BLIND IDENTIFIABILITY OF CERTAIN CLASSES OF MULTIPATH CHANNELS FROM 2ND-ORDER STATISTICS USING ANTENNA-ARRAYS

Recently, Ding [7] has pointed out several classes of multipath channe ls that are not blindly identifiable from fractionally spaced samples and second-order cyclic spectra, In this letter, we consider the blind identification problem using multiple antennas and show that the mult ipath channels of [7] will not give rise to any common roots among the subchannels formed from the antennas and, hence, they can be identifi ed from second-order statistics. In our development, we will point out the role of bandlimitedness of the channels in characterizing differe nt classes.