Real Time

Example BER Measurement

The following example procedure shows you how to configure the equipment and Signal Studio software for a typical BER measurement for a fully encoded waveform.

Step 1: Setup the equipment

Step 2: Select the DVB-T standard

Step 3: Configure the DVB-T waveform parameters

Step 4: Configure the DVB-T channel coding parameters

Step 5: Select a data source for the BER measurement

Step 6: Configure the signal generator settings

Step 7: Generate and download the waveform to the signal generator

In parameter view windows, you can check and then click the desired parameter for a brief description.

Step 1: Set up the equipment as shown below

 

Step 2: Select the DVB-T/H standard

From the Format menu, select DVB-T/H.

Step 3: Configure the DVB-T/H waveform parameters

  1. In the Waveform Setup (DVB-T/H) pane: click Carriern

  2. Edit the parameters to set up a waveform with the following characteristics:

Step 4: Configure the DVB-T and DVB-H parameters as shown below 

To make flexible BER tests with different configurations (BER tests at different levels), you may re-configure the switches in this step.

Step 5: Select a data source for the BER measurement

  1. In the Tree View: click Carriern

  2. In the Carrier pane: click Data Source Type > (in the right cell click) > Test Pattern

  3. Click Pattern Bits > (in the right cell click)

  4. In the Data Pattern Selection Window: Click on User Defined

  5. Click Insert option, click on Truncated PN9

    The length of the truncated PN sequence depends on the RS encoder setting. Since RS encoder ON was previously selected, it is 376 bits for PN9. The purpose of the truncation is to ensure that the PN sequence repeats integer times in the waveform, providing a predictable bit pattern for the BER measurement.

  6. Click Export to save the truncated PN9 to a specific file, which you can use as the expected data at the receiving end to calculate the BER.

  7. Click OK to accept the data source configuration.

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Step 6: Configure the signal generator settings

Click the Instrument Settings node in the tree view, set the MXG/EXG/ESG/PSG’s frequency and amplitude to the values below

Step 7: Generate and download the waveform to the MXG/EXG/ESG/PSG

  1. From the tool bar, Click .

    Notice that a dialog appears to ask you to change the Number of Super Frames. Accept it to ensure that de-scrambler in the receiver works continuously and the truncated PN sequence repeats integer times in the generated waveform.

  2. Observe the message area of the status bar to track waveform generation progress.

  3. When waveform generation is complete, click .