General (Basic LTE FDD Downlink)

The General table in the downlink carrier node enables you to turn the downlink carrier on and off, select a predefined channel configuration, and view the length of the generated waveform.

The Baseband parameters for the downlink carrier are described in Baseband (Basic LTE FDD Downlink).

 

State

Double-click or use the drop-down menu to turn the carrier Off or On.

Channel Configuration

Select a channel configuration with the desired modulation type, bandwidth, and number of resource blocks (RB) from the Closeddrop-down menu.

The User Defined setting is not selectable until certain parameters are changed, then User Defined is automatically set by the software.

Waveform Generation Length

Choice: 1 slot (0.5 ms) | 2 slots (1.0 ms) | … | 18 slots (9.0 ms) | 19 slots (9.5 ms) | 1 frame (10 ms)

Default: 10 ms

Displays the waveform generation length and this parameter is read only. Total Sample Points is based on the selected Waveform Generation Length and Oversampling Ratio as shown below:

Total Sample Points = Base Sampling Rate (MHz) × Oversampling Ratio × 1000 × Waveform Generation Length (ms).

Figure 1 shows the generic frame structure.

Figure 1. Generic radio frame structure

Waveform Generation Offset

Range: 0 to 19 slots

Default: 0 slot

Sets the waveform generation offset.

When the waveform generation length or offset is set, Waveform Generation Length + Waveform Generation Offset <= 1 frame (10 ms) is automatically satisfied by the software.