A method and apparatus for estimating a communication channel in a wireless communication
system having multiple transmitter antennas using reduced rank estimation. The
method exploits redundant and/or a priori knowledge within a system to simplify
the estimation calculations. In one embodiment, a covariance matrix is calculated
and analyzed to determine if the channel parameters may be reduced for channel
estimation. If not, all parameters are used, otherwise a reduced rank matrix is
used for the calculation.
