1. A receiver apparatus for use in a telecommunications system which provides at least two pilot sequences, said receiver apparatus comprising channel estimation means for estimating channel taps separately for each of said at least two pilot sequences in every transmission block, and for applying information of estimated channel taps obtained from said estimation to at least one of a temporal and spatial filtering or combining operation to refine a channel estimate, wherein said channel estimation means is adapted to estimate at least one correlation factor for said obtained estimated channel taps, to compare said at least one correlation factor with a respective threshold value, and to select between a scalar filtering operation, involving estimated taps of only one of said at least two pilot sequences, and a vector filtering operation, involving estimated taps of more than one of said at least two pilot sequences, based on the result of said comparison.