The present invention relates to a transmit diversity method and a base station apparatus and mobile station apparatus therefor in a mobile communication system.; Closed-loop transmit antenna selection combining method according to the present invention, a diversity method, by measuring the channel information from a signal received via a plurality of antennas used in a base station ready for step, the output channel information matrix and outputting the form of a matrix in advance the method comprising transformation using a transform matrix to the complex basis vector set, the reception of the plurality of antennas by using the transformed channel information matrix measured power is transferred to step and a detection result of the maximum is detected, the element of the complex basis vector set that is as feedback information for adjusting the antenna diversity and a step for transmitting to the base station.; The invention to be maintained while the power is evenly distributed between the transmitting antennas performed well in high-speed, and ultimately to the cost of the loss of high-frequency (RF) treatment stage to a minimum. In particular, to adapt to the use to average the information between the two successive slots, more precisely in the low-speed channel.
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