| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce processing overhead when a mobile station device notifies a base station device of a precoder. Ž<P>SOLUTION: The mobile station device transmits a reference signal to the base station device (301), and the base station device calculates a propagation path of an uplink from the reference signal, calculates an optimal precoder in each frequency block (302), and transmits downlink grant to the mobile station device (303). Next, the base station device transmits downlink data including the precoder to the mobile station device according to the transmitted downlink grant (305). Then, the mobile station device uses information written in the downlink grant to extract the precoder from the downlink data (306). The mobile station device uses the precoder to precode uplink data on the basis of the uplink grant (307). A precoded uplink signal is transmitted to the base station device on the basis of a resource following the uplink grant (308). Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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