Specifications

15
It is possible to generate a third RC3, RC4 or RC5 traffic channel from
ESG #2. In the Link Control menu, channel 2 may be toggled to F-SCH
for a second supplemental traffic channel. If three RC3, RC4 or RC5
traffic channels are selected, a "Code Power Err" message will appear
with a value of error listed. This means that some of the symbols will
have an error associated with them and the code domain will exhibit
some artifacts. This is a result of system limitations. For situations
where the user is not concerned about power deviation this may be
acceptable and will allow an additional channel to be configured. I/Q
map rotation provides another alternative (see inset).
Power mapping procedure
The power mapping procedure defines the process for mapping or
aligning the channel powers between the two instruments. This
procedure must be followed for the two-box configuration each time
the power level settings are modified. The I/Q Voltage Scale adjusts the
power ratio between the two ESGs. The channel power scaling, or the
use of the OCNS channel, adjusts the individual channel power levels to
match their true values.
1
To determine the appropriate power mapping levels, calculations may
be performed manually as defined in the ESG Option 201 User’s Guide,
or they may be determined with the Excel® spreadsheet which is
included with the ESG Family Signal Generators Option 201 Real-time
cdma2000 Personality User’s and Programming Guide. The spreadsheet
is also available on the ESG website at http://www.agilent.com/find/
powermap. The Excel spreadsheet method is preferable due to ease of
use. The inputs to the spreadsheet are the desired levels for each of the
code channels. The outputs from the spreadsheet are the settings for
I/Q Voltage Scale and also the updated settings for the channel power
levels or the OCNS, if used.
I/Q Map Rotation
The ESG also allows a 45° rotation
of the I/Q map to alleviate the
"Code Power Err" problem. Rotating
the I/Q map on both boxes changes
the I/Q map so three RC3, RC4
or RC5 traffic channels may be
supported on the second box;
but then only two channels may be
supported on the first ESG without
creating power deviations. As an
example, an F-PICH and an
F-SYNCH channel could be
configured on ESG #1 and an
F-FCH and two F-SCH channels
could be configured on ESG #2.
1. The total power in the channels should equal 0 dB or 100%. This may be accomplished by adjusting the levels of each active channel to equal 0 dB or by
adding an OCNS channel to make up for the short-fall to achieve 0 dB.