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    • Parminder Singh's avatar
      Common Phase error estimation and compensation in uplink. · b288eafd
      Parminder Singh authored
      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
      b288eafd
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