Technical data

Chapter 19 549
W-CDMA or W-CDMA (with HSDPA) Analyzer
Using the W-CDMA or W-CDMA (with HSDPA) Analyzer
W-CDMA or W-CDMA (with HSDPA)
Analyzer
Codogram Display
This view provides a history of the spectrum. The codogram plot rises over time
until it fills the graphical section of the display. Your most recent data appears at the
bottom of the display, and your oldest data (several minutes ago to several hours
ago, depending on your settings) appears at the top of the display. In this way, you
can clearly see the changes in power that occur over a period of time. You can use it
to:
• see traffic channels as they initiate and terminate,
2 On [View] select [Zoom] or [Full]. If you are displaying Zoom view and
select Full view, the display changes the
top-left and bottom-left graphs to show
the first 256 codes in the top graph, and
the second 256 codes in the bottom
graph. If you select Zoom, the two keys,
Position and Width (see Steps 3 and 6
below), become available.
3 [Position] When you are in Zoom view, this option
changes the starting point (spread code)
of the section of the full view (upper
graph) that the Zoom view (lower graph)
will expand for more detailed analysis.
4 Enter the position using the
numeric keypad.
5[Enter]
6 On [Width] select [32], [64],
[128], or [256].
In Zoom view, smaller numbers selected
with this option correspond to narrower
zoom windows on the full view. If you
select 32 for example, you will have the
minimum window and maximum zoom.
You will also see channel information
displayed below each active channel. The
data displayed is the spreading factor
used by that channel and its spread code
or OVSF number.
Step Notes