This topic guides the user through using the preconfigured W-CDMA Clause 8 tests. Because the Clause 8 tests use fading, they require the use of the N5106A PXB Baseband Generator and Channel Simulator, or an external fader. Either selection requires the use of signal generators, one per signal. The external fader, while a selection within the test settings, is not supported by the software. For more information, see the LTE FDD and LTE TDD Tests topic.
Test Case Manager also provides the ability to export those waveform settings that are created using a waveform file. The exported settings can be imported for use in the appropriate Signal Studio software. The real-time signal settings are captured and can be viewed using the SCPI Log Viewer. To save the currently download signal settings on the PXB, use the PXB save settings feature (see the PXB online documentation for more information).
Each software setting has a hint (setting information) associated with it. To use the hints, just click on the setting and the hint appears below the settings window.
Some fields within the setting windows are grayed out, while others are not and allow a different setting. The grayed out fields are static settings required by the standards and may change, in accordance with the standards, as active fields within the same window or the Common Settings window are changed.
While making changes, you can monitor the signal changes by viewing the graphic at the bottom of the test settings window. If there is a need to save all of the software settings, this can be done by using the Save As... function to create a state file.
Setup the instruments and make the connections.
Configure the instrument(s).
If using an external fader:
Connect the signal generators to the external fader.
Use the process Configuring the Signal Generator to set the properties for each signal generator.
If using a PXB, use the Configuring the PXB process to set the PXB properties, which includes information for signal generators that connect to the PXB.
Click the Common Settings node and configure the base station parameters.
Properties within the Common Settings node may affect some of the values for the test selection settings in accordance with the 3GPP standards, provided that Override Setting in the test settings window is not enabled:
Base Station Type—Amplitude setting for wanted and noise along with Eb/No and Ec/No values. For Clause 8.11 tests, the Propagation Condition selections are based on the Base Station Type.
Receiver Diversity—Amplitude, Eb/No, and Ec/No values
Use the Base Station Type field to select the base station type.
The Base Station Type drop-down menu selections do not change based on test selection, so ensure that the selected type is compatible with the test selection. For more information, refer to the 3GPP standards
Select whether to use Receiver Diversity:
box unchecked means only one antenna is required
box checked means diversity use and two antennas are required
In the Wanted Scrambling Code field, enter the wanted signal scrambling code.
Select the desired test.
Set the Channel Configuration fields:
In the Fading Simulator field, use the drop down menu to select the instrument.
If PXB is the selection, the signal generators are connected to and controlled by the PXB. They are configured using the software's PXB setting window.
If External Fader is the selection:
it is not controlled by the software
it must provide the AWGN
the software controls the signal generators
View the Number of Tx Ant read only field to ensure that the configuration is using the correct number of antennas.
Change the number of antenna using the Receiver Diversity property in the Common Settings node.
If the Propagation Condition field is active and a different entry is needed, click on the displayed setting or the drop-down arrow, and make a selection.
If External Fader is the Fading Simulator selection, ensure that the external fader propagation condition matches this setting.
Configure the Wanted Signal non-grayed out (active) parameters.
If using an external fader:
For a TS 25.141 compliant test signal, leave State enabled.
If there is a need to disable State, refer to the State Checkbox Behavior topic for more information.
For the Wanted Signal, click the Signal Generator field and use the drop-down menu to select an instrument for the current signal.
The drop-down selection menu contains all of the signal generators configured in a previous step. The signal generator must be a configured model shown in the requirements.
Configure the AWGN based on the Fading Simulator selection:
For the PXB, determine whether to include AWGN by changing the status of the State checkbox.
checked means that AWGN is applied per the 3GPP standards
unchecked means no AWGN, and the test may no longer be in compliance with the 3GPP standards
For the External Fader, configure the AWGN on the fader.
The software does not support the external fader, so the AWGN State checkbox and other properties are grayed out. The external fader must be capable of supplying the AWGN signal.
If there is a need to reconfigure the grayed out parameters, which causes the test to no longer be in compliance with the 3GPP standards, perform the following steps:
Enable the Override Settings by checking the box.
This causes the grayed-out parameters(inactive) to become active so they can be changed.
Modify the settings as needed.
After modifying the settings, if the Override Settings is disabled by unchecking the box, the software resets the grayed out parameters back to their default settings based on the current Base Station Type selection in the Common Settings.
Click the Execute button.
If there is a need to stop the signals, click the Stop button.
To restart the signals, click the Execute button, which again performs a download. If the PXB is the fading simulator:
all of the settings are downloaded if Delta Update State is unchecked
only those settings that differ from the previous download are downloaded if Delta Update State is checked