In a wireless communication system using multiple antennas at the
transmitter and multiple antennas at the receiver, with a sufficiently
large number of antennas and/or diversity order, the same performance
that is obtainable when employing instantaneous rate indication feedback
can be attained without any such short-term feedback by adjusting the
data rate of each transmit antenna according to a prescribed function.
The prescribed function does not depend on the short-term state of the
channel, but instead only depends on its long-term statistics, which may
be fed back from the receiver to the transmitter at relatively lengthy
intervals.