There is provided an antenna array apparatus using a GPS signal in a base station
and a beamforming method thereof. In the antenna array apparatus, a GPS signal
processor receives GPS position information from a mobile station and calculates
the position information of the mobile station. A signal processor calculates a
weight vector using the position information to form a transmission/reception beam.
A transmission/reception beamformer forms the transmission/reception beam according
to the weight vector.