The General table in the PRACH component carrier node enables you to turn the PRACH carrier on and off, select a saved channel configuration, and set the length of the generated waveform.
The Baseband parameters for the PRACH component carrier are described in Baseband (Basic LTE-A PRACH).
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1. General |
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Double-click or use the drop-down menu to turn the carrier Off or On.
Select a channel configuration with the desired bandwidth and number of resource blocks (RB) from the drop-down list.
The User Defined setting is not selectable until certain parameters are changed (e.g. in the Component Carrier node: State, Auto Symbol Rolloff Length Configuration, Baseband Filter; or in the Uplink node: System Bandwidth, PRACH DFT Swap, ...) then User Defined is automatically set by the software.
Choice: 1 subframe (1ms) | 1 frame (10 ms) | 2 frames (20ms) | 3 frames (30ms) | 4 frames (40 ms) | 8 frames (80 ms) | 10 frames (100ms) | 11 frames (110ms) | 20 frames (200ms)
Default: 1 frame (10 ms)
Double-click or use the drop down menu to select a waveform generation length. 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 PRACH Preamble structure.
Figure 1. PRACH Preamble structure