Blind identification of FIR MIMO channels by group decorrelation

We present a new method for identification of FIR MIMO channels driven by unknown, uncorrelated and colored sources. This method, belonging to the BID (blind identification by decorrelation) family, makes use of the mutual uncorrelation of the unknown sources by first decorrelating the observed signals into two uncorrelated groups. The two decorrelators are then used to estimate the channel matrix (i.e., MIMO channel transfer function matrix) up to a constant matrix. This constant matrix is finally determined using a BID method for instantaneous MIMO channels. This new method, named BID-G, is shown to be much more robust than the subspace method that requires the channel matrix to be irreducible and column-reduced.