According to the invention, a base station has an antenna device with a
plurality of antenna elements and is connected to a subscriber station via a radio
interface. The direction of incidence, the attenuation and the delay times of connection
paths used for beam forming for signal sections for channel estimation purposes
are determined from the transmissions of the other radio station in a known manner.
The beam-forming vector for the transmit signal is constant during these signal
sections for channel estimation purposes, for which the radio station can estimate
a reception characteristic of the other radio station. Outside the signal sections
for channel estimation, a symbol-specific beam-forming vector is determined which
takes into account variable symbol-related properties of the transmit signal (for
example correlation properties of CDMA codes) which are not constant during a time
slot but rather vary from symbol to symbol.