A mobile station apparatus that communicates with a base station apparatus and receives a closed-loop transmit diversity signal by a first antenna and a second antenna of the base station apparatus, the apparatus comprising:
- a wireless section for performing band conversion between a radio frequency band signal and a baseband signal of the signal communicated to and from the base station apparatus;
- a pass detection section for detecting a pass location of the signal from the base station apparatus;
- a common pilot channel despreading section for despreading a common pilot channel transmitted from the base station apparatus;
- a dedicated physical channel despreading section for despreading a dedicated physical channel transmitted from the base station apparatus;
- a common pilot channel quality measurement section for measuring at each component transmitted from the two transmitting antennas in regard to the common pilot channel, the quality of the component;
- an antenna phase difference detection section for detecting a phase difference in the components transmitted from the two transmitting antennas in regard to the common pilot channel;
- a feedback information generation section for generating, based on the phase difference, feedback information instructing the base station apparatus on a phase rotation of the signal component from the second antenna on the dedicated physical channel;
- an antenna verification section for determining a weight vector added to the signal of the dedicated physical channel transmitted from the second antenna according to the feedback information;
- a first channel inference section for inferring the channel of the signal transmission line for a component from the first antenna;
- a second channel inference section for inferring the channel of the signal transmission line for a component from the second antenna;
- a first channel compensation section for performing channel compensation for the dedicated physical channel using the result of the channel inference for the component from the first antenna;
- a second channel compensation section for performing channel compensation for the dedicated physical channel using the result of the channel inference for the component from the second antenna;
- a first RAKE synthesis section for performing a RAKE synthesis on the signal resulting from the channel compensation by the first channel compensation section;
- a second RAKE synthesis section for performing a RAKE synthesis on the signal resulting from the channel compensation by the second channel compensation section;
- an antenna combination section for combining the output from the first RAKE synthesis section and the output from the second RAKE synthesis section;
- and
- a closed-loop transmit diversity control section for exerting, when the quality of the component from the second antenna is lower than a predetermined quality value based on the quality measured by the common pilot channel quality measurement section, control to cause the feedback information generation section not to use the detection result at the antenna phase difference detection section, and to continue to use the immediately preceding feedback information, control to cause the antenna verification section not to operate, and control to cause the first channel inference section to operate and the second channel inference section not to operate.