move common SRS functions to common folder
This commit is contained in:
francescomani
@@ -941,6 +941,7 @@ set(PHY_SRC_UE
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${OPENAIR1_DIR}/PHY/NR_TRANSPORT/nr_tbs_tools.c
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${OPENAIR1_DIR}/PHY/NR_TRANSPORT/nr_prach_common.c
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${OPENAIR1_DIR}/PHY/nr_phy_common/src/nr_phy_common_csirs.c
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${OPENAIR1_DIR}/PHY/nr_phy_common/src/nr_phy_common_srs.c
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${OPENAIR1_DIR}/PHY/NR_TRANSPORT/nr_scrambling.c
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${OPENAIR1_DIR}/PHY/NR_REFSIG/refsig.c
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${OPENAIR1_DIR}/PHY/NR_UE_TRANSPORT/srs_modulation_nr.c
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@@ -78,7 +78,6 @@
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#define NR_N_SYMBOLS_SSB (4)
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#define IQ_SIZE sizeof(c16_t) /* I and Q are alternatively stored into buffers */
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#define N_SYMB_SLOT (14)
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/* SS/PBCH parameters : see from TS 38.211 table 7.4.3.1-1: Resources within an SS/PBCH block for PSS... */
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#define DMRS_PBCH_PER_RB (N_SC_RB >> 4) /* at 0+v, 4+v, 8+v for a resource block with v = NcellID modulo 4 */
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@@ -38,338 +38,8 @@
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#include "PHY/NR_REFSIG/ss_pbch_nr.h"
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#include "PHY/NR_REFSIG/dmrs_nr.h"
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#include "PHY/NR_REFSIG/ul_ref_seq_nr.h"
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#include "PHY/nr_phy_common/inc/nr_phy_common.h"
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#include "PHY/NR_UE_TRANSPORT/srs_modulation_nr.h"
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//#define SRS_DEBUG
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uint16_t group_number_hopping(int slot_number,
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uint8_t n_ID_SRS,
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uint8_t l0,
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uint8_t l_line) {
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// Pseudo-random sequence c(i) defined by TS 38.211 - Section 5.2.1
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uint32_t cinit = n_ID_SRS;
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uint8_t c_last_index = 8 * (slot_number * N_SYMB_SLOT + l0 + l_line) + 7;
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uint32_t *c_sequence = calloc(c_last_index+1, sizeof(uint32_t));
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pseudo_random_sequence(c_last_index+1, c_sequence, cinit);
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// TS 38.211 - 6.4.1.4.2 Sequence generation
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uint32_t f_gh = 0;
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for (int m = 0; m <= 7; m++) {
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f_gh += c_sequence[8 * (slot_number * N_SYMB_SLOT + l0 + l_line) + m] << m;
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}
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f_gh = f_gh%30;
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uint8_t u = (f_gh + n_ID_SRS)%U_GROUP_NUMBER;
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free(c_sequence);
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return u;
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}
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uint16_t sequence_number_hopping(int slot_number,
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uint8_t n_ID_SRS,
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uint16_t M_sc_b_SRS,
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uint8_t l0,
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uint8_t l_line) {
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uint16_t v = 0;
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if (M_sc_b_SRS > 6 * NR_NB_SC_PER_RB) {
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// Pseudo-random sequence c(i) defined by TS 38.211 - Section 5.2.1
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uint32_t cinit = n_ID_SRS;
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uint8_t c_last_index = (slot_number * N_SYMB_SLOT + l0 + l_line);
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uint32_t *c_sequence = calloc(c_last_index+1, sizeof(uint32_t));
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pseudo_random_sequence(c_last_index+1, c_sequence, cinit);
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// TS 38.211 - 6.4.1.4.2 Sequence generation
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v = c_sequence[c_last_index];
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free(c_sequence);
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}
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return v;
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}
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static int compute_F_b(frame_t frame_number,
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slot_t slot_number,
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int slots_per_frame,
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nr_srs_info_t *nr_srs_info,
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uint8_t l_line,
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uint8_t b)
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{
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// Compute the number of SRS transmissions
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uint16_t n_SRS = 0;
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if (nr_srs_info->resource_type == aperiodic) {
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n_SRS = l_line / nr_srs_info->R;
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} else {
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int t = (slots_per_frame * frame_number + slot_number - nr_srs_info->T_offset) / nr_srs_info->T_SRS;
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n_SRS = t * (nr_srs_info->N_symb_SRS / nr_srs_info->R) + (l_line / nr_srs_info->R);
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}
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uint16_t product_N_b = 1;
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for (unsigned int b_prime = nr_srs_info->b_hop; b_prime < nr_srs_info->B_SRS; b_prime++) {
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if (b_prime != nr_srs_info->b_hop) {
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product_N_b *= get_N_b_srs(nr_srs_info->C_SRS, b_prime);
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}
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}
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int F_b = 0;
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uint8_t N_b = get_N_b_srs(nr_srs_info->C_SRS, b);
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if (N_b & 1) { // Nb odd
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F_b = (N_b / 2) * (n_SRS / product_N_b);
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} else { // Nb even
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uint16_t product_N_b_B_SRS = product_N_b;
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product_N_b_B_SRS *= get_N_b_srs(nr_srs_info->C_SRS, nr_srs_info->B_SRS); /* product for b_hop to b */
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F_b = (N_b / 2) * ((n_SRS % product_N_b_B_SRS) / product_N_b) + ((n_SRS % product_N_b_B_SRS) / 2 * product_N_b);
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}
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return F_b;
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}
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static int compute_n_b(frame_t frame_number,
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slot_t slot_number,
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uint16_t slots_per_frame,
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nr_srs_info_t *nr_srs_info,
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uint8_t l_line,
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uint8_t b,
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int m_SRS_b)
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{
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uint8_t N_b = get_N_b_srs(nr_srs_info->C_SRS, b);
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int n_b = 0;
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if (nr_srs_info->b_hop >= nr_srs_info->B_SRS) {
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n_b = (4 * nr_srs_info->n_RRC / m_SRS_b) % N_b;
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} else {
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if (b <= nr_srs_info->b_hop) {
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n_b = (4 * nr_srs_info->n_RRC / m_SRS_b) % N_b;
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} else {
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// Compute the hopping offset Fb
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int F_b = compute_F_b(frame_number, slot_number, slots_per_frame, nr_srs_info, l_line, b);
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n_b = (F_b + (4 * nr_srs_info->n_RRC / m_SRS_b)) % N_b;
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}
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}
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return n_b;
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}
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/*************************************************************************
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*
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* NAME : generate_srs_nr
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*
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* PARAMETERS : pointer to srs config pdu
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* pointer to transmit buffer
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* amplitude scaling for this physical signal
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* slot number of transmission
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* RETURN : 0 if srs sequence has been successfully generated
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* -1 if sequence can not be properly generated
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*
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* DESCRIPTION : generate/map srs symbol into transmit buffer
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* See TS 38.211 - Section 6.4.1.4 Sounding reference signal
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*
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***************************************************************************/
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int generate_srs_nr(NR_DL_FRAME_PARMS *frame_parms,
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c16_t **txdataF,
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uint16_t symbol_offset,
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int bwp_start,
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nr_srs_info_t *nr_srs_info,
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int16_t amp,
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frame_t frame_number,
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slot_t slot_number)
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{
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uint8_t K_TC = 2 << nr_srs_info->comb_size;
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/* Number of antenna ports (M) can't be higher than number of physical antennas (N): M <= N */
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int N_ap = nr_srs_info->n_srs_ports > frame_parms->nb_antennas_tx ? frame_parms->nb_antennas_tx : nr_srs_info->n_srs_ports;
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uint8_t l0 = frame_parms->symbols_per_slot - 1 - nr_srs_info->l_offset; // Starting symbol position in the time domain
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uint8_t n_SRS_cs_max = srs_max_number_cs[nr_srs_info->comb_size];
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int m_SRS_b = get_m_srs(nr_srs_info->C_SRS, nr_srs_info->B_SRS); // Number of resource blocks
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uint16_t M_sc_b_SRS = m_SRS_b * NR_NB_SC_PER_RB/K_TC; // Length of the SRS sequence
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#ifdef SRS_DEBUG
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LOG_I(NR_PHY,"Frame = %i, slot = %i\n", frame_number, slot_number);
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LOG_I(NR_PHY,"B_SRS = %i\n", nr_srs_info->B_SRS);
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LOG_I(NR_PHY,"C_SRS = %i\n", nr_srs_info->C_SRS);
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LOG_I(NR_PHY,"b_hop = %i\n", nr_srs_info->b_hop);
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LOG_I(NR_PHY,"K_TC = %i\n", K_TC);
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LOG_I(NR_PHY,"K_TC_overbar = %i\n", nr_srs_info->K_TC_overbar);
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LOG_I(NR_PHY,"n_SRS_cs = %i\n", nr_srs_info->n_SRS_cs);
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LOG_I(NR_PHY,"n_ID_SRS = %i\n", nr_srs_info->n_ID_SRS);
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LOG_I(NR_PHY,"n_shift = %i\n", nr_srs_info->n_shift);
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LOG_I(NR_PHY,"n_RRC = %i\n", nr_srs_info->n_RRC);
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LOG_I(NR_PHY,"groupOrSequenceHopping = %i\n", nr_srs_info->groupOrSequenceHopping);
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LOG_I(NR_PHY,"l_offset = %i\n", nr_srs_info->l_offset);
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LOG_I(NR_PHY,"T_SRS = %i\n", nr_srs_info->T_SRS);
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LOG_I(NR_PHY,"T_offset = %i\n", nr_srs_info->T_offset);
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LOG_I(NR_PHY,"R = %i\n", nr_srs_info->R);
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LOG_I(NR_PHY,"N_ap = %i\n", N_ap);
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LOG_I(NR_PHY,"N_symb_SRS = %i\n", nr_srs_info->N_symb_SRS);
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LOG_I(NR_PHY,"l0 = %i\n", l0);
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LOG_I(NR_PHY,"n_SRS_cs_max = %i\n", n_SRS_cs_max);
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LOG_I(NR_PHY,"m_SRS_b = %i\n", m_SRS_b);
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LOG_I(NR_PHY,"M_sc_b_SRS = %i\n", M_sc_b_SRS);
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#endif
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// Validation of SRS config parameters
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if (nr_srs_info->R == 0) {
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LOG_E(NR_PHY, "generate_srs: this parameter repetition factor %d is not consistent !\n", nr_srs_info->R);
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return -1;
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} else if (nr_srs_info->R > nr_srs_info->N_symb_SRS) {
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LOG_E(NR_PHY, "generate_srs: R %d can not be greater than N_symb_SRS %d !\n", nr_srs_info->R, nr_srs_info->N_symb_SRS);
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return -1;
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}
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if (nr_srs_info->n_SRS_cs >= n_SRS_cs_max) {
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LOG_E(NR_PHY, "generate_srs: inconsistent parameter n_SRS_cs %d >= n_SRS_cs_max %d !\n", nr_srs_info->n_SRS_cs, n_SRS_cs_max);
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return -1;
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}
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if (nr_srs_info->T_SRS == 0) {
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LOG_E(NR_PHY, "generate_srs: inconsistent parameter T_SRS %d can not be equal to zero !\n", nr_srs_info->T_SRS);
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return -1;
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} else {
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int index = 0;
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while (srs_periodicity[index] != nr_srs_info->T_SRS) {
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index++;
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if (index == SRS_PERIODICITY) {
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LOG_E(NR_PHY, "generate_srs: inconsistent parameter T_SRS %d not specified !\n", nr_srs_info->T_SRS);
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return -1;
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}
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}
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}
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// Variable initialization
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if(nr_srs_info) {
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nr_srs_info->srs_generated_signal_bits = log2_approx(amp);
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}
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uint64_t subcarrier_offset = frame_parms->first_carrier_offset + bwp_start * NR_NB_SC_PER_RB;
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double sqrt_N_ap = sqrt(N_ap);
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int n_b[nr_srs_info->B_SRS + 1];
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// Find index of table which is for this SRS length
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uint16_t M_sc_b_SRS_index = 0;
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while((ul_allocated_re[M_sc_b_SRS_index] != M_sc_b_SRS) && (M_sc_b_SRS_index < SRS_SB_CONF)){
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M_sc_b_SRS_index++;
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}
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// SRS sequence generation and mapping, TS 38.211 - Section 6.4.1.4
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for (int p_index = 0; p_index < N_ap; p_index++) {
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#ifdef SRS_DEBUG
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LOG_I(NR_PHY,"============ port %d ============\n", p_index);
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#endif
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uint16_t n_SRS_cs_i = (nr_srs_info->n_SRS_cs + (n_SRS_cs_max * (SRS_antenna_port[p_index] - 1000)/N_ap))%n_SRS_cs_max;
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double alpha_i = 2 * M_PI * ((double)n_SRS_cs_i / (double)n_SRS_cs_max);
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#ifdef SRS_DEBUG
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LOG_I(NR_PHY,"n_SRS_cs_i = %i\n", n_SRS_cs_i);
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LOG_I(NR_PHY,"alpha_i = %f\n", alpha_i);
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#endif
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for (int l_line = 0; l_line < nr_srs_info->N_symb_SRS; l_line++) {
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#ifdef SRS_DEBUG
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LOG_I(NR_PHY,":::::::: OFDM symbol %d ::::::::\n", l0+l_line);
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#endif
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// Set group and sequence numbers (u,v) per OFDM symbol
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uint16_t u = 0;
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uint16_t v = 0;
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switch(nr_srs_info->groupOrSequenceHopping) {
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case neitherHopping:
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u = nr_srs_info->n_ID_SRS % U_GROUP_NUMBER;
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v = 0;
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break;
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case groupHopping:
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u = group_number_hopping(slot_number, nr_srs_info->n_ID_SRS, l0, l_line);
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v = 0;
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break;
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case sequenceHopping:
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u = nr_srs_info->n_ID_SRS % U_GROUP_NUMBER;
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v = sequence_number_hopping(slot_number, nr_srs_info->n_ID_SRS, M_sc_b_SRS, l0, l_line);
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break;
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default:
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LOG_E(NR_PHY, "generate_srs: unknown hopping setting %d !\n", nr_srs_info->groupOrSequenceHopping);
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return -1;
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}
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#ifdef SRS_DEBUG
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LOG_I(NR_PHY,"u = %i\n", u);
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LOG_I(NR_PHY,"v = %i\n", v);
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#endif
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// Compute the frequency position index n_b
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uint16_t sum_n_b = 0;
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for (int b = 0; b <= nr_srs_info->B_SRS; b++) {
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n_b[b] = compute_n_b(frame_number, slot_number, frame_parms->slots_per_frame, nr_srs_info, l_line, b, m_SRS_b);
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sum_n_b += n_b[b];
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#ifdef SRS_DEBUG
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LOG_I(NR_PHY,"n_b[%i] = %i\n", b, n_b[b]);
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#endif
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}
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#ifdef SRS_DEBUG
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LOG_I(NR_PHY,"sum_n_b = %i\n", sum_n_b);
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#endif
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// Compute the frequency-domain starting position
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uint8_t K_TC_p = 0;
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if((nr_srs_info->n_SRS_cs >= n_SRS_cs_max/2)
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&& (nr_srs_info->n_SRS_cs < n_SRS_cs_max)
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&& (N_ap == 4)
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&& ((SRS_antenna_port[p_index] == 1001) || (SRS_antenna_port[p_index] == 1003))) {
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K_TC_p = (nr_srs_info->K_TC_overbar + K_TC/2)%K_TC;
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} else {
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K_TC_p = nr_srs_info->K_TC_overbar;
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}
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uint8_t k_l_offset = 0; // If the SRS is configured by the IE SRS-PosResource-r16, the quantity k_l_offset is
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// given by TS 38.211 - Table 6.4.1.4.3-2, otherwise k_l_offset = 0.
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uint8_t k_0_overbar_p = (nr_srs_info->n_shift * NR_NB_SC_PER_RB + (K_TC_p + k_l_offset)) % K_TC;
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uint8_t k_0_p = k_0_overbar_p + K_TC*M_sc_b_SRS*sum_n_b;
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nr_srs_info->k_0_p[p_index][l_line] = k_0_p;
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#ifdef SRS_DEBUG
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LOG_I(NR_PHY,"K_TC_p = %i\n", K_TC_p);
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LOG_I(NR_PHY,"k_0_overbar_p = %i\n", k_0_overbar_p);
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LOG_I(NR_PHY,"k_0_p = %i\n", k_0_p);
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#endif
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uint16_t subcarrier = subcarrier_offset + k_0_p;
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if (subcarrier>frame_parms->ofdm_symbol_size) {
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subcarrier -= frame_parms->ofdm_symbol_size;
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}
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uint16_t l_line_offset = l_line*frame_parms->ofdm_symbol_size;
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// For each port, and for each OFDM symbol, here it is computed and mapped an SRS sequence with M_sc_b_SRS symbols
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for (int k = 0; k < M_sc_b_SRS; k++) {
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cd_t shift = {cos(alpha_i * k), sin(alpha_i * k)};
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const c16_t tmp = rv_ul_ref_sig[u][v][M_sc_b_SRS_index][k];
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cd_t r_overbar = {tmp.r, tmp.i};
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// cos(x+y) = cos(x)cos(y) - sin(x)sin(y)
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cd_t r = cdMul(shift, r_overbar);
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c16_t r_amp = {(((int32_t)round((double)amp * r.r / sqrt_N_ap)) >> 15),
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(((int32_t)round((double)amp * r.i / sqrt_N_ap)) >> 15)};
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#ifdef SRS_DEBUG
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int subcarrier_log = subcarrier-subcarrier_offset;
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if(subcarrier_log < 0) {
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subcarrier_log = subcarrier_log + frame_parms->ofdm_symbol_size;
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}
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if(subcarrier_log%12 == 0) {
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LOG_I(NR_PHY,"------------ %d ------------\n", subcarrier_log/12);
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}
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LOG_I(NR_PHY, "(%d) \t%i\t%i\n", subcarrier_log, r_amp.r, r_amp.i);
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#endif
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txdataF[p_index][symbol_offset + l_line_offset + subcarrier] = r_amp;
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||||
|
||||
// Subcarrier increment
|
||||
subcarrier += K_TC;
|
||||
if (subcarrier >= frame_parms->ofdm_symbol_size) {
|
||||
subcarrier=subcarrier-frame_parms->ofdm_symbol_size;
|
||||
}
|
||||
|
||||
} // for (int k = 0; k < M_sc_b_SRS; k++)
|
||||
} // for (int l_line = 0; l_line < N_symb_SRS; l_line++)
|
||||
} // for (int p_index = 0; p_index < N_ap; p_index++)
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void configure_srs_info(fapi_nr_ul_config_srs_pdu *srs_config_pdu, nr_srs_info_t *nr_srs_info)
|
||||
{
|
||||
@@ -457,24 +127,16 @@ int ue_srs_procedures_nr(PHY_VARS_NR_UE *ue,
|
||||
NR_DL_FRAME_PARMS *frame_parms = &(ue->frame_parms);
|
||||
uint16_t symbol_offset = (frame_parms->symbols_per_slot - 1 - srs_config_pdu->time_start_position)*frame_parms->ofdm_symbol_size;
|
||||
|
||||
if (generate_srs_nr(frame_parms, txdataF, symbol_offset, srs_config_pdu->bwp_start, ue->nr_srs_info, AMP, proc->frame_tx, proc->nr_slot_tx)
|
||||
== 0) {
|
||||
if (generate_srs_nr(frame_parms,
|
||||
txdataF,
|
||||
symbol_offset,
|
||||
srs_config_pdu->bwp_start,
|
||||
ue->nr_srs_info,
|
||||
AMP,
|
||||
proc->frame_tx,
|
||||
proc->nr_slot_tx)) {
|
||||
return 0;
|
||||
} else {
|
||||
return -1;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
@@ -35,43 +35,8 @@
|
||||
|
||||
#include "PHY/defs_nr_UE.h"
|
||||
|
||||
#define SRS_PERIODICITY (17)
|
||||
|
||||
static const uint16_t srs_periodicity[SRS_PERIODICITY] = {1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 160, 320, 640, 1280, 2560};
|
||||
|
||||
// TS 38.211 - Table 6.4.1.4.2-1
|
||||
static const uint16_t srs_max_number_cs[3] = {8, 12, 6};
|
||||
|
||||
/*************** FUNCTIONS *****************************************/
|
||||
|
||||
/** \brief This function generates the sounding reference symbol (SRS) for the uplink according to 38.211 6.4.1.4 Sounding reference signal
|
||||
@param frame_parms NR DL Frame parameters
|
||||
@param txdataF pointer to the frequency domain TX signal
|
||||
@param symbol_offset symbol offset added in txdataF
|
||||
@param nr_srs_info pointer to the srs info structure
|
||||
@param amp amplitude of generated signal
|
||||
@param frame_number frame number
|
||||
@param slot_number slot number
|
||||
@returns 0 on success -1 on error with message */
|
||||
|
||||
int generate_srs_nr(NR_DL_FRAME_PARMS *frame_parms,
|
||||
c16_t **txdataF,
|
||||
uint16_t symbol_offset,
|
||||
int bwp_start,
|
||||
nr_srs_info_t *nr_srs_info,
|
||||
int16_t amp,
|
||||
frame_t frame_number,
|
||||
slot_t slot_number);
|
||||
|
||||
/** \brief This function checks for periodic srs if srs should be transmitted in this slot
|
||||
* @param p_SRS_Resource pointer to active resource
|
||||
@param frame_parms NR DL Frame parameters
|
||||
@param txdataF pointer to the frequency domain TX signal
|
||||
@returns 0 if srs should be transmitted -1 on error with message */
|
||||
|
||||
int is_srs_period_nr(SRS_Resource_t *p_SRS_Resource,
|
||||
NR_DL_FRAME_PARMS *frame_parms,
|
||||
int frame_tx, int slot_tx);
|
||||
|
||||
/** \brief This function processes srs configuration
|
||||
* @param ue context
|
||||
|
||||
@@ -364,6 +364,14 @@ void nr_channel_level(const int symbol,
|
||||
const int Nl,
|
||||
int32_t avg[nb_rx * Nl],
|
||||
const uint32_t len);
|
||||
bool generate_srs_nr(NR_DL_FRAME_PARMS *frame_parms,
|
||||
c16_t **txdataF,
|
||||
uint16_t symbol_offset,
|
||||
int bwp_start,
|
||||
nr_srs_info_t *nr_srs_info,
|
||||
int16_t amp,
|
||||
frame_t frame_number,
|
||||
slot_t slot_number);
|
||||
void nr_generate_csi_rs(const NR_DL_FRAME_PARMS *frame_parms,
|
||||
const csi_mapping_parms_t *phy_csi_parms,
|
||||
const int16_t amp,
|
||||
|
||||
@@ -0,0 +1,344 @@
|
||||
/*
|
||||
* Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
|
||||
* contributor license agreements. See the NOTICE file distributed with
|
||||
* this work for additional information regarding copyright ownership.
|
||||
* The OpenAirInterface Software Alliance licenses this file to You under
|
||||
* the OAI Public License, Version 1.1 (the "License"); you may not use this file
|
||||
* except in compliance with the License.
|
||||
* You may obtain a copy of the License at
|
||||
*
|
||||
* http://www.openairinterface.org/?page_id=698
|
||||
*
|
||||
* Unless required by applicable law or agreed to in writing, software
|
||||
* distributed under the License is distributed on an "AS IS" BASIS,
|
||||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
* See the License for the specific language governing permissions and
|
||||
* limitations under the License.
|
||||
*-------------------------------------------------------------------------------
|
||||
* For more information about the OpenAirInterface (OAI) Software Alliance:
|
||||
* contact@openairinterface.org
|
||||
*/
|
||||
|
||||
#include "PHY/nr_phy_common/inc/nr_phy_common.h"
|
||||
#include "PHY/NR_REFSIG/dmrs_nr.h"
|
||||
#include "PHY/NR_REFSIG/ul_ref_seq_nr.h"
|
||||
|
||||
#define SRS_PERIODICITY (17)
|
||||
static const uint16_t srs_periodicity[SRS_PERIODICITY] = {1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 160, 320, 640, 1280, 2560};
|
||||
// TS 38.211 - Table 6.4.1.4.2-1
|
||||
static const uint16_t srs_max_number_cs[3] = {8, 12, 6};
|
||||
|
||||
//#define SRS_DEBUG
|
||||
|
||||
static int group_number_hopping(int slot_number, uint8_t n_ID_SRS, uint8_t l0, uint8_t l_line)
|
||||
{
|
||||
// Pseudo-random sequence c(i) defined by TS 38.211 - Section 5.2.1
|
||||
uint32_t cinit = n_ID_SRS;
|
||||
uint8_t c_last_index = 8 * (slot_number * NR_SYMBOLS_PER_SLOT + l0 + l_line) + 7;
|
||||
uint32_t *c_sequence = calloc(c_last_index + 1, sizeof(uint32_t));
|
||||
pseudo_random_sequence(c_last_index + 1, c_sequence, cinit);
|
||||
|
||||
// TS 38.211 - 6.4.1.4.2 Sequence generation
|
||||
uint32_t f_gh = 0;
|
||||
for (int m = 0; m <= 7; m++) {
|
||||
f_gh += c_sequence[8 * (slot_number * NR_SYMBOLS_PER_SLOT + l0 + l_line) + m] << m;
|
||||
}
|
||||
f_gh = f_gh % 30;
|
||||
int u = (f_gh + n_ID_SRS) % U_GROUP_NUMBER;
|
||||
free(c_sequence);
|
||||
return u;
|
||||
}
|
||||
|
||||
static int sequence_number_hopping(int slot_number, uint8_t n_ID_SRS, uint16_t M_sc_b_SRS, uint8_t l0, uint8_t l_line)
|
||||
{
|
||||
int v = 0;
|
||||
if (M_sc_b_SRS > 6 * NR_NB_SC_PER_RB) {
|
||||
// Pseudo-random sequence c(i) defined by TS 38.211 - Section 5.2.1
|
||||
uint32_t cinit = n_ID_SRS;
|
||||
uint8_t c_last_index = (slot_number * NR_SYMBOLS_PER_SLOT + l0 + l_line);
|
||||
uint32_t *c_sequence = calloc(c_last_index + 1, sizeof(uint32_t));
|
||||
pseudo_random_sequence(c_last_index + 1, c_sequence, cinit);
|
||||
// TS 38.211 - 6.4.1.4.2 Sequence generation
|
||||
v = c_sequence[c_last_index];
|
||||
free(c_sequence);
|
||||
}
|
||||
return v;
|
||||
}
|
||||
|
||||
static int compute_F_b(frame_t frame_number,
|
||||
slot_t slot_number,
|
||||
int slots_per_frame,
|
||||
nr_srs_info_t *nr_srs_info,
|
||||
uint8_t l_line,
|
||||
uint8_t b)
|
||||
{
|
||||
// Compute the number of SRS transmissions
|
||||
uint16_t n_SRS = 0;
|
||||
if (nr_srs_info->resource_type == aperiodic) {
|
||||
n_SRS = l_line / nr_srs_info->R;
|
||||
} else {
|
||||
int t = (slots_per_frame * frame_number + slot_number - nr_srs_info->T_offset) / nr_srs_info->T_SRS;
|
||||
n_SRS = t * (nr_srs_info->N_symb_SRS / nr_srs_info->R) + (l_line / nr_srs_info->R);
|
||||
}
|
||||
|
||||
uint16_t product_N_b = 1;
|
||||
for (unsigned int b_prime = nr_srs_info->b_hop; b_prime < nr_srs_info->B_SRS; b_prime++) {
|
||||
if (b_prime != nr_srs_info->b_hop) {
|
||||
product_N_b *= get_N_b_srs(nr_srs_info->C_SRS, b_prime);
|
||||
}
|
||||
}
|
||||
|
||||
int F_b = 0;
|
||||
uint8_t N_b = get_N_b_srs(nr_srs_info->C_SRS, b);
|
||||
if (N_b & 1) { // Nb odd
|
||||
F_b = (N_b / 2) * (n_SRS / product_N_b);
|
||||
} else { // Nb even
|
||||
uint16_t product_N_b_B_SRS = product_N_b;
|
||||
product_N_b_B_SRS *= get_N_b_srs(nr_srs_info->C_SRS, nr_srs_info->B_SRS); /* product for b_hop to b */
|
||||
F_b = (N_b / 2) * ((n_SRS % product_N_b_B_SRS) / product_N_b) + ((n_SRS % product_N_b_B_SRS) / 2 * product_N_b);
|
||||
}
|
||||
return F_b;
|
||||
}
|
||||
|
||||
static int compute_n_b(frame_t frame_number,
|
||||
slot_t slot_number,
|
||||
uint16_t slots_per_frame,
|
||||
nr_srs_info_t *nr_srs_info,
|
||||
uint8_t l_line,
|
||||
uint8_t b,
|
||||
int m_SRS_b)
|
||||
{
|
||||
uint8_t N_b = get_N_b_srs(nr_srs_info->C_SRS, b);
|
||||
int n_b = 0;
|
||||
if (nr_srs_info->b_hop >= nr_srs_info->B_SRS) {
|
||||
n_b = (4 * nr_srs_info->n_RRC / m_SRS_b) % N_b;
|
||||
} else {
|
||||
if (b <= nr_srs_info->b_hop) {
|
||||
n_b = (4 * nr_srs_info->n_RRC / m_SRS_b) % N_b;
|
||||
} else {
|
||||
// Compute the hopping offset Fb
|
||||
int F_b = compute_F_b(frame_number, slot_number, slots_per_frame, nr_srs_info, l_line, b);
|
||||
n_b = (F_b + (4 * nr_srs_info->n_RRC / m_SRS_b)) % N_b;
|
||||
}
|
||||
}
|
||||
return n_b;
|
||||
}
|
||||
|
||||
/*************************************************************************
|
||||
*
|
||||
* NAME : generate_srs_nr
|
||||
*
|
||||
* PARAMETERS : pointer to srs config pdu
|
||||
* pointer to transmit buffer
|
||||
* amplitude scaling for this physical signal
|
||||
* slot number of transmission
|
||||
* RETURN : 0 if srs sequence has been successfully generated
|
||||
* -1 if sequence can not be properly generated
|
||||
*
|
||||
* DESCRIPTION : generate/map srs symbol into transmit buffer
|
||||
* See TS 38.211 - Section 6.4.1.4 Sounding reference signal
|
||||
*
|
||||
***************************************************************************/
|
||||
bool generate_srs_nr(NR_DL_FRAME_PARMS *frame_parms,
|
||||
c16_t **txdataF,
|
||||
uint16_t symbol_offset,
|
||||
int bwp_start,
|
||||
nr_srs_info_t *nr_srs_info,
|
||||
int16_t amp,
|
||||
frame_t frame_number,
|
||||
slot_t slot_number)
|
||||
{
|
||||
uint8_t K_TC = 2 << nr_srs_info->comb_size;
|
||||
/* Number of antenna ports (M) can't be higher than number of physical antennas (N): M <= N */
|
||||
int N_ap = nr_srs_info->n_srs_ports > frame_parms->nb_antennas_tx ? frame_parms->nb_antennas_tx : nr_srs_info->n_srs_ports;
|
||||
uint8_t l0 = frame_parms->symbols_per_slot - 1 - nr_srs_info->l_offset; // Starting symbol position in the time domain
|
||||
uint8_t n_SRS_cs_max = srs_max_number_cs[nr_srs_info->comb_size];
|
||||
int m_SRS_b = get_m_srs(nr_srs_info->C_SRS, nr_srs_info->B_SRS); // Number of resource blocks
|
||||
uint16_t M_sc_b_SRS = m_SRS_b * NR_NB_SC_PER_RB/K_TC; // Length of the SRS sequence
|
||||
|
||||
#ifdef SRS_DEBUG
|
||||
LOG_I(NR_PHY,"Frame = %i, slot = %i\n", frame_number, slot_number);
|
||||
LOG_I(NR_PHY,"B_SRS = %i\n", nr_srs_info->B_SRS);
|
||||
LOG_I(NR_PHY,"C_SRS = %i\n", nr_srs_info->C_SRS);
|
||||
LOG_I(NR_PHY,"b_hop = %i\n", nr_srs_info->b_hop);
|
||||
LOG_I(NR_PHY,"K_TC = %i\n", K_TC);
|
||||
LOG_I(NR_PHY,"K_TC_overbar = %i\n", nr_srs_info->K_TC_overbar);
|
||||
LOG_I(NR_PHY,"n_SRS_cs = %i\n", nr_srs_info->n_SRS_cs);
|
||||
LOG_I(NR_PHY,"n_ID_SRS = %i\n", nr_srs_info->n_ID_SRS);
|
||||
LOG_I(NR_PHY,"n_shift = %i\n", nr_srs_info->n_shift);
|
||||
LOG_I(NR_PHY,"n_RRC = %i\n", nr_srs_info->n_RRC);
|
||||
LOG_I(NR_PHY,"groupOrSequenceHopping = %i\n", nr_srs_info->groupOrSequenceHopping);
|
||||
LOG_I(NR_PHY,"l_offset = %i\n", nr_srs_info->l_offset);
|
||||
LOG_I(NR_PHY,"T_SRS = %i\n", nr_srs_info->T_SRS);
|
||||
LOG_I(NR_PHY,"T_offset = %i\n", nr_srs_info->T_offset);
|
||||
LOG_I(NR_PHY,"R = %i\n", nr_srs_info->R);
|
||||
LOG_I(NR_PHY,"N_ap = %i\n", N_ap);
|
||||
LOG_I(NR_PHY,"N_symb_SRS = %i\n", nr_srs_info->N_symb_SRS);
|
||||
LOG_I(NR_PHY,"l0 = %i\n", l0);
|
||||
LOG_I(NR_PHY,"n_SRS_cs_max = %i\n", n_SRS_cs_max);
|
||||
LOG_I(NR_PHY,"m_SRS_b = %i\n", m_SRS_b);
|
||||
LOG_I(NR_PHY,"M_sc_b_SRS = %i\n", M_sc_b_SRS);
|
||||
#endif
|
||||
|
||||
// Validation of SRS config parameters
|
||||
|
||||
if (nr_srs_info->R == 0) {
|
||||
LOG_E(NR_PHY, "generate_srs: this parameter repetition factor %d is not consistent !\n", nr_srs_info->R);
|
||||
return false;
|
||||
} else if (nr_srs_info->R > nr_srs_info->N_symb_SRS) {
|
||||
LOG_E(NR_PHY, "generate_srs: R %d can not be greater than N_symb_SRS %d !\n", nr_srs_info->R, nr_srs_info->N_symb_SRS);
|
||||
return false;
|
||||
}
|
||||
|
||||
if (nr_srs_info->n_SRS_cs >= n_SRS_cs_max) {
|
||||
LOG_E(NR_PHY, "generate_srs: inconsistent parameter n_SRS_cs %d >= n_SRS_cs_max %d !\n", nr_srs_info->n_SRS_cs, n_SRS_cs_max);
|
||||
return false;
|
||||
}
|
||||
|
||||
if (nr_srs_info->T_SRS == 0) {
|
||||
LOG_E(NR_PHY, "generate_srs: inconsistent parameter T_SRS %d can not be equal to zero !\n", nr_srs_info->T_SRS);
|
||||
return false;
|
||||
} else {
|
||||
int index = 0;
|
||||
while (srs_periodicity[index] != nr_srs_info->T_SRS) {
|
||||
index++;
|
||||
if (index == SRS_PERIODICITY) {
|
||||
LOG_E(NR_PHY, "generate_srs: inconsistent parameter T_SRS %d not specified !\n", nr_srs_info->T_SRS);
|
||||
return false;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Variable initialization
|
||||
if(nr_srs_info) {
|
||||
nr_srs_info->srs_generated_signal_bits = log2_approx(amp);
|
||||
}
|
||||
uint64_t subcarrier_offset = frame_parms->first_carrier_offset + bwp_start * NR_NB_SC_PER_RB;
|
||||
double sqrt_N_ap = sqrt(N_ap);
|
||||
int n_b[nr_srs_info->B_SRS + 1];
|
||||
|
||||
// Find index of table which is for this SRS length
|
||||
uint16_t M_sc_b_SRS_index = 0;
|
||||
while((ul_allocated_re[M_sc_b_SRS_index] != M_sc_b_SRS) && (M_sc_b_SRS_index < SRS_SB_CONF))
|
||||
M_sc_b_SRS_index++;
|
||||
|
||||
// SRS sequence generation and mapping, TS 38.211 - Section 6.4.1.4
|
||||
for (int p_index = 0; p_index < N_ap; p_index++) {
|
||||
#ifdef SRS_DEBUG
|
||||
LOG_I(NR_PHY,"============ port %d ============\n", p_index);
|
||||
#endif
|
||||
|
||||
uint16_t n_SRS_cs_i = (nr_srs_info->n_SRS_cs + (n_SRS_cs_max * (SRS_antenna_port[p_index] - 1000) / N_ap)) % n_SRS_cs_max;
|
||||
double alpha_i = 2 * M_PI * ((double)n_SRS_cs_i / (double)n_SRS_cs_max);
|
||||
|
||||
#ifdef SRS_DEBUG
|
||||
LOG_I(NR_PHY,"n_SRS_cs_i = %i\n", n_SRS_cs_i);
|
||||
LOG_I(NR_PHY,"alpha_i = %f\n", alpha_i);
|
||||
#endif
|
||||
|
||||
for (int l_line = 0; l_line < nr_srs_info->N_symb_SRS; l_line++) {
|
||||
#ifdef SRS_DEBUG
|
||||
LOG_I(NR_PHY,":::::::: OFDM symbol %d ::::::::\n", l0+l_line);
|
||||
#endif
|
||||
|
||||
// Set group and sequence numbers (u,v) per OFDM symbol
|
||||
int u = 0, v = 0;
|
||||
switch(nr_srs_info->groupOrSequenceHopping) {
|
||||
case neitherHopping:
|
||||
u = nr_srs_info->n_ID_SRS % U_GROUP_NUMBER;
|
||||
v = 0;
|
||||
break;
|
||||
case groupHopping:
|
||||
u = group_number_hopping(slot_number, nr_srs_info->n_ID_SRS, l0, l_line);
|
||||
v = 0;
|
||||
break;
|
||||
case sequenceHopping:
|
||||
u = nr_srs_info->n_ID_SRS % U_GROUP_NUMBER;
|
||||
v = sequence_number_hopping(slot_number, nr_srs_info->n_ID_SRS, M_sc_b_SRS, l0, l_line);
|
||||
break;
|
||||
default:
|
||||
LOG_E(NR_PHY, "generate_srs: unknown hopping setting %d !\n", nr_srs_info->groupOrSequenceHopping);
|
||||
return false;
|
||||
}
|
||||
|
||||
#ifdef SRS_DEBUG
|
||||
LOG_I(NR_PHY,"u = %i\n", u);
|
||||
LOG_I(NR_PHY,"v = %i\n", v);
|
||||
#endif
|
||||
|
||||
// Compute the frequency position index n_b
|
||||
uint16_t sum_n_b = 0;
|
||||
for (int b = 0; b <= nr_srs_info->B_SRS; b++) {
|
||||
n_b[b] = compute_n_b(frame_number, slot_number, frame_parms->slots_per_frame, nr_srs_info, l_line, b, m_SRS_b);
|
||||
sum_n_b += n_b[b];
|
||||
|
||||
#ifdef SRS_DEBUG
|
||||
LOG_I(NR_PHY,"n_b[%i] = %i\n", b, n_b[b]);
|
||||
#endif
|
||||
}
|
||||
|
||||
#ifdef SRS_DEBUG
|
||||
LOG_I(NR_PHY,"sum_n_b = %i\n", sum_n_b);
|
||||
#endif
|
||||
|
||||
// Compute the frequency-domain starting position
|
||||
uint8_t K_TC_p = 0;
|
||||
if((nr_srs_info->n_SRS_cs >= n_SRS_cs_max / 2)
|
||||
&& (nr_srs_info->n_SRS_cs < n_SRS_cs_max)
|
||||
&& (N_ap == 4)
|
||||
&& ((SRS_antenna_port[p_index] == 1001) || (SRS_antenna_port[p_index] == 1003))) {
|
||||
K_TC_p = (nr_srs_info->K_TC_overbar + K_TC / 2) % K_TC;
|
||||
} else {
|
||||
K_TC_p = nr_srs_info->K_TC_overbar;
|
||||
}
|
||||
uint8_t k_l_offset = 0; // If the SRS is configured by the IE SRS-PosResource-r16, the quantity k_l_offset is
|
||||
// given by TS 38.211 - Table 6.4.1.4.3-2, otherwise k_l_offset = 0.
|
||||
uint8_t k_0_overbar_p = (nr_srs_info->n_shift * NR_NB_SC_PER_RB + (K_TC_p + k_l_offset)) % K_TC;
|
||||
uint8_t k_0_p = k_0_overbar_p + K_TC * M_sc_b_SRS * sum_n_b;
|
||||
nr_srs_info->k_0_p[p_index][l_line] = k_0_p;
|
||||
|
||||
#ifdef SRS_DEBUG
|
||||
LOG_I(NR_PHY,"K_TC_p = %i\n", K_TC_p);
|
||||
LOG_I(NR_PHY,"k_0_overbar_p = %i\n", k_0_overbar_p);
|
||||
LOG_I(NR_PHY,"k_0_p = %i\n", k_0_p);
|
||||
#endif
|
||||
|
||||
uint16_t subcarrier = subcarrier_offset + k_0_p;
|
||||
if (subcarrier>frame_parms->ofdm_symbol_size)
|
||||
subcarrier -= frame_parms->ofdm_symbol_size;
|
||||
uint16_t l_line_offset = l_line * frame_parms->ofdm_symbol_size;
|
||||
// For each port, and for each OFDM symbol, here it is computed and mapped an SRS sequence with M_sc_b_SRS symbols
|
||||
for (int k = 0; k < M_sc_b_SRS; k++) {
|
||||
cd_t shift = {cos(alpha_i * k), sin(alpha_i * k)};
|
||||
const c16_t tmp = rv_ul_ref_sig[u][v][M_sc_b_SRS_index][k];
|
||||
cd_t r_overbar = {tmp.r, tmp.i};
|
||||
|
||||
// cos(x+y) = cos(x)cos(y) - sin(x)sin(y)
|
||||
cd_t r = cdMul(shift, r_overbar);
|
||||
c16_t r_amp = {(((int32_t)round((double)amp * r.r / sqrt_N_ap)) >> 15),
|
||||
(((int32_t)round((double)amp * r.i / sqrt_N_ap)) >> 15)};
|
||||
|
||||
#ifdef SRS_DEBUG
|
||||
int subcarrier_log = subcarrier-subcarrier_offset;
|
||||
if(subcarrier_log < 0) {
|
||||
subcarrier_log = subcarrier_log + frame_parms->ofdm_symbol_size;
|
||||
}
|
||||
if(subcarrier_log%12 == 0) {
|
||||
LOG_I(NR_PHY,"------------ %d ------------\n", subcarrier_log/12);
|
||||
}
|
||||
LOG_I(NR_PHY, "(%d) \t%i\t%i\n", subcarrier_log, r_amp.r, r_amp.i);
|
||||
#endif
|
||||
|
||||
txdataF[p_index][symbol_offset + l_line_offset + subcarrier] = r_amp;
|
||||
|
||||
// Subcarrier increment
|
||||
subcarrier += K_TC;
|
||||
if (subcarrier >= frame_parms->ofdm_symbol_size) {
|
||||
subcarrier=subcarrier-frame_parms->ofdm_symbol_size;
|
||||
}
|
||||
|
||||
} // for (int k = 0; k < M_sc_b_SRS; k++)
|
||||
} // for (int l_line = 0; l_line < N_symb_SRS; l_line++)
|
||||
} // for (int p_index = 0; p_index < N_ap; p_index++)
|
||||
return true;
|
||||
}
|
||||
@@ -32,7 +32,6 @@
|
||||
#include "common/utils/LOG/vcd_signal_dumper.h"
|
||||
#include "PHY/INIT/nr_phy_init.h"
|
||||
#include "PHY/MODULATION/nr_modulation.h"
|
||||
#include "PHY/NR_UE_TRANSPORT/srs_modulation_nr.h"
|
||||
#include "T.h"
|
||||
#include "executables/nr-softmodem.h"
|
||||
#include "executables/softmodem-common.h"
|
||||
|
||||
Reference in New Issue
Block a user