Patent ID: 8213486

Claim:
A method for use in a G-RAKE receiver for simplifying the calculations for pre-whitening in the G-RAKE receiver, where the method comprises the steps of: receiving at least two signals, by means of at least two antennas via a channel, where, due to the channel, each one of said received signals comprises time delayed and attenuated versions of the original signals, each received signal, forming a corresponding vector of received signal versions and the vectors forming a matrix of received signals, where, due to correlation between the antennas, the received signals are correlated, each version also comprising a certain amount of colored noise; estimating the correlating effect of the antennas; formulating said estimate in matrix form; acquiring essentially uncorrelated received signal vectors in an essentially uncorrelated received signal matrix by multiplying the received signal matrix with the inverse of said estimate in matrix form; and using a calculated inverse of a covariance matrix of the calculated essentially uncorrelated signal vectors to pre-whiten the noise, where said covariance matrix thus essentially is a block diagonal matrix.