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Add option to use global noise power for all RX channels in RFSimulator

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Added new command line option to channelmod: noise_power_dBFS. This options
allows the user to configure noise power in dBFS added instead of the per-channel
value.

This makes it so noise is not accumulated per channel reaching higher than expected
values.

The dBFS unit allows easy configuration. The gNB by default uses -36 dBFS setting.
To reach 3dB SNR one should set the noise_power_dBFS value to -39.

To configure using command line use --channelmod.noise_power_dBFS -50. Using this
setting the gNB and nrUE connect without issue.
This commit is contained in:
Bartosz Podrygajlo
2025-02-19 16:05:38 +01:00
parent 82fbb6bb04
commit 2fb541a68e
6 changed files with 54 additions and 11 deletions
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openair1/SIMULATION/TOOLS/DOC/channel_simulation.md
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@@ -142,6 +142,7 @@ Channel simulation parameters can also be specified on the command line by using
|:--- |:---- |:---- |:----|
|`modellist` |char string |`DefaultChannelList`|select and load the `modellist` from the config file.|
|`max_chan` |integer |10 |set the maximum number of channel models that can be defined in the system. Must be greater than the number of model definitions in the model list loaded at init time.|
|`noise_power_dBFS` |integer |0 |Noise power in dBFS. If set, noise per channel is not applied. To achieve positive SNR use values below the default gNB/nrUE amp backoff value (-36dBFS)|
Example usage:
```bash