914 lines
39 KiB
C
914 lines
39 KiB
C
/*
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* Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The OpenAirInterface Software Alliance licenses this file to You under
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* the OAI Public License, Version 1.0 (the "License"); you may not use this file
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* except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.openairinterface.org/?page_id=698
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*-------------------------------------------------------------------------------
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* For more information about the OpenAirInterface (OAI) Software Alliance:
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* contact@openairinterface.org
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*/
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#include <string.h>
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#include "nr_ul_estimation.h"
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#include "PHY/sse_intrin.h"
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#include "PHY/NR_REFSIG/nr_refsig.h"
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#include "PHY/NR_REFSIG/dmrs_nr.h"
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#include "PHY/NR_REFSIG/ptrs_nr.h"
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#include "PHY/NR_TRANSPORT/nr_transport_proto.h"
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#include "PHY/NR_UE_TRANSPORT/srs_modulation_nr.h"
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#include "PHY/NR_UE_ESTIMATION/filt16a_32.h"
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#include "PHY/NR_REFSIG/ul_ref_seq_nr.h"
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#include "executables/softmodem-common.h"
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//#define DEBUG_CH
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//#define DEBUG_PUSCH
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//#define SRS_DEBUG
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#define NO_INTERP 1
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#define dBc(x,y) (dB_fixed(((int32_t)(x))*(x) + ((int32_t)(y))*(y)))
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__attribute__((always_inline)) inline c16_t c32x16cumulVectVectWithSteps(c16_t *in1,
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int *offset1,
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const int step1,
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c16_t *in2,
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int *offset2,
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const int step2,
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const int modulo2,
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const int N) {
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int localOffset1=*offset1;
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int localOffset2=*offset2;
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c32_t cumul={0};
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for (int i=0; i<N; i++) {
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cumul=c32x16maddShift(in1[localOffset1], in2[localOffset2], cumul, 15);
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localOffset1+=step1;
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localOffset2= (localOffset2 + step2) % modulo2;
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}
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*offset1=localOffset1;
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*offset2=localOffset2;
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return c16x32div(cumul, N);
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}
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int nr_pusch_channel_estimation(PHY_VARS_gNB *gNB,
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unsigned char Ns,
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unsigned short p,
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unsigned char symbol,
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int ul_id,
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unsigned short bwp_start_subcarrier,
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nfapi_nr_pusch_pdu_t *pusch_pdu,
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int *max_ch,
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uint32_t *nvar) {
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c16_t pilot[3280] __attribute__((aligned(32)));
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const int chest_freq = gNB->chest_freq;
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#ifdef DEBUG_CH
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FILE *debug_ch_est;
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debug_ch_est = fopen("debug_ch_est.txt","w");
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#endif
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//uint16_t Nid_cell = (eNB_offset == 0) ? gNB->frame_parms.Nid_cell : gNB->measurements.adj_cell_id[eNB_offset-1];
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NR_gNB_PUSCH *pusch_vars = &gNB->pusch_vars[ul_id];
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c16_t **ul_ch_estimates = (c16_t **)pusch_vars->ul_ch_estimates;
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const int symbolSize = gNB->frame_parms.ofdm_symbol_size;
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const int soffset = (Ns&3)*gNB->frame_parms.symbols_per_slot*symbolSize;
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const int nushift = (p>>1)&1;
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gNB->frame_parms.nushift = nushift;
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int ch_offset = symbolSize*symbol;
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const int symbol_offset = symbolSize*symbol;
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const int k0 = bwp_start_subcarrier;
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const int nb_rb_pusch = pusch_pdu->rb_size;
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LOG_D(PHY, "In %s: ch_offset %d, soffset %d, symbol_offset %d, OFDM size %d, Ns = %d, k0 = %d, symbol %d\n",
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__FUNCTION__,
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ch_offset, soffset,
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symbol_offset,
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symbolSize,
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Ns,
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k0,
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symbol);
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//------------------generate DMRS------------------//
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if(pusch_pdu->ul_dmrs_scrambling_id != gNB->pusch_gold_init[pusch_pdu->scid]) {
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gNB->pusch_gold_init[pusch_pdu->scid] = pusch_pdu->ul_dmrs_scrambling_id;
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nr_gold_pusch(gNB, pusch_pdu->scid, pusch_pdu->ul_dmrs_scrambling_id);
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}
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if (pusch_pdu->transform_precoding == transformPrecoder_disabled) {
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nr_pusch_dmrs_rx(gNB, Ns, gNB->nr_gold_pusch_dmrs[pusch_pdu->scid][Ns][symbol], (int32_t *)pilot, (1000+p), 0, nb_rb_pusch,
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(pusch_pdu->bwp_start + pusch_pdu->rb_start)*NR_NB_SC_PER_RB, pusch_pdu->dmrs_config_type);
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} else { // if transform precoding or SC-FDMA is enabled in Uplink
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// NR_SC_FDMA supports type1 DMRS so only 6 DMRS REs per RB possible
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const uint16_t index = get_index_for_dmrs_lowpapr_seq(nb_rb_pusch * (NR_NB_SC_PER_RB/2));
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const uint8_t u = pusch_pdu->dfts_ofdm.low_papr_group_number;
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const uint8_t v = pusch_pdu->dfts_ofdm.low_papr_sequence_number;
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int16_t *dmrs_seq = gNB_dmrs_lowpaprtype1_sequence[u][v][index];
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LOG_D(PHY,"Transform Precoding params. u: %d, v: %d, index for dmrsseq: %d\n", u, v, index);
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AssertFatal(index >= 0, "Num RBs not configured according to 3GPP 38.211 section 6.3.1.4. For PUSCH with transform precoding, num RBs cannot be multiple of any other primenumber other than 2,3,5\n");
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AssertFatal(dmrs_seq != NULL, "DMRS low PAPR seq not found, check if DMRS sequences are generated");
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nr_pusch_lowpaprtype1_dmrs_rx(gNB, Ns, dmrs_seq, (int32_t *)pilot, 1000, 0, nb_rb_pusch, 0, pusch_pdu->dmrs_config_type);
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#ifdef DEBUG_PUSCH
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printf ("NR_UL_CHANNEL_EST: index %d, u %d,v %d\n", index, u, v);
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LOG_M("gNb_DMRS_SEQ.m","gNb_DMRS_SEQ", dmrs_seq,6*nb_rb_pusch,1,1);
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#endif
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}
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//------------------------------------------------//
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#ifdef DEBUG_PUSCH
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for (int i = 0; i < (6 * nb_rb_pusch); i++) {
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LOG_I(PHY, "In %s: %d + j*(%d)\n", __FUNCTION__, pilot[i].r,pilot[i].i);
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}
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#endif
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int nest_count = 0;
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uint64_t noise_amp2 = 0;
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c16_t ul_ls_est[symbolSize] __attribute__((aligned(32)));
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memset(ul_ls_est, 0, sizeof(c16_t) * symbolSize);
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delay_t *delay = &gNB->ulsch[ul_id].delay;
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memset(delay, 0, sizeof(*delay));
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for (int aarx=0; aarx<gNB->frame_parms.nb_antennas_rx; aarx++) {
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c16_t *rxdataF = (c16_t *)&gNB->common_vars.rxdataF[aarx][symbol_offset];
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c16_t *ul_ch = &ul_ch_estimates[p*gNB->frame_parms.nb_antennas_rx+aarx][ch_offset];
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memset(ul_ch,0,sizeof(*ul_ch)*symbolSize);
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#ifdef DEBUG_PUSCH
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LOG_I(PHY, "In %s symbol_offset %d, nushift %d\n", __FUNCTION__, symbol_offset, nushift);
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LOG_I(PHY, "In %s ch est pilot, N_RB_UL %d\n", __FUNCTION__, gNB->frame_parms.N_RB_UL);
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LOG_I(PHY, "In %s bwp_start_subcarrier %d, k0 %d, first_carrier %d, nb_rb_pusch %d\n", __FUNCTION__, bwp_start_subcarrier, k0, gNB->frame_parms.first_carrier_offset, nb_rb_pusch);
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LOG_I(PHY, "In %s ul_ch addr %p nushift %d\n", __FUNCTION__, ul_ch, nushift);
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#endif
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if (pusch_pdu->dmrs_config_type == pusch_dmrs_type1 && chest_freq == 0) {
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c16_t *pil = pilot;
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int re_offset = k0;
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LOG_D(PHY,"PUSCH estimation DMRS type 1, Freq-domain interpolation");
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// For configuration type 1: k = 4*n + 2*k' + delta,
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// where k' is 0 or 1, and delta is in Table 6.4.1.1.3-1 from TS 38.211
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int pilot_cnt = 0;
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int delta = nr_pusch_dmrs_delta(pusch_dmrs_type1, p);
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for (int n = 0; n < 3 * nb_rb_pusch; n++) {
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// LS estimation
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c32_t ch = {0};
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for (int k_line = 0; k_line <= 1; k_line++) {
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re_offset = (k0 + (n << 2) + (k_line << 1) + delta) % symbolSize;
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ch = c32x16maddShift(*pil, rxdataF[soffset + re_offset], ch, 16);
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pil++;
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}
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c16_t ch16 = {.r = (int16_t)ch.r, .i = (int16_t)ch.i};
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*max_ch = max(*max_ch, max(abs(ch.r), abs(ch.i)));
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for (int k = pilot_cnt << 1; k < (pilot_cnt << 1) + 4; k++) {
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ul_ls_est[k] = ch16;
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}
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pilot_cnt += 2;
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}
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nr_est_delay(gNB->frame_parms.ofdm_symbol_size, ul_ls_est, (c16_t *)pusch_vars->ul_ch_estimates_time[aarx], delay);
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int delay_idx = get_delay_idx(delay->est_delay, MAX_DELAY_COMP);
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c16_t *ul_delay_table = gNB->frame_parms.delay_table[delay_idx];
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#ifdef DEBUG_PUSCH
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printf("Estimated delay = %i\n", delay->est_delay >> 1);
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#endif
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pilot_cnt = 0;
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for (int n = 0; n < 3*nb_rb_pusch; n++) {
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// Channel interpolation
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for (int k_line = 0; k_line <= 1; k_line++) {
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// Apply delay
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int k = pilot_cnt << 1;
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c16_t ch16 = c16mulShift(ul_ls_est[k], ul_delay_table[k], 8);
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#ifdef DEBUG_PUSCH
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re_offset = (k0 + (n << 2) + (k_line << 1)) % symbolSize;
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c16_t *rxF = &rxdataF[soffset + re_offset];
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printf("pilot %4d: pil -> (%6d,%6d), rxF -> (%4d,%4d), ch -> (%4d,%4d)\n",
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pilot_cnt, pil->r, pil->i, rxF->r, rxF->i, ch.r, ch.i);
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#endif
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if (pilot_cnt == 0) {
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c16multaddVectRealComplex(filt16_ul_p0, &ch16, ul_ch, 16);
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} else if (pilot_cnt == 1 || pilot_cnt == 2) {
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c16multaddVectRealComplex(filt16_ul_p1p2, &ch16, ul_ch, 16);
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} else if (pilot_cnt == (6 * nb_rb_pusch - 1)) {
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c16multaddVectRealComplex(filt16_ul_last, &ch16, ul_ch, 16);
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} else {
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c16multaddVectRealComplex(filt16_ul_middle, &ch16, ul_ch, 16);
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if (pilot_cnt % 2 == 0) {
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ul_ch += 4;
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}
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}
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pilot_cnt++;
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}
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}
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// Revert delay
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pilot_cnt = 0;
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ul_ch = &ul_ch_estimates[p * gNB->frame_parms.nb_antennas_rx + aarx][ch_offset];
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int inv_delay_idx = get_delay_idx(-delay->est_delay, MAX_DELAY_COMP);
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c16_t *ul_inv_delay_table = gNB->frame_parms.delay_table[inv_delay_idx];
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for (int n = 0; n < 3 * nb_rb_pusch; n++) {
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for (int k_line = 0; k_line <= 1; k_line++) {
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int k = pilot_cnt << 1;
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ul_ch[k] = c16mulShift(ul_ch[k], ul_inv_delay_table[k], 8);
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ul_ch[k + 1] = c16mulShift(ul_ch[k + 1], ul_inv_delay_table[k + 1], 8);
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noise_amp2 += c16amp2(c16sub(ul_ls_est[k], ul_ch[k]));
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noise_amp2 += c16amp2(c16sub(ul_ls_est[k + 1], ul_ch[k + 1]));
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#ifdef DEBUG_PUSCH
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re_offset = (k0 + (n << 2) + (k_line << 1)) % symbolSize;
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c16_t *rxF = &rxdataF[soffset + re_offset];
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printf("ch -> (%4d,%4d), ch_inter -> (%4d,%4d)\n", ul_ls_est[k].r, ul_ls_est[k].i, ul_ch[k].r, ul_ch[k].i);
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#endif
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pilot_cnt++;
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nest_count += 2;
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}
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}
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} else if (pusch_pdu->dmrs_config_type == pusch_dmrs_type2 && chest_freq == 0) { // pusch_dmrs_type2 |p_r,p_l,d,d,d,d,p_r,p_l,d,d,d,d|
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LOG_D(PHY, "PUSCH estimation DMRS type 2, Freq-domain interpolation\n");
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c16_t *pil = pilot;
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c16_t *rx = &rxdataF[soffset + nushift];
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for (int n = 0; n < nb_rb_pusch * NR_NB_SC_PER_RB; n += 6) {
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c16_t ch0 = c16mulShift(*pil, rx[(k0 + n) % symbolSize], 15);
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pil++;
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c16_t ch1 = c16mulShift(*pil, rx[(k0 + n + 1) % symbolSize], 15);
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pil++;
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c16_t ch = c16addShift(ch0, ch1, 1);
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*max_ch = max(*max_ch, max(abs(ch.r), abs(ch.i)));
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multadd_real_four_symbols_vector_complex_scalar(filt8_rep4, &ch, &ul_ls_est[n]);
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ul_ls_est[n + 4] = ch;
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ul_ls_est[n + 5] = ch;
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noise_amp2 += c16amp2(c16sub(ch0, ch));
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nest_count++;
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}
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// Delay compensation
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nr_est_delay(gNB->frame_parms.ofdm_symbol_size, ul_ls_est, (c16_t *)pusch_vars->ul_ch_estimates_time[aarx], delay);
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int delay_idx = get_delay_idx(-delay->est_delay, MAX_DELAY_COMP);
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c16_t *ul_delay_table = gNB->frame_parms.delay_table[delay_idx];
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for (int n = 0; n < nb_rb_pusch * NR_NB_SC_PER_RB; n++) {
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ul_ch[n] = c16mulShift(ul_ls_est[n], ul_delay_table[n % 6], 8);
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}
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}
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else if (pusch_pdu->dmrs_config_type == pusch_dmrs_type1) { // this is case without frequency-domain linear interpolation, just take average of LS channel estimates of 6 DMRS REs and use a common value for the whole PRB
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LOG_D(PHY,"PUSCH estimation DMRS type 1, no Freq-domain interpolation\n");
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c16_t *rxF = &rxdataF[soffset + nushift];
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int pil_offset = 0;
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int re_offset = k0;
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c16_t ch;
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// First PRB
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ch=c32x16cumulVectVectWithSteps(pilot, &pil_offset, 1, rxF, &re_offset, 2, symbolSize, 6);
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#if NO_INTERP
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for (c16_t *end=ul_ch+12; ul_ch<end; ul_ch++)
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*ul_ch=ch;
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#else
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c16multaddVectRealComplex(filt8_avlip0, &ch, ul_ch, 8);
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ul_ch += 8;
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c16multaddVectRealComplex(filt8_avlip1, &ch, ul_ch, 8);
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ul_ch += 8;
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c16multaddVectRealComplex(filt8_avlip2, &ch, ul_ch, 8);
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ul_ch -= 12;
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#endif
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for (int pilot_cnt=6; pilot_cnt<6*(nb_rb_pusch-1); pilot_cnt += 6) {
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ch=c32x16cumulVectVectWithSteps(pilot, &pil_offset, 1, rxF, &re_offset, 2, symbolSize, 6);
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*max_ch = max(*max_ch, max(abs(ch.r), abs(ch.i)));
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#if NO_INTERP
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for (c16_t *end=ul_ch+12; ul_ch<end; ul_ch++)
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*ul_ch=ch;
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#else
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ul_ch[3].r += (ch.r * 1365)>>15; // 1/12*16384
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ul_ch[3].i += (ch.i * 1365)>>15; // 1/12*16384
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ul_ch += 4;
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c16multaddVectRealComplex(filt8_avlip3, &ch, ul_ch, 8);
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ul_ch += 8;
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c16multaddVectRealComplex(filt8_avlip4, &ch, ul_ch, 8);
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ul_ch += 8;
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c16multaddVectRealComplex(filt8_avlip5, &ch, ul_ch, 8);
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ul_ch -= 8;
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#endif
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}
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// Last PRB
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ch=c32x16cumulVectVectWithSteps(pilot, &pil_offset, 1, rxF, &re_offset, 2, symbolSize, 6);
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#if NO_INTERP
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for (c16_t *end=ul_ch+12; ul_ch<end; ul_ch++)
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*ul_ch=ch;
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#else
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ul_ch[3].r += (ch.r * 1365)>>15; // 1/12*16384
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ul_ch[3].i += (ch.i * 1365)>>15; // 1/12*16384
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ul_ch += 4;
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c16multaddVectRealComplex(filt8_avlip3, &ch, ul_ch, 8);
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ul_ch += 8;
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c16multaddVectRealComplex(filt8_avlip6, &ch, ul_ch, 8);
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#endif
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} else { // this is case without frequency-domain linear interpolation, just take average of LS channel estimates of 4 DMRS REs and use a common value for the whole PRB
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LOG_D(PHY,"PUSCH estimation DMRS type 2, no Freq-domain interpolation");
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c16_t *pil = pilot;
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int re_offset = k0;
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c32_t ch0={0};
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//First PRB
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ch0=c32x16mulShift(*pil,
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rxdataF[soffset + nushift + re_offset],
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15);
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pil++;
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re_offset = (re_offset+1) % symbolSize;
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ch0=c32x16maddShift(*pil,
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rxdataF[nushift+re_offset],
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ch0,
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15);
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pil++;
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re_offset = (re_offset+5) % symbolSize;
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ch0=c32x16maddShift(*pil,
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rxdataF[nushift+re_offset],
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ch0,
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15);
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re_offset = (re_offset+1) % symbolSize;
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ch0=c32x16maddShift(*pil,
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rxdataF[nushift+re_offset],
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ch0,
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15);
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pil++;
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re_offset = (re_offset+5) % symbolSize;
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c16_t ch=c16x32div(ch0, 4);
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#if NO_INTERP
|
|
for (c16_t *end=ul_ch+12; ul_ch<end; ul_ch++)
|
|
*ul_ch=ch;
|
|
#else
|
|
c16multaddVectRealComplex(filt8_avlip0, &ch, ul_ch, 8);
|
|
ul_ch += 8;
|
|
c16multaddVectRealComplex(filt8_avlip1, &ch, ul_ch, 8);
|
|
ul_ch += 8;
|
|
c16multaddVectRealComplex(filt8_avlip2, &ch, ul_ch, 8);
|
|
ul_ch -= 12;
|
|
#endif
|
|
|
|
for (int pilot_cnt=4; pilot_cnt<4*(nb_rb_pusch-1); pilot_cnt += 4) {
|
|
c32_t ch0;
|
|
ch0=c32x16mulShift(*pil, rxdataF[nushift+re_offset], 15);
|
|
pil++;
|
|
re_offset = (re_offset+1) % symbolSize;
|
|
|
|
ch0=c32x16maddShift(*pil, rxdataF[nushift+re_offset], ch0, 15);
|
|
pil++;
|
|
re_offset = (re_offset+5) % symbolSize;
|
|
|
|
ch0=c32x16maddShift(*pil, rxdataF[nushift+re_offset], ch0, 15);
|
|
pil++;
|
|
re_offset = (re_offset+1) % symbolSize;
|
|
|
|
ch0=c32x16maddShift(*pil, rxdataF[nushift+re_offset], ch0, 15);
|
|
pil++;
|
|
re_offset = (re_offset+5) % symbolSize;
|
|
|
|
ch=c16x32div(ch0, 4);
|
|
*max_ch = max(*max_ch, max(abs(ch.r), abs(ch.i)));
|
|
|
|
#if NO_INTERP
|
|
for (c16_t *end=ul_ch+12; ul_ch<end; ul_ch++)
|
|
*ul_ch=ch;
|
|
#else
|
|
ul_ch[3] = c16maddShift(ch, (c16_t){1365, 1365}, (c16_t){0, 0}, 15); // 1365 = 1/12*16384 (full range is +/- 32768)
|
|
ul_ch += 4;
|
|
c16multaddVectRealComplex(filt8_avlip3, &ch, ul_ch, 8);
|
|
ul_ch += 8;
|
|
c16multaddVectRealComplex(filt8_avlip4, &ch, ul_ch, 8);
|
|
ul_ch += 8;
|
|
c16multaddVectRealComplex(filt8_avlip5, &ch, ul_ch, 8);
|
|
ul_ch -= 8;
|
|
#endif
|
|
}
|
|
|
|
// Last PRB
|
|
ch0=c32x16mulShift(*pil, rxdataF[nushift+re_offset], 15);
|
|
pil++;
|
|
re_offset = (re_offset+1) % symbolSize;
|
|
|
|
ch0=c32x16maddShift(*pil, rxdataF[nushift+re_offset], ch0, 15);
|
|
pil++;
|
|
re_offset = (re_offset+5) % symbolSize;
|
|
|
|
ch0=c32x16maddShift(*pil, rxdataF[nushift+re_offset], ch0, 15);
|
|
pil++;
|
|
re_offset = (re_offset+1) % symbolSize;
|
|
|
|
ch0=c32x16maddShift(*pil, rxdataF[nushift+re_offset], ch0, 15);
|
|
pil++;
|
|
re_offset = (re_offset+5) % symbolSize;
|
|
|
|
ch=c16x32div(ch0, 4);
|
|
#if NO_INTERP
|
|
for (c16_t *end=ul_ch+12; ul_ch<end; ul_ch++)
|
|
*ul_ch=ch;
|
|
#else
|
|
ul_ch[3] = c16maddShift(ch, (c16_t){1365, 1365}, (c16_t){0, 0}, 15); // 1365 = 1/12*16384 (full range is +/- 32768)
|
|
ul_ch += 4;
|
|
c16multaddVectRealComplex(filt8_avlip3, &ch, ul_ch, 8);
|
|
ul_ch += 8;
|
|
c16multaddVectRealComplex(filt8_avlip6, &ch, ul_ch, 8);
|
|
#endif
|
|
}
|
|
|
|
#ifdef DEBUG_PUSCH
|
|
ul_ch = &ul_ch_estimates[p * gNB->frame_parms.nb_antennas_rx + aarx][ch_offset];
|
|
for (int idxP = 0; idxP < ceil((float)nb_rb_pusch * 12 / 8); idxP++) {
|
|
for (int idxI = 0; idxI < 8; idxI++) {
|
|
printf("%d\t%d\t", ul_ch[idxP * 8 + idxI].r, ul_ch[idxP * 8 + idxI].i);
|
|
}
|
|
printf("%d\n", idxP);
|
|
}
|
|
#endif
|
|
|
|
}
|
|
|
|
#ifdef DEBUG_CH
|
|
fclose(debug_ch_est);
|
|
#endif
|
|
|
|
if (nvar && nest_count > 0) {
|
|
*nvar = (uint32_t)(noise_amp2 / nest_count);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*******************************************************************
|
|
*
|
|
* NAME : nr_pusch_ptrs_processing
|
|
*
|
|
* PARAMETERS : gNB : gNB data structure
|
|
* rel15_ul : UL parameters
|
|
* UE_id : UE ID
|
|
* nr_tti_rx : slot rx TTI
|
|
* dmrs_symbol_flag: DMRS Symbol Flag
|
|
* symbol : OFDM Symbol
|
|
* nb_re_pusch : PUSCH RE's
|
|
* nb_re_pusch : PUSCH RE's
|
|
*
|
|
* RETURN : nothing
|
|
*
|
|
* DESCRIPTION :
|
|
* If ptrs is enabled process the symbol accordingly
|
|
* 1) Estimate phase noise per PTRS symbol
|
|
* 2) Interpolate PTRS estimated value in TD after all PTRS symbols
|
|
* 3) Compensated DMRS based estimated signal with PTRS estimation for slot
|
|
*********************************************************************/
|
|
void nr_pusch_ptrs_processing(PHY_VARS_gNB *gNB,
|
|
NR_DL_FRAME_PARMS *frame_parms,
|
|
nfapi_nr_pusch_pdu_t *rel15_ul,
|
|
uint8_t ulsch_id,
|
|
uint8_t nr_tti_rx,
|
|
unsigned char symbol,
|
|
uint32_t nb_re_pusch)
|
|
{
|
|
NR_gNB_PUSCH *pusch_vars = &gNB->pusch_vars[ulsch_id];
|
|
//#define DEBUG_UL_PTRS 1
|
|
int32_t *ptrs_re_symbol = NULL;
|
|
int8_t ret = 0;
|
|
uint8_t symbInSlot = rel15_ul->start_symbol_index + rel15_ul->nr_of_symbols;
|
|
uint8_t *startSymbIndex = &rel15_ul->start_symbol_index;
|
|
uint8_t *nbSymb = &rel15_ul->nr_of_symbols;
|
|
uint8_t *L_ptrs = &rel15_ul->pusch_ptrs.ptrs_time_density;
|
|
uint8_t *K_ptrs = &rel15_ul->pusch_ptrs.ptrs_freq_density;
|
|
uint16_t *dmrsSymbPos = &rel15_ul->ul_dmrs_symb_pos;
|
|
uint16_t *ptrsSymbPos = &pusch_vars->ptrs_symbols;
|
|
uint8_t *ptrsSymbIdx = &pusch_vars->ptrs_symbol_index;
|
|
uint8_t *dmrsConfigType = &rel15_ul->dmrs_config_type;
|
|
uint16_t *nb_rb = &rel15_ul->rb_size;
|
|
uint8_t *ptrsReOffset = &rel15_ul->pusch_ptrs.ptrs_ports_list[0].ptrs_re_offset;
|
|
|
|
/* loop over antennas */
|
|
for (int aarx=0; aarx<frame_parms->nb_antennas_rx; aarx++) {
|
|
c16_t *phase_per_symbol = (c16_t *)pusch_vars->ptrs_phase_per_slot[aarx];
|
|
ptrs_re_symbol = &pusch_vars->ptrs_re_per_slot;
|
|
*ptrs_re_symbol = 0;
|
|
phase_per_symbol[symbol].i = 0;
|
|
/* set DMRS estimates to 0 angle with magnitude 1 */
|
|
if(is_dmrs_symbol(symbol,*dmrsSymbPos)) {
|
|
/* set DMRS real estimation to 32767 */
|
|
phase_per_symbol[symbol].r=INT16_MAX; // 32767
|
|
#ifdef DEBUG_UL_PTRS
|
|
printf("[PHY][PTRS]: DMRS Symbol %d -> %4d + j*%4d\n", symbol, phase_per_symbol[symbol].r,phase_per_symbol[symbol].i);
|
|
#endif
|
|
}
|
|
else {// real ptrs value is set to 0
|
|
phase_per_symbol[symbol].r = 0;
|
|
}
|
|
|
|
if(symbol == *startSymbIndex) {
|
|
*ptrsSymbPos = 0;
|
|
set_ptrs_symb_idx(ptrsSymbPos,
|
|
*nbSymb,
|
|
*startSymbIndex,
|
|
1<< *L_ptrs,
|
|
*dmrsSymbPos);
|
|
}
|
|
|
|
/* if not PTRS symbol set current ptrs symbol index to zero*/
|
|
*ptrsSymbIdx = 0;
|
|
|
|
/* Check if current symbol contains PTRS */
|
|
if(is_ptrs_symbol(symbol, *ptrsSymbPos)) {
|
|
*ptrsSymbIdx = symbol;
|
|
/*------------------------------------------------------------------------------------------------------- */
|
|
/* 1) Estimate common phase error per PTRS symbol */
|
|
/*------------------------------------------------------------------------------------------------------- */
|
|
nr_ptrs_cpe_estimation(*K_ptrs,
|
|
*ptrsReOffset,
|
|
*dmrsConfigType,
|
|
*nb_rb,
|
|
rel15_ul->rnti,
|
|
nr_tti_rx,
|
|
symbol,
|
|
frame_parms->ofdm_symbol_size,
|
|
(int16_t *)&pusch_vars->rxdataF_comp[aarx][(symbol * nb_re_pusch)],
|
|
gNB->nr_gold_pusch_dmrs[rel15_ul->scid][nr_tti_rx][symbol],
|
|
(int16_t *)&phase_per_symbol[symbol],
|
|
ptrs_re_symbol);
|
|
}
|
|
|
|
/* For last OFDM symbol at each antenna perform interpolation and compensation for the slot*/
|
|
if(symbol == (symbInSlot -1)) {
|
|
/*------------------------------------------------------------------------------------------------------- */
|
|
/* 2) Interpolate PTRS estimated value in TD */
|
|
/*------------------------------------------------------------------------------------------------------- */
|
|
/* If L-PTRS is > 0 then we need interpolation */
|
|
if(*L_ptrs > 0) {
|
|
ret = nr_ptrs_process_slot(*dmrsSymbPos, *ptrsSymbPos, (int16_t*)phase_per_symbol, *startSymbIndex, *nbSymb);
|
|
if(ret != 0) {
|
|
LOG_W(PHY,"[PTRS] Compensation is skipped due to error in PTRS slot processing !!\n");
|
|
}
|
|
}
|
|
|
|
#ifdef DEBUG_UL_PTRS
|
|
LOG_M("ptrsEstUl.m", "est", pusch_vars->ptrs_phase_per_slot[aarx], frame_parms->symbols_per_slot, 1, 1);
|
|
LOG_M("rxdataF_bf_ptrs_comp_ul.m","bf_ptrs_cmp",
|
|
&gNB->pusch_vars[0]->rxdataF_comp[aarx][rel15_ul->start_symbol_index * NR_NB_SC_PER_RB * rel15_ul->rb_size],
|
|
rel15_ul->nr_of_symbols * NR_NB_SC_PER_RB * rel15_ul->rb_size,1,1);
|
|
#endif
|
|
|
|
/*------------------------------------------------------------------------------------------------------- */
|
|
/* 3) Compensated DMRS based estimated signal with PTRS estimation */
|
|
/*--------------------------------------------------------------------------------------------------------*/
|
|
for(uint8_t i = *startSymbIndex; i < symbInSlot; i++) {
|
|
/* DMRS Symbol has 0 phase so no need to rotate the respective symbol */
|
|
/* Skip rotation if the slot processing is wrong */
|
|
if((!is_dmrs_symbol(i,*dmrsSymbPos)) && (ret == 0)) {
|
|
#ifdef DEBUG_UL_PTRS
|
|
printf("[PHY][UL][PTRS]: Rotate Symbol %2d with %d + j* %d\n", i, phase_per_symbol[i].r,phase_per_symbol[i].i);
|
|
#endif
|
|
rotate_cpx_vector((c16_t *)&pusch_vars->rxdataF_comp[aarx][(i * rel15_ul->rb_size * NR_NB_SC_PER_RB)],
|
|
&phase_per_symbol[i],
|
|
(c16_t *)&pusch_vars->rxdataF_comp[aarx][(i * rel15_ul->rb_size * NR_NB_SC_PER_RB)],
|
|
((*nb_rb) * NR_NB_SC_PER_RB),
|
|
15);
|
|
}// if not DMRS Symbol
|
|
}// symbol loop
|
|
}// last symbol check
|
|
}//Antenna loop
|
|
}
|
|
|
|
uint32_t calc_power(const int16_t *x, const uint32_t size) {
|
|
int64_t sum_x = 0;
|
|
int64_t sum_x2 = 0;
|
|
for(int k = 0; k<size; k++) {
|
|
sum_x = sum_x + x[k];
|
|
sum_x2 = sum_x2 + x[k]*x[k];
|
|
}
|
|
|
|
return sum_x2/size - (sum_x/size)*(sum_x/size);
|
|
}
|
|
|
|
int nr_srs_channel_estimation(const PHY_VARS_gNB *gNB,
|
|
const int frame,
|
|
const int slot,
|
|
const nfapi_nr_srs_pdu_t *srs_pdu,
|
|
const nr_srs_info_t *nr_srs_info,
|
|
const int32_t **srs_generated_signal,
|
|
int32_t srs_received_signal[][gNB->frame_parms.ofdm_symbol_size*(1<<srs_pdu->num_symbols)],
|
|
int32_t srs_estimated_channel_freq[][1<<srs_pdu->num_ant_ports][gNB->frame_parms.ofdm_symbol_size*(1<<srs_pdu->num_symbols)],
|
|
int32_t srs_estimated_channel_time[][1<<srs_pdu->num_ant_ports][gNB->frame_parms.ofdm_symbol_size],
|
|
int32_t srs_estimated_channel_time_shifted[][1<<srs_pdu->num_ant_ports][gNB->frame_parms.ofdm_symbol_size],
|
|
int8_t *snr_per_rb,
|
|
int8_t *snr) {
|
|
|
|
#ifdef SRS_DEBUG
|
|
LOG_I(NR_PHY,"Calling %s function\n", __FUNCTION__);
|
|
#endif
|
|
|
|
const NR_DL_FRAME_PARMS *frame_parms = &gNB->frame_parms;
|
|
const uint64_t subcarrier_offset = frame_parms->first_carrier_offset + srs_pdu->bwp_start*NR_NB_SC_PER_RB;
|
|
|
|
const uint8_t N_ap = 1<<srs_pdu->num_ant_ports;
|
|
const uint8_t K_TC = 2<<srs_pdu->comb_size;
|
|
const uint16_t m_SRS_b = srs_bandwidth_config[srs_pdu->config_index][srs_pdu->bandwidth_index][0];
|
|
const uint16_t M_sc_b_SRS = m_SRS_b * NR_NB_SC_PER_RB/K_TC;
|
|
uint8_t fd_cdm = N_ap;
|
|
if (N_ap == 4 && ((K_TC == 2 && srs_pdu->cyclic_shift >= 4) || (K_TC == 4 && srs_pdu->cyclic_shift >= 6))) {
|
|
fd_cdm = 2;
|
|
}
|
|
|
|
c16_t srs_ls_estimated_channel[frame_parms->ofdm_symbol_size*(1<<srs_pdu->num_symbols)];
|
|
uint32_t noise_power_per_rb[srs_pdu->bwp_size];
|
|
int16_t ch_real[frame_parms->nb_antennas_rx*N_ap*M_sc_b_SRS];
|
|
int16_t ch_imag[frame_parms->nb_antennas_rx*N_ap*M_sc_b_SRS];
|
|
int16_t noise_real[frame_parms->nb_antennas_rx*N_ap*M_sc_b_SRS];
|
|
int16_t noise_imag[frame_parms->nb_antennas_rx*N_ap*M_sc_b_SRS];
|
|
int16_t ls_estimated[2];
|
|
|
|
uint8_t mem_offset = ((16 - ((long)&srs_estimated_channel_freq[0][0][subcarrier_offset + nr_srs_info->k_0_p[0][0]])) & 0xF) >> 2; // >> 2 <=> /sizeof(int32_t)
|
|
|
|
// filt16_end is {4096,8192,8192,8192,12288,16384,16384,16384,0,0,0,0,0,0,0,0}
|
|
// The End of OFDM symbol corresponds to the position of last 16384 in the filter
|
|
// The multadd_real_vector_complex_scalar applies the remaining 8 zeros of filter, therefore, to avoid a buffer overflow,
|
|
// we added 8 in the array size
|
|
int32_t srs_est[frame_parms->ofdm_symbol_size*(1<<srs_pdu->num_symbols) + mem_offset + 8] __attribute__ ((aligned(32)));
|
|
|
|
for (int ant = 0; ant < frame_parms->nb_antennas_rx; ant++) {
|
|
|
|
for (int p_index = 0; p_index < N_ap; p_index++) {
|
|
|
|
memset(srs_ls_estimated_channel, 0, frame_parms->ofdm_symbol_size*(1<<srs_pdu->num_symbols)*sizeof(c16_t));
|
|
memset(srs_est, 0, (frame_parms->ofdm_symbol_size*(1<<srs_pdu->num_symbols) + mem_offset)*sizeof(int32_t));
|
|
|
|
#ifdef SRS_DEBUG
|
|
LOG_I(NR_PHY,"====================== UE port %d --> gNB Rx antenna %i ======================\n", p_index, ant);
|
|
#endif
|
|
|
|
uint16_t subcarrier = subcarrier_offset + nr_srs_info->k_0_p[p_index][0];
|
|
if (subcarrier>frame_parms->ofdm_symbol_size) {
|
|
subcarrier -= frame_parms->ofdm_symbol_size;
|
|
}
|
|
|
|
int16_t *srs_estimated_channel16 = (int16_t *)&srs_est[subcarrier + mem_offset];
|
|
|
|
for (int k = 0; k < M_sc_b_SRS; k++) {
|
|
|
|
if (k%fd_cdm==0) {
|
|
|
|
ls_estimated[0] = 0;
|
|
ls_estimated[1] = 0;
|
|
uint16_t subcarrier_cdm = subcarrier;
|
|
|
|
for (int cdm_idx = 0; cdm_idx < fd_cdm; cdm_idx++) {
|
|
|
|
int16_t generated_real = ((c16_t*)srs_generated_signal[p_index])[subcarrier_cdm].r;
|
|
int16_t generated_imag = ((c16_t*)srs_generated_signal[p_index])[subcarrier_cdm].i;
|
|
|
|
int16_t received_real = ((c16_t*)srs_received_signal[ant])[subcarrier_cdm].r;
|
|
int16_t received_imag = ((c16_t*)srs_received_signal[ant])[subcarrier_cdm].i;
|
|
|
|
// We know that nr_srs_info->srs_generated_signal_bits bits are enough to represent the generated_real and generated_imag.
|
|
// So we only need a nr_srs_info->srs_generated_signal_bits shift to ensure that the result fits into 16 bits.
|
|
ls_estimated[0] += (int16_t)(((int32_t)generated_real*received_real + (int32_t)generated_imag*received_imag)>>nr_srs_info->srs_generated_signal_bits);
|
|
ls_estimated[1] += (int16_t)(((int32_t)generated_real*received_imag - (int32_t)generated_imag*received_real)>>nr_srs_info->srs_generated_signal_bits);
|
|
|
|
// Subcarrier increment
|
|
subcarrier_cdm += K_TC;
|
|
if (subcarrier_cdm >= frame_parms->ofdm_symbol_size) {
|
|
subcarrier_cdm=subcarrier_cdm-frame_parms->ofdm_symbol_size;
|
|
}
|
|
}
|
|
}
|
|
|
|
srs_ls_estimated_channel[subcarrier].r = ls_estimated[0];
|
|
srs_ls_estimated_channel[subcarrier].i = ls_estimated[1];
|
|
|
|
#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,"\t __genRe________genIm__|____rxRe_________rxIm__|____lsRe________lsIm_\n");
|
|
}
|
|
LOG_I(NR_PHY,"(%4i) %6i\t%6i | %6i\t%6i | %6i\t%6i\n",
|
|
subcarrier_log,
|
|
((c16_t*)srs_generated_signal[p_index])[subcarrier].r, ((c16_t*)srs_generated_signal[p_index])[subcarrier].i,
|
|
((c16_t*)srs_received_signal[ant])[subcarrier].r, ((c16_t*)srs_received_signal[ant])[subcarrier].i,
|
|
ls_estimated[0], ls_estimated[1]);
|
|
#endif
|
|
|
|
const uint16_t sc_offset = subcarrier + mem_offset;
|
|
|
|
// Channel interpolation
|
|
if(srs_pdu->comb_size == 0) {
|
|
if(k == 0) { // First subcarrier case
|
|
// filt8_start is {12288,8192,4096,0,0,0,0,0}
|
|
multadd_real_vector_complex_scalar(filt8_start, ls_estimated, srs_estimated_channel16, 8);
|
|
} else if(subcarrier < K_TC) { // Start of OFDM symbol case
|
|
// filt8_start is {12288,8192,4096,0,0,0,0,0}
|
|
srs_estimated_channel16 = (int16_t *)&srs_est[subcarrier];
|
|
const short *filter = mem_offset == 0 ? filt8_start : filt8_start_shift2;
|
|
multadd_real_vector_complex_scalar(filter, ls_estimated, srs_estimated_channel16, 8);
|
|
} else if((subcarrier+K_TC)>=frame_parms->ofdm_symbol_size || k == (M_sc_b_SRS-1)) { // End of OFDM symbol or last subcarrier cases
|
|
// filt8_end is {4096,8192,12288,16384,0,0,0,0}
|
|
const short *filter = mem_offset == 0 || k == (M_sc_b_SRS - 1) ? filt8_end : filt8_end_shift2;
|
|
multadd_real_vector_complex_scalar(filter, ls_estimated, srs_estimated_channel16, 8);
|
|
} else if(k%2 == 1) { // 1st middle case
|
|
// filt8_middle2 is {4096,8192,8192,8192,4096,0,0,0}
|
|
multadd_real_vector_complex_scalar(filt8_middle2, ls_estimated, srs_estimated_channel16, 8);
|
|
} else if(k%2 == 0) { // 2nd middle case
|
|
// filt8_middle4 is {0,0,4096,8192,8192,8192,4096,0}
|
|
multadd_real_vector_complex_scalar(filt8_middle4, ls_estimated, srs_estimated_channel16, 8);
|
|
srs_estimated_channel16 = (int16_t *)&srs_est[sc_offset];
|
|
}
|
|
} else {
|
|
if(k == 0) { // First subcarrier case
|
|
// filt16_start is {12288,8192,8192,8192,4096,0,0,0,0,0,0,0,0,0,0,0}
|
|
multadd_real_vector_complex_scalar(filt16_start, ls_estimated, srs_estimated_channel16, 16);
|
|
} else if(subcarrier < K_TC) { // Start of OFDM symbol case
|
|
srs_estimated_channel16 = (int16_t *)&srs_est[sc_offset];
|
|
// filt16_start is {12288,8192,8192,8192,4096,0,0,0,0,0,0,0,0,0,0,0}
|
|
multadd_real_vector_complex_scalar(filt16_start, ls_estimated, srs_estimated_channel16, 16);
|
|
} else if((subcarrier+K_TC)>=frame_parms->ofdm_symbol_size || k == (M_sc_b_SRS-1)) { // End of OFDM symbol or last subcarrier cases
|
|
// filt16_end is {4096,8192,8192,8192,12288,16384,16384,16384,0,0,0,0,0,0,0,0}
|
|
multadd_real_vector_complex_scalar(filt16_end, ls_estimated, srs_estimated_channel16, 16);
|
|
} else { // Middle case
|
|
// filt16_middle4 is {4096,8192,8192,8192,8192,8192,8192,8192,4096,0,0,0,0,0,0,0}
|
|
multadd_real_vector_complex_scalar(filt16_middle4, ls_estimated, srs_estimated_channel16, 16);
|
|
srs_estimated_channel16 = (int16_t *)&srs_est[sc_offset];
|
|
}
|
|
}
|
|
|
|
// 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++)
|
|
|
|
memcpy(&srs_estimated_channel_freq[ant][p_index][0],
|
|
&srs_est[mem_offset],
|
|
(frame_parms->ofdm_symbol_size*(1<<srs_pdu->num_symbols))*sizeof(int32_t));
|
|
|
|
// Compute noise
|
|
subcarrier = subcarrier_offset + nr_srs_info->k_0_p[p_index][0];
|
|
if (subcarrier>frame_parms->ofdm_symbol_size) {
|
|
subcarrier -= frame_parms->ofdm_symbol_size;
|
|
}
|
|
uint16_t base_idx = ant*N_ap*M_sc_b_SRS + p_index*M_sc_b_SRS;
|
|
for (int k = 0; k < M_sc_b_SRS; k++) {
|
|
ch_real[base_idx+k] = ((c16_t*)srs_estimated_channel_freq[ant][p_index])[subcarrier].r;
|
|
ch_imag[base_idx+k] = ((c16_t*)srs_estimated_channel_freq[ant][p_index])[subcarrier].i;
|
|
noise_real[base_idx+k] = abs(srs_ls_estimated_channel[subcarrier].r - ch_real[base_idx+k]);
|
|
noise_imag[base_idx+k] = abs(srs_ls_estimated_channel[subcarrier].i - ch_imag[base_idx+k]);
|
|
subcarrier += K_TC;
|
|
if (subcarrier >= frame_parms->ofdm_symbol_size) {
|
|
subcarrier=subcarrier-frame_parms->ofdm_symbol_size;
|
|
}
|
|
}
|
|
|
|
#ifdef SRS_DEBUG
|
|
subcarrier = subcarrier_offset + nr_srs_info->k_0_p[p_index][0];
|
|
if (subcarrier>frame_parms->ofdm_symbol_size) {
|
|
subcarrier -= frame_parms->ofdm_symbol_size;
|
|
}
|
|
|
|
for (int k = 0; k < K_TC*M_sc_b_SRS; k++) {
|
|
|
|
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,"\t __lsRe__________lsIm__|____intRe_______intIm__|____noiRe_______noiIm__\n");
|
|
}
|
|
|
|
LOG_I(NR_PHY,"(%4i) %6i\t%6i | %6i\t%6i | %6i\t%6i\n",
|
|
subcarrier_log,
|
|
srs_ls_estimated_channel[subcarrier].r,
|
|
srs_ls_estimated_channel[subcarrier].i,
|
|
((c16_t*)srs_estimated_channel_freq[ant][p_index])[subcarrier].r,
|
|
((c16_t*)srs_estimated_channel_freq[ant][p_index])[subcarrier].i,
|
|
noise_real[base_idx+(k/K_TC)], noise_imag[base_idx+(k/K_TC)]);
|
|
|
|
// Subcarrier increment
|
|
subcarrier++;
|
|
if (subcarrier >= frame_parms->ofdm_symbol_size) {
|
|
subcarrier=subcarrier-frame_parms->ofdm_symbol_size;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
// Convert to time domain
|
|
freq2time(gNB->frame_parms.ofdm_symbol_size,
|
|
(int16_t*) srs_estimated_channel_freq[ant][p_index],
|
|
(int16_t*) srs_estimated_channel_time[ant][p_index]);
|
|
|
|
memcpy(&srs_estimated_channel_time_shifted[ant][p_index][0],
|
|
&srs_estimated_channel_time[ant][p_index][gNB->frame_parms.ofdm_symbol_size>>1],
|
|
(gNB->frame_parms.ofdm_symbol_size>>1)*sizeof(int32_t));
|
|
|
|
memcpy(&srs_estimated_channel_time_shifted[ant][p_index][gNB->frame_parms.ofdm_symbol_size>>1],
|
|
&srs_estimated_channel_time[ant][p_index][0],
|
|
(gNB->frame_parms.ofdm_symbol_size>>1)*sizeof(int32_t));
|
|
|
|
} // for (int p_index = 0; p_index < N_ap; p_index++)
|
|
} // for (int ant = 0; ant < frame_parms->nb_antennas_rx; ant++)
|
|
|
|
// Compute signal power
|
|
uint32_t signal_power = calc_power(ch_real,frame_parms->nb_antennas_rx*N_ap*M_sc_b_SRS)
|
|
+ calc_power(ch_imag,frame_parms->nb_antennas_rx*N_ap*M_sc_b_SRS);
|
|
|
|
#ifdef SRS_DEBUG
|
|
LOG_I(NR_PHY,"signal_power = %u\n", signal_power);
|
|
#endif
|
|
|
|
if (signal_power == 0) {
|
|
LOG_W(NR_PHY, "Received SRS signal power is 0\n");
|
|
return -1;
|
|
}
|
|
|
|
// Compute noise power
|
|
|
|
const uint8_t signal_power_bits = log2_approx(signal_power);
|
|
const uint8_t factor_bits = signal_power_bits < 32 ? 32 - signal_power_bits : 0; // 32 due to input of dB_fixed(uint32_t x)
|
|
const int32_t factor_dB = dB_fixed(1<<factor_bits);
|
|
|
|
const uint8_t srs_symbols_per_rb = srs_pdu->comb_size == 0 ? 6 : 3;
|
|
const uint8_t n_noise_est = frame_parms->nb_antennas_rx*N_ap*srs_symbols_per_rb;
|
|
uint64_t sum_re = 0;
|
|
uint64_t sum_re2 = 0;
|
|
uint64_t sum_im = 0;
|
|
uint64_t sum_im2 = 0;
|
|
|
|
for (int rb = 0; rb < m_SRS_b; rb++) {
|
|
|
|
sum_re = 0;
|
|
sum_re2 = 0;
|
|
sum_im = 0;
|
|
sum_im2 = 0;
|
|
|
|
for (int ant = 0; ant < frame_parms->nb_antennas_rx; ant++) {
|
|
for (int p_index = 0; p_index < N_ap; p_index++) {
|
|
uint16_t base_idx = ant*N_ap*M_sc_b_SRS + p_index*M_sc_b_SRS + rb*srs_symbols_per_rb;
|
|
for (int srs_symb = 0; srs_symb < srs_symbols_per_rb; srs_symb++) {
|
|
sum_re = sum_re + noise_real[base_idx+srs_symb];
|
|
sum_re2 = sum_re2 + noise_real[base_idx+srs_symb]*noise_real[base_idx+srs_symb];
|
|
sum_im = sum_im + noise_imag[base_idx+srs_symb];
|
|
sum_im2 = sum_im2 + noise_imag[base_idx+srs_symb]*noise_imag[base_idx+srs_symb];
|
|
} // for (int srs_symb = 0; srs_symb < srs_symbols_per_rb; srs_symb++)
|
|
} // for (int p_index = 0; p_index < N_ap; p_index++)
|
|
} // for (int ant = 0; ant < frame_parms->nb_antennas_rx; ant++)
|
|
|
|
noise_power_per_rb[rb] = max(sum_re2 / n_noise_est - (sum_re / n_noise_est) * (sum_re / n_noise_est) +
|
|
sum_im2 / n_noise_est - (sum_im / n_noise_est) * (sum_im / n_noise_est), 1);
|
|
snr_per_rb[rb] = dB_fixed((int32_t)((signal_power<<factor_bits)/noise_power_per_rb[rb])) - factor_dB;
|
|
|
|
#ifdef SRS_DEBUG
|
|
LOG_I(NR_PHY,"noise_power_per_rb[%i] = %i, snr_per_rb[%i] = %i dB\n", rb, noise_power_per_rb[rb], rb, snr_per_rb[rb]);
|
|
#endif
|
|
|
|
} // for (int rb = 0; rb < m_SRS_b; rb++)
|
|
|
|
uint32_t noise_power = max(calc_power(noise_real,frame_parms->nb_antennas_rx*N_ap*M_sc_b_SRS)
|
|
+ calc_power(noise_imag,frame_parms->nb_antennas_rx*N_ap*M_sc_b_SRS), 1);
|
|
|
|
*snr = dB_fixed((int32_t)((signal_power<<factor_bits)/(noise_power))) - factor_dB;
|
|
|
|
#ifdef SRS_DEBUG
|
|
LOG_I(NR_PHY,"noise_power = %u, SNR = %i dB\n", noise_power, *snr);
|
|
#endif
|
|
|
|
return 0;
|
|
}
|