SHIFTER IMPLEMENTED CIRCULANT PERMUTATION MATRIX OPERATIONS

Shifter implemented circulant permutation matrix operations are realized by an integrated circuit including a forward shifter configured to shift forward each sequential value of a target segment by a shift amount to produce a forward-shifted partial segment, a reverse shifter configured to shift in reverse each sequential value of the target segment by a reverse shift value equal to a segment length minus the shift amount to produce a reverse-shifted partial target segment, a combiner configured to combine the forward-shifted partial target segment with the reverse-shifted partial target segment according to the shift amount and the segment length to produce a shifted target segment, and a mask selector configured to select at least one of a merge mask corresponding to the shift amount and the segment length and a filter mask corresponding to the segment length.