530 Chapter 16
W-CDMA Uplink Digital Modulation for Receiver Test
Compressed Mode Multiple Transmission Gap Pattern Sequence (TGPS) Overview
You can see in Figure 16-54 that an offset is required between the pattern sequences so the compressed
frames do not overlap. This is done using connection frame numbers (CFN), which are a subset of the
system frame numbers (SFN). Each value of the CFN indicates a frame number with the first frame
numbered zero. In Figure 16-54, TGPS 1 has a two frame offset since the first compressed frame starts at
frame two. This would require that TGPSI 1 has a CFN of two. TGPS 2 has no offset, so its CFN is zero. For
the compressed mode feature, the CFN is set using the TGCFN (transmission gap connection frame number)
field within the compressed mode display.
If you plan on a continuous signal output with multiple pattern sequences, you have to ensure that the
compressed frame alignment remains consistent. It is easy to set up a compressed frame sequence that
initially transmits the intended pattern, but as the signal progresses, the positioning for the compressed
frames among the multiple sequence patterns start overlapping. This problem is especially predominant
when multiple transmission gap lengths (TGL1/2) and transmission gap pattern lengths (TGPL1/2) are used.
To Next Page
Loading...
Need help?
General
