3GPP Base Station Measurements (Option K72) R&S FSL
1300.2519.12 4.286 E-11
indication of the absolute and relative channel power (referenced to the CPICH or the total
p
ower of the signal)
– T Offs [Chips]
timing offset = offset between the start of the first slot of the channel and the start of the
a
nalyzed 3GPP FDD frame
Remote: CALC:FEED 'XTIM:CDP:ERR:CTAB'
Remote: TRAC? CTAB
Code Dom Power Diagram
Selects the Code Domain Power Diagram result display. Common settings for code domain power
measurements are performed via the settings menu (MENU key). For details refer to "Softkeys of
the settings menu (3G FDD BTS mode)" on page 4.275.
This result display shows the power of all occupied code channels in a bar graph. The x–axis is
scaled for the highest code class or the highest spreading factor (512). Code channels with a lower
spreading factor occupy correspondingly more channels of the highest code class. The power of a
code channel is always measured according to its symbol rate. Unused code channels are
assumed to belong to the highest code class and displayed accordingly. The displayed power of an
unused code channel therefore corresponds to the power of a channel with the spreading factor
512 at the respective code position.
The measured power always refers to one slot. The time reference for the start of a slot is the
CIPCH slot. If the signal contains channels with timing offsets, the start of a slot of the channel may
be different from the CPICH slot start. This leads to the power of the bar graphs normally being
averaged over two adjacent slots in such cases. The power shown in the bar graphs thus does not
necessarily correspond to the slot power of the channel the bar graph belongs to.
Detected channels are displayed in yellow color.
The codes where no channel could be detected (non–active channels) are displayed in blue
color. These channel should be checked for their pilot symbols.
The channel that is adjusted via the Select Channel softkey is marked red. If it is an assigned
channel, the entire channel is marked red. If it is an unassigned code, only the entered code is
marked.
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