The invention refers to a mobile radio communication system (1) for
downlink transmission and to a method for transmitting a signal (s)
across at least two downlink paths (5, 6) of a multiple antenna (3, 4)
mobile radio communication system (1). The system (1) comprises: a
base station (2) comprising a plurality of antennas (3, 4); at least one
mobile user equipment (8); at least two downlink paths (5, 6) across at
least two of the antennas (3, 4) for transmitting a signal (s) from the
base station (2) to the at least one user equipment (8), each downlink
path (5, 6) comprising a complex channel coefficient (h.sub.1, h.sub.2);
and a feedback path (9) for returning information on at least one
complex weight (w) from the user equipment (8) to the base station (2),
the at least one complex weight (w) being used for multiplying the signal
(s) which is transmitted across at least two of the downlink paths (6).
In order to enhance the tolerance of the system (1) against transmission
errors (11) on the feedback path (9) it is suggested that the antennas
(3, 4) of the base station (2) are disposed in such a distance (a) to one
another that the channels of the antennas (3, 4) are correlated. It is
further suggested that error detection mechanisms for detecting
transmission errors (11) are incorporated in the feedback path (9).
Further, it is suggested that error correction mechanisms for correcting
transmission errors (11) are incorporated in the feedback path (9).
Finally, it is suggested that filter mechanisms (19, 20) are incorporated
in the user equipment (8) and in the base station (2).