A closed-loop transmitting antenna diversity method, and a base station and mobile
station apparatus therefore in a next generation mobile telecommunications system,
the closed-loop transmitting antenna diversity method having a plurality of antennas
in a mobile telecommunications system, including the steps of (a) measuring 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 result of measuring as feedback information for adjusting transmitting antenna
diversity; (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. Here, 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.
