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NR UE: add support for continuous UL frequency offset pre-compensation

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Depending on the main source of frequency offset, pre-compensate the UL frequency offset (FO) accordingly.
Therefore modify the flag `--cont-fo-comp` to accept an integer value, where
 - `1` specifies, that the main FO contribution comes from the accuracy of the local oscillator (LO)
 - `2` specifies, that the main FO contribution comes from Doppler shift
This commit is contained in:
Thomas Schlichter
2025-04-10 13:56:13 +00:00
parent aac4642910
commit 84712f5f92
3 changed files with 14 additions and 3 deletions
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doc/RUNMODEM.md
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@@ -136,7 +136,8 @@ Here are some useful command line options for the NR UE:
| Parameter | Description |
|--------------------------|---------------------------------------------------------------------------------------------------------------|
| `--ue-scan-carrier` | Scan for cells in current bandwidth. This option can be used if the SSB position of the gNB is unknown. If multiple cells are detected, the UE will try to connect to the first cell. By default, this option is disabled and the UE attempts to only decode SSB given by `--ssb`. |
| `--ue-fo-compensation` | Enables the frequency offset compensation at the UE. Useful when running over the air and/or without an external clock/time source. |
| `--ue-fo-compensation` | Enables the initial frequency offset compensation at the UE. Useful when running over the air and/or without an external clock/time source. |
| `--cont-fo-comp` | Enables the continuous frequency offset (FO) estimation and compensation. Parameter value `1` specifies that the main FO contribution comes from the local oscillator's (LO) accuracy. Parameter value `2` specifies that the main FO contribution comes from Doppler shift. |
| `--initial-fo` | Sets the known initial frequency offset. Useful especially with large Doppler frequency, e.g. LEO satellite. |
| `--usrp-args` | Equivalent to the `sdr_addrs` field in the gNB config file. Used to identify the USRP and set some basic parameters (like the clock source). |
| `--clock-source` | Sets the clock source (internal or external). |