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Performing W-CDMA TS 25.141 Clause 7 Receiver Characteristic Tests

This topic guides the user through using the preconfigured W-CDMA Clause 7 tests. Most tests use multiple signals: a wanted signal, an interferer, and some use an additional CW interferer. With some exceptions, Test Case Manager also provides the ability to export the waveform settings for use in the appropriate Signal Studio Software. For more information on the W-CDMA tests, see the W-CDMA Tests topic.

Range values such as frequency and amplitude are dependent upon the instrument identified in the Signal Generator (n:<connection status>) node. To find range values, refer to the instrument's User's Guide or Data Sheet.

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.

  1. Select a test.

    The test shows whether one or multiple test signals are required.

    1. If needed, expand Test Cases and any lower level collapsed nodes until the list of tests are displayed.

    2. Select the desired test and view its parameters noting whether it requires one or more signals.

      If the test requires more signals than the number of signal generators showing in the Hardware Connections and Settings node of the tree window, the software allows the addition of more instruments. This step occurs later in the process.

  2. Setup the instruments and make the connection to the Base test station (BTS).

  3. Configure the instrument(s).

  4. Click the Common Settings node and configure the base station parameters.

    The Base Station Type selection determines the amplitude setting (wanted, interferer, noise) in the test selections (test settings window) in accordance with the 3GPP standards, provided that Override Setting in the test settings window is not enabled.

  5. Reselect the test selected in Step 1.

  6. Configure the non-grayed out (active) parameters:

    1. 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.

    2. For each 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 instruments configured in a previous step. If an attempt is made to select the same signal generator previously selected for another signal, the software displays a message that the same signal generator cannot be used.

      To create multiple waveform files with the PXB, use the PXB (BBG1) selection for the wanted signal and the PXB (BBG2) selection for an interferer signal.

      For guidance on whether signals can be combined, refer to the Test Case Manager Software topic.

      The PXB (BBG2) selection cannot be used alone, it can only be used when another signal uses the PXB (BBG1) selection. The order in which they are used does not matter.

    3. If needed, enter a different Wanted Signal Frequency value.

      When an interferer includes frequency settings such as Operating Band, Frequency Absolute, and Δ Frequency, a change to the wanted signal Frequency value may affect these settings. Conversely a change in one of these settings may require a change in the wanted signal Frequency value.

    4. Set the remaining parameters as needed or required.

  7. 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:

    1. Enable the Override Settings by checking the box.

      This causes the grayed-out parameters(inactive) to become active so they can be changed.

    2. 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.

  8. Click the Execute button.

  9. If there is a need to stop the signals, click the Stop button.

    To restart the signals, click the Execute button, which again downloads all of the settings. If the PXB is the fading simulator:

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