A MEHTOD FOR SIMPLIFYING THE CALCULATINOS FOR PRE-WHITENING IN A G-RAKE RECEIVER

摘要

The present invention relates to a method for simplifying calculations for pre-whitening in a G-RAKE receiver (1 ), comprising receiving at least two signals (yi (t), y2(t)) with at least two antennas (2, 3) via a channel (5), where each one of said received signals comprises time delayed and attenuated versions of the original signals (x(t)). Each received signal (y-ι (t), y2(t)) forms a corresponding vector (y-i, y2) of received signal versions and the vectors (y-i, y2) form a matrix (Y) of received signals, where, due to correlation between the antennas (2, 3), the received signals (y-i, y2) are correlated. Each version also comprises a certain amount of coloured noise (z(t)). The correlating effect of the antennas is estimated and formulated in matrix form and used to acquire essentially uncorrelated received signal vectors (S1, S2) in an essentially uncorrelated received signal matrix (S). A calculated inverse (R;1) of a covahance matrix (R8) of the calculated essentially uncorrelated signal vectors (Si, S2) is used to pre-whiten the noise (z(t)). The present invention relates to a G-RAKE receiver arranged for applying the method above.