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11 Commits
Author SHA1 Message Date
Thomas Schlichter dd827c7bd8 refactor (co)sinus calculation out of phase_noise() into openair1/PHY/TOOLS/get_sin_cos.c 2025-04-10 12:37:19 +00:00
Thomas Schlichter 9e4df97d84 move function add_noise() to file openair1/SIMULATION/TOOLS/phase_noise.c 2025-04-10 12:36:30 +00:00
Bartosz Podrygajlo 23cc049157 Remove unnecessary includes in rfsimulator 2024-09-26 14:59:14 +02:00
Laurent OpenCells 4511e70fac fix from ci results 2021-04-05 12:56:52 +02:00
Laurent OpenCells c0ef3e6f88 fix gcc reported issues 2021-04-03 23:37:58 +02:00
Thomas Schlichter 6803e78ceb Merge remote-tracking branch 'develop' 
Conflicts:
	openair1/PHY/NR_TRANSPORT/nr_dlsch.c
	openair1/PHY/NR_UE_ESTIMATION/nr_dl_channel_estimation.c
	openair1/PHY/NR_UE_TRANSPORT/nr_dlsch_demodulation.c
	openair1/SCHED_NR_UE/phy_procedures_nr_ue.c
	openair2/RRC/NR/nr_rrc_proto.h
 2020-11-24 16:58:58 +01:00
Parminder Singh 4fe5986845 Corrected conditional statement wrt OAI Formatting Rules 2020-11-12 19:29:10 +01:00
Parminder Singh 13645b1b5e Updated the sin cos table condition check 
- Sin cos table quadrant condition checks are updated
- function are indented properly
- Debug prints are updated for double data type
 2020-11-05 16:31:16 +01:00
Parminder Singh 209785551a Review Comments are updated 
- updated return function value to -1
- removed static variable for dmrs symbol selection for channel
- Updated sin cos quadrant check conditions
- removed casting from PTRS slope and related calculations
 2020-11-04 11:29:35 +01:00
Parminder Singh 741a5b98e7 Added sin cos table implementation for dlsim 
- Sin and Cos values are obtained from a table with a resolution of
  100.
- dlsim is updated to use this table for phase noise.
 2020-11-03 11:26:37 +01:00
Parminder Singh b288eafd1e Common Phase error estimation and compensation in uplink. 
FEATURE STATEMENT:
- Introduce linear phase error noise model in Uplink at UE
- Perform common phase error (CPE) estimation and compensation at gNB

SOLUTION:
- A linear phase shift model is introduced in simulation.
- PTRS symbols are used to perform estimation of CPE from DMRS compensated signal
- The estimated values are interpolated in time domain and signal is compensated for the CPE.
- PTRS processing is done in Frequency Domain for each symbol in a slot and
  LLR's are calculated for each symbol accordingly.

IMPLEMENTATION:
* sim.h/channle_sim.c
- Linear Phase Noise Generation model definition.
* nr_ul_channel_estimation.c/nr_ul_estimation.h
- CPE estimation from PTRS and DMRS compensated signal.
* nr_dmrs_rx.c/nr_refsig.h
- Regenerate PTRS symbols at gNB.
* nr_ulsch_demodulation.c
- Removed old PTRS processing code and move to a common PTRS processing function
* defs_gNB.h/init.c
- New PTRS variables definition and initialization
* nr_ulsch_ue.c
- Corrected PTRS parameter to get new PTRS symbols for each OFDM symbol

TESTING
* ulsim.c
- Added Phase noise, Enable PTRS signal and verified the output.

VERIFICATION
- The LLR are rotated back with estimated CPE and no error is observed in scrambling/decoding
 2020-08-27 11:55:06 +02:00