Wireless communication mobile station device and method for using precoding matrix

摘要

Provided is a wireless communication mobile station device capable of suppressing an increase in an SRS resource even when the mobile station is provided with a plurality of antennas. In the device, a weighting section (115) weights transmission data inputted from an IFFT section (111) and an SRS inputted from an IFFT section (114) by using a precoding matrix (&phgr;) and a precoding matrix (&phgr;inv) orthogonal to the precoding matrix (&phgr;). A control unit (106) controls the interval for using the precoding matrix (&phgr;inv) independently of the interval for using the precoding matrix (&phgr;).