Real Time

Using Predefined Configurations

The software provides various preconfigured multicarrier and mixed format configurations to facilitate waveform setup. The predefined parameters for these base configurations may be modified, and the configuration can then be renamed and saved as a quick setup. This procedure assumes that you have successfully completed the required installation and equipment setup.

1. Click Waveform Setup in the tree view. In the parameter view, click to add a new waveform.

2. Enter the name, "3RDORevA"in the Waveform Name cell, and "Precon" in the Comment cell. Leave Playback and Mode parameters off.

3. Click WFM1 in the tree view.

4. Click at the top of the parameter view, and select 1xEV-DO Rev A Reverse 3 Carrier from the drop-down menu.

5. Observe that three new carriers have been added under WFM1 in the tree view.

6. Click Carrier 1 in the tree view.

   This predefined setup configures a non-coded traffic channel with physical layer packet size of 4096 bits, Q2 modulation (QPSK modulation with 2-ary Walsh cover modulated symbols), and a – 1.25 MHz frequency offset. 

7. Click Channel Setup in the tree view.

   Note the preconfigured settings for the relative gain for the Pilot, RRI, DRC, and DSC channels.

8. Click Packets in the tree view.

   The data rate and gain settings are preset. The data rate of 614.4 / 307.2 / 204.8 / 153.6 kbps (4096) Q2 corresponds to the data rate [kbps] after 4, 8, 12, and 16 slots, (payload data size [bits]), and modulation type respectively.

9. Click Timeslots in the tree view.

   Note that DRC (data rate control) data is preconfigured to 12. The DRC data sets the fixed, 4-bit data rate control pattern, indicating the selected serving sector and the requested data rate on the forward traffic channel.

10. Click Carrier 2. This configures a traffic channel with encoding. All predefined parameters are similar to Carrier 1 except for frequency offset.

    • Note that in the Packets window, the Encoder is set to On.

    • In the Timeslots window, the ACK data bit is set to 1 (no acknowledgement), indicating that the physical layer packet was not successfully received from the access network.

11. Click Carrier 3. All predefined parameters are similar to Carrier 1 except for frequency offset. 

12. Click in the tool bar. The software generates an I/Q waveform file in accordance with the current channel configuration and signal generation setup. Waveform generation time varies proportionally to the complexity of the waveform.

13. After the waveform is generated, you can examine its characteristics. You can view plots of the baseband spectrum, I and Q signals, and CCDF curve prior to downloading the file to the signal generator.

    1. In the tree view, click WFM1.

    2. Click the CCDF and Waveform tabs at the bottom of the window to view their respective graphs.