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NR UE: add PI controller to continuous frequency offset compensation

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Thomas Schlichter
2025-01-14 13:29:29 +01:00
parent 84712f5f92
commit 18469302d8
4 changed files with 15 additions and 2 deletions
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doc/RUNMODEM.md
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@@ -139,6 +139,8 @@ Here are some useful command line options for the NR UE:
| `--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. |
| `--freq-sync-P` | Sets the coefficient for the Proportional part of the PI-controller for the continuous frequency offset compensation. Default value 0.01. |
| `--freq-sync-I` | Sets the coefficient for the Integrating part of the PI-controller for the continuous frequency offset compensation. Default value 0.001. |
| `--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). |
| `--time-source` | Sets the time source (internal or external). |