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Merge remote-tracking branch 'origin/ntn_leo_freq_comp' into integration_2025_w15 (!3355)

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NR UE: add support for continuous frequency offset compensation (in particular NTN LEO Doppler)

- move function add_noise() to file
  openair1/SIMULATION/TOOLS/phase_noise.c
- refactor (co)sinus calculation out of phase_noise() into get_sin_cos()
  in nr_common.c
- NR UE: continuously estimate the frequency offset using PBCH DMRS
- NR UE: add command line parameter --initial-fo to specify known
  initial frequency offset
- NR UE: add support for continuous DL frequency offset compensation
  --cont-fo-comp
- NR UE: add support for continuous UL frequency offset
  pre-compensation. 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
- NR UE: add PI controller to continuous frequency offset compensation
- rfsimulator: enable and correct NTN LEO doppler simulation
- use SIMD to speed up nr_fo_compensation()
- Extend NTN LEO example in RUNMODEM.md to include continuous Doppler
  compensation
- NR UE: in nr_adjust_synch_ue() extend the peak search to +/- cyclic
  prefix size, esp. for LEO NTN scenarios the timing drifts during
  initial sync, which is mostly compensated with
  --ntn-initial-time-drift. But there might be a residual time offset,
  and by extending the peak search window we make this more tolerant.
- NR UE: remove unused nr_slot_tx_offset, it is unused since commit
  f3e60a14
- NR UE: remove now unnecessary local variable
  update_ntn_system_information, directly use
  UE->ntn_config_message->update instead
This commit is contained in:
Robert Schmidt
2025-04-14 16:59:27 +02:00
parent cb175569eb 75b237fb90
commit 07f8158378
27 changed files with 678 additions and 168 deletions
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executables/nr-uesoftmodem.h
+12
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@@ -14,6 +14,10 @@
#define CONFIG_HLP_TIME_SYNC_I "coefficient for Integrating part of time sync PI controller\n"
#define CONFIG_HLP_NTN_INIT_TIME_DRIFT "Initial NTN DL time drift (feeder link and service link), given in µs/s\n"
#define CONFIG_HLP_AUTONOMOUS_TA "Autonomously update TA based on DL drift (useful if main contribution to DL drift is movement, e.g. LEO satellite)\n"
#define CONFIG_HLP_INITIAL_FO "Initially compensated DL frequency offset (e.g. known Doppler shift in NTN LEO scenario)\n"
#define CONFIG_HLP_FREQ_SYNC_P "coefficient for Proportional part of continuous frequency offset compensation PI controller\n"
#define CONFIG_HLP_FREQ_SYNC_I "coefficient for Integrating part of continuous frequency offset compensation PI controller\n"
#define CONFIG_HLP_CONT_FO_COMP "Enable continuous frequency offset (FO) estimation and compensation and specify main FO source (1 = local oscillator, 2 = Doppler shift)\n"
#define CONFIG_HLP_AGC "Rx Gain control used for UE\n"
#define CONFIG_HLP_NUM_UL_ACTORS "Number of UL actors to use. Set to 0 to use the default value\n"
@@ -66,6 +70,10 @@
{"time-sync-I", CONFIG_HLP_TIME_SYNC_I, 0, .dblptr=&(nrUE_params.time_sync_I), .defdblval=0.0, TYPE_DOUBLE, 0}, \
{"ntn-initial-time-drift", CONFIG_HLP_NTN_INIT_TIME_DRIFT, 0, .dblptr=&(nrUE_params.ntn_init_time_drift), .defdblval=0.0, TYPE_DOUBLE, 0}, \
{"autonomous-ta", CONFIG_HLP_AUTONOMOUS_TA, PARAMFLAG_BOOL, .iptr=&(nrUE_params.autonomous_ta), .defintval=0, TYPE_INT, 0}, \
{"initial-fo", CONFIG_HLP_INITIAL_FO, 0, .dblptr=&(nrUE_params.initial_fo), .defdblval=0.0, TYPE_DOUBLE, 0}, \
{"freq-sync-P", CONFIG_HLP_FREQ_SYNC_P, 0, .dblptr=&(nrUE_params.freq_sync_P), .defdblval=0.01, TYPE_DOUBLE, 0}, \
{"freq-sync-I", CONFIG_HLP_FREQ_SYNC_I, 0, .dblptr=&(nrUE_params.freq_sync_I), .defdblval=0.001, TYPE_DOUBLE, 0}, \
{"cont-fo-comp", CONFIG_HLP_CONT_FO_COMP, 0, .iptr=&(nrUE_params.cont_fo_comp), .defintval=0, TYPE_INT, 0}, \
{"agc", CONFIG_HLP_AGC, PARAMFLAG_BOOL, .iptr=&(nrUE_params.agc), .defintval=0, TYPE_INT, 0}, \
{"num-ul-actors", CONFIG_HLP_NUM_UL_ACTORS, 0, .iptr=&nrUE_params.num_ul_actors, .defintval=0, TYPE_INT, 0}, \
}
@@ -91,6 +99,10 @@ typedef struct {
double time_sync_I;
double ntn_init_time_drift;
int autonomous_ta;
double initial_fo;
double freq_sync_P;
double freq_sync_I;
int cont_fo_comp;
int agc;
char *usrp_args;
char *tx_subdev;