65 lines
2.3 KiB
C
65 lines
2.3 KiB
C
#include "PHY/defs_gNB.h"
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#include "PHY/NR_TRANSPORT/nr_transport_proto.h"
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#include "PHY/LTE_REFSIG/lte_refsig.h"
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#include "PHY/NR_REFSIG/nr_refsig.h"
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#include "PHY/sse_intrin.h"
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#include "openair1/PHY/NR_REFSIG/refsig_defs_ue.h"
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#include "openair1/PHY/NR_REFSIG/nr_mod_table.h"
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//#define DEBUG_PRS_MOD
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//#define DEBUG_PRS_MAP
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int nr_generate_prs(int slot,
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c16_t *txdataF,
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int16_t amp,
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prs_config_t *prs_cfg,
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nfapi_nr_config_request_scf_t *config,
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NR_DL_FRAME_PARMS *frame_parms)
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{
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int k_prime = 0, k = 0, idx;
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c16_t mod_prs[NR_MAX_PRS_LENGTH];
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int16_t k_prime_table[K_PRIME_TABLE_ROW_SIZE][K_PRIME_TABLE_COL_SIZE] = PRS_K_PRIME_TABLE;
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// PRS resource mapping with combsize=k which means PRS symbols exist in every k-th subcarrier in frequency domain
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// According to ts138.211 sec.7.4.1.7.2
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for (int l = prs_cfg->SymbolStart; l < prs_cfg->SymbolStart + prs_cfg->NumPRSSymbols; l++) {
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int symInd = l-prs_cfg->SymbolStart;
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if (prs_cfg->CombSize == 2) {
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k_prime = k_prime_table[0][symInd];
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}
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else if (prs_cfg->CombSize == 4){
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k_prime = k_prime_table[1][symInd];
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}
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else if (prs_cfg->CombSize == 6){
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k_prime = k_prime_table[2][symInd];
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}
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else if (prs_cfg->CombSize == 12){
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k_prime = k_prime_table[3][symInd];
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}
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k = (prs_cfg->REOffset+k_prime) % prs_cfg->CombSize + prs_cfg->RBOffset*12 + frame_parms->first_carrier_offset;
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// QPSK modulation
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uint32_t *gold = nr_gold_prs(prs_cfg->NPRSID, slot, l);
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for (int m = 0; m < (12/prs_cfg->CombSize) * prs_cfg->NumRB; m++) {
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idx = (((gold[(m << 1) >> 5]) >> ((m << 1) & 0x1f)) & 3);
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mod_prs[m] = nr_qpsk_mod_table[idx];
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#ifdef DEBUG_PRS_MAP
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LOG_D("m %d at k %d of l %d reIdx %d\n", m, k, l, (l*frame_parms->ofdm_symbol_size + k)<<1);
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#endif
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txdataF[l * frame_parms->ofdm_symbol_size + k] = c16mulRealShift(mod_prs[m], amp, 15);
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k = k + prs_cfg->CombSize;
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if (k >= frame_parms->ofdm_symbol_size)
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k-=frame_parms->ofdm_symbol_size;
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}
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}
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#ifdef DEBUG_PRS_MAP
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LOG_M("nr_prs.m", "prs",(int16_t *)&txdataF[prs_cfg->SymbolStart*frame_parms->ofdm_symbol_size],prs_cfg->NumPRSSymbols*frame_parms->ofdm_symbol_size, 1, 1);
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#endif
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return 0;
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}
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