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
Problem STATEMENT:
- When enabling PTRS flag in ulsim, there are multiple scrambling and decoding errors
are observed even with high SNR values
SNR 60dB errors_scrambling 5546/13800
Channel BLER 1.000000e+00, Channel BER 4.018841e-01
ANALYSIS:
- While extracting PTRS RE's, the PUSCH RE count was not updated accordingly for PTRS symbols.
- This results in 0 value LLR's on same positions which cause offset issue in later processing.
IMPLEMENTATION:
* nr_ulsch_demodulation.c
- In case of PTRS symbol, respective total number of PTRS RE's are subtracted from available
PUSCH RE's in each PUSCH Symbol processing.
TESTING
* ulsim.c
- PTRS are enabled for testing and are not enabled by default by this commit.
- Available bit count is adjusted if PTRS is enabled.
VERIFICATION
- Total Scrambling errors after gNb processing shall be only 250 bits (in K=2)
which were replaced with PTRS at UE side while transmission.
SNR 60.000000 errors_scrambling 250/13800
Channel BLER 0.000000e+00, Channel BER 1.811594e-02
- After adjusting available bits in ulsim.c for error calculation
SNR 60.000000: n_errors errors_scrambling 0/13550
Channel BLER 0.000000e+00, Channel BER 0.000000e+00
EXTRA
- Removed white-spaces from all above mentioned files
- Added Global/vim tags to .gitignore file
Selects the UE with the highest CQI. If two UEs have the same CQI,
choses the one with highest number of bytes in RLC queue. Allocates as
many RBGs as possible, and potentially continues with the next UE.
Selects UE with highest coefficient. Allocates until there are no more
RBGs to allocate, or UE has no more data. In the latter case, continues
with the next UE (second-highest coefficient).
- Loop only to next UE instead of jumping multiple
- mark used RBGs in rbg_mask
- Only calculate number of RBs based on CQI when UE is selected, instead
of calculating for all UEs which might be unnecessary.
- When looping the list of UEs for RB allocation, remove UEs that have
no data anymore instead of skipping them.
The preprocessor pre-allocates a CCE. Thus, when arriving at the check
for the number of RBs for retransmission, it is too late to skip the UE.
Therefore, only print a warning.
The default schedulers allocate a correct amount of RBs for
retransmissions, therefore it is ok.
The test seemingly ensures that this code block is hit only once.
However, if we enable later activation of MMEs, it will be hit a second
(and third, ...) time. The only thing in guards against, though, is an
INIT message to the L1L2 thread, when register_enb_pending == 0, which
should only be sent once. Therefore, functionality won't be changed if
register_enb_pending becomes negative, and the assert can be removed.
Develop integration 2020 weeks 27/28
The following Merge Requests have been included:
* MR 842 : NR RRC HARQ hacks
* MR 843 : hack for RLC AM ACK reporting
* MR 844 : gcc warnings
* MR 846 : nr-rlc: small bugfix
* MR 848 : NR VCD
* MR 852 : bugfix: uplink ACK/NACK reporting through T was gone
* Documentation update
* Some CI improvements
When running the softmodem, we get the error:
fill_ulsch UE_id 0 nb_rb = 0
The code has changed some time ago and this log was left but is not
meaningful anymore.
Parminder Singh