Patent ID: 6892059

Claim:
A closed-loop transmitting antenna diversity method having a plurality of antennas in a mobile telecommunications system, the closed-loop transmitting antenna diversity method comprising the steps of: (a) measuring, in a mobile station, the changed amount per unit time of the phase difference between antennas for each of the plurality of antennas which are used in a base station; (b) transmitting the results of the measuring performed in step (a) as feedback information for adjusting transmitting antenna diversity to the base station; (c) receiving and interpreting feedback information in the base station; (d) calculating the weighted value of array antennas for each antenna, using the interpreted feedback information; and (e) multiplying data, which is to be transmitted from the base station to a mobile station, by the array antenna weighted value, and outputting the result through a corresponding antenna, wherein the changed amount per unit time of the phase difference between antennas is obtained by subtracting the previous phase difference between antennas, which the base station knows, from the phase difference between antennas, which is calculated by a current mobile station.