1xEV-DO BTS Analyzer (Option K84) R&S FSL
1300.2519.12 4.380 E-11
Code Domain Power
Selects the Code Domain Power (CDP) result display. By default the display is set to relative
scaling.
In this result display, the total signal for one channel type is taken into account over a single slot.
The R&S FSL determines the power of the different codes and plots them in a diagram. In this
diagram, the x–axis represents the code. The y–axis is a logarithmic level axis that shows the
power of each code (either in absolute or relative values - see Code Power). To configure this
result display, use the Result Settings dialog box (Settings softkey menu, Result Settings
softkey).
The number of codes on the x axis depends on the channel type (see Channel Type). Select
the slot to be analyzed with Select Code Slot.
Activate CDP Average to perform a measurement over all slots. The CDP Average analysis is
required by the standard. In case of Data and Preamble channel types the standard assumes
that preambles of different lengths do not occur in the slots.
The power values of the assigned and unassigned codes are displayed in different colors:
– Yellow: assigned code
– Cyan: unassigned code
For details on the inactive channel threshhold refer to Inactive Channel Threshold.
Set the mapping with Mapping. There is also an auto mapping function available (see Mapping
Auto). It causes complex mapping to be analyzed separately for the Data channel type and
mapping for the I or Q branch to be analyzed separately for the other channel types. In the latter
case the I/Q selection can be set by means of the SELECT I/Q softkey. For a separate analysis
of the I and Q branch, activate Code Dom Overview mode. Screen A displays the I branch and
screen B the Q branch of the signal.
Another option for obtaining an overview of the CDP is to enable complex mapping (see
Mapping). The code domain power is then constantly displayed as a complex analysis on
screen A for the selected channel type.
In case of an analysis of the Data channel, the results of complex analysis are approximately 3
dB higher than the results of a separate I or Q analysis. This is because 50% of the power
values are distributed to I and Q, respectively, for the complex modulation types of the DATA
channel type.
Remote: CALC:FEED "XPOW:CDP:RAT"
Remote: CALC:FEED "XPOW:CDP"
Remote: CDP:OVER ON
To Next Page
Loading...
