Number of input cycles to buffer before attempting to form an output
frame, specified as an integer. The block simulates faster when this
parameter is larger. However, the block returns at most one frame from each
search window. If more than one frame fits in this window, the block returns
the first one it finds and drops the later frames. The default setting, 1
cycle, never drops frames, but results in slower simulation. Therefore, it
is a best practice to set this parameter to the minimum number of cycles per
frame, including idle cycles.
For example, calculate the valid cycles and idle cycles representing each
frame. Each cycle may include more than one sample, depending on your
Input size (samplesize)
setting.
If
the frame and sample spacing is variable or unknown, then a conservative
compromise is to set the
Frame search window to the
minimum number of valid cycles per frame. For instance, for a turbo encoder
block, the output frame size depends on the coding rate,
1/
R, and tail bits specified by the LTE standard. The
output data has
R samples per cycle. This calculation
does not include any idle cycles between samples or between frames.