Added PTRS related definitions and variables for DL processing in UE

- Added PTRS variables in transport UE header file
- Added DMRS inline symbol check function in refsig.h
- Added PTRS estimation and other related structures in defs_nr_UE.h file

openair1/PHY/NR_REFSIG/nr_refsig.h

@@ -56,7 +56,9 @@ void nr_gen_ref_conj_symbols(uint32_t *in, uint32_t length, int16_t *output, uin
 uint8_t get_next_dmrs_symbol_in_slot(uint16_t  ul_dmrs_symb_pos, uint8_t counter, uint8_t end_symbol);
 uint8_t get_dmrs_symbols_in_slot(uint16_t l_prime_mask,  uint16_t nb_symb);
 
+
 void nr_generate_modulation_table(void);
+static inline uint8_t is_dmrs_symbol(uint8_t l, uint16_t dmrsSymbMask ) { return ((dmrsSymbMask >> l) & 0x1); }
 
 extern __m64 byte2m64_re[256];
 extern __m64 byte2m64_im[256];

openair1/PHY/NR_UE_TRANSPORT/nr_transport_ue.h

@@ -314,6 +314,19 @@ typedef struct {
   uint8_t codeword;
   /// HARQ-ACKs
   NR_UE_HARQ_STATUS_t harq_ack;
+  /// PTRS Frequency Density
+  uint8_t PTRSFreqDensity;
+  /// PTRS Time Density
+  uint8_t PTRSTimeDensity;
+  uint8_t PTRSPortIndex ;
+  uint8_t nEpreRatioOfPDSCHToPTRS;
+  uint8_t PTRSReOffset;
+  /// bit mask of PT-RS ofdm symbol indicies
+  uint16_t ptrs_symbols;
+  // PTRS symbol index, to be updated every PTRS symbol within a slot.
+  uint8_t ptrs_symbol_index;
+  /// PDU BITMAP 
+  uint16_t pduBitmap;
 } NR_DL_UE_HARQ_t;
 
 typedef struct {

openair1/PHY/defs_nr_UE.h

@@ -338,6 +338,10 @@ typedef struct {
   /// - first index: ? [0..7] (hard coded) FIXME! accessed via \c nb_antennas_rx
   /// - second index: ? [0..168*N_RB_DL[
   int32_t **dl_ch_estimates_ext;
+  /// \brief Downlink channel estimates extracted in PRBS.
+  /// - first index: ? [0..7] (hard coded) FIXME! accessed via \c nb_antennas_rx
+  /// - second index: ? [0..168*N_RB_DL[
+  int32_t **dl_ch_ptrs_estimates_ext;
   /// \brief Downlink cross-correlation of MIMO channel estimates (unquantized PMI) extracted in PRBS. For the SIC receiver we need to store the history of this for each harq process and round
   /// - first index: ? [0..7] (hard coded) accessed via \c harq_pid
   /// - second index: ? [0..7] (hard coded) accessed via \c round
@@ -414,6 +418,16 @@ typedef struct {
   uint32_t llr_offset[14];
   // llr length per ofdm symbol
   uint32_t llr_length[14];
+  // llr offset per ofdm symbol
+  uint32_t dl_valid_re[14];
+  /// \brief Estimated phase error based upon PTRS on each symbol .
+  /// - first index: ? [0..7] Number of Antenna
+  /// - second index: ? [0...14] smybol per slot
+  int32_t **ptrs_phase_per_slot;
+  /// \brief Estimated phase error based upon PTRS on each symbol .
+  /// - first index: ? [0..7] Number of Antenna
+  /// - second index: ? [0...14] smybol per slot
+  int32_t **ptrs_re_per_slot;
 } NR_UE_PDSCH;
 
 #define NR_PDCCH_DEFS_NR_UE
@@ -892,7 +906,7 @@ typedef struct {
   uint32_t nr_gold_pbch[2][64][NR_PBCH_DMRS_LENGTH_DWORD];
 
   /// PDSCH DMRS
-  uint32_t nr_gold_pdsch[2][20][14][NR_MAX_PDSCH_DMRS_INIT_LENGTH_DWORD];
+  uint32_t nr_gold_pdsch[2][20][14][NR_MAX_PDSCH_DMRS_INIT_LENGTH_DWORD];//sfn
 
   /// PDCCH DMRS
   uint32_t nr_gold_pdcch[7][20][3][52];