgoing link transmission state estimate section that estimates a transmission channel state of the outgoing link with respect to each transmission antenna of the base station from the received signal, an incoming link transmission channel state prediction section that predicts the transmission channel state of the incoming link from the received signal, a base station transmission state prediction section that predicts the transmission state of the base station on the basis of the transmission channel state of the outgoing link and the predicted transmission channel state of the incoming link, and a demodulation section that applies demodulation processing to the received signal on the basis of the predicted transmission state of the base station.</p> |
