  The Omega-preprocessing was introduced to improve phase noise rejection by
using a least square algorithm. The associated variance is the PVAR which is
more efficient than MVAR to separate the different noise types. However, unlike
AVAR and MVAR, the decimation of PVAR estimates for multi-tau analysis is not
possible if each counter measurement is a single scalar. This paper gives a
decimation rule based on two scalars, the processing blocks, for each
measurement. For the Omega-preprocessing, this implies the definition of an
output standard as well as hardware requirements for performing high-speed
computations of the blocks.
