Digital Signal Processing Reference
In-Depth Information
TBi-1
Fig. 11
Block diagram of the interface between each PE and CU
additional operation is done except writing the particle twice to the memory. If the
least significant bit of the replication factor before split is 1, then 1 is added back to
one of the two split particles. Consider a particle in which the replication factor is 4.
In this case, the least significant bit is 0 and a simple division generates two identical
particles with a replication factor of 2. On the other hand, if the replication factor is
3, this number is divided via a simple shift, which results in a replication factor of 1
each. Therefore, 1 is added back to one of the two particles. The splitting function at
the RB is required to satisfy the granularity condition. But in order to further reduce
the granularity, the split mechanism is also incorporated in the RTB. However, no
mechanism is necessary in the TB since all the particles in the TB have a replication
factor of 1.
Figure
12
illustrates execution time schedule of the PE-CU-PE activity. During
particle reception, before
M
/
P
cycles of resampling, the particles from the split
operator are written to the RB
i
and RTB
id
. If the total number of particles (i.e.,
sum of replication particles) in the RB
i
is larger than
M
/
P
, the rest of the particles
are transmitted to the RTB
id
from the PE
i
. The number of unique particles may be
