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533 lines
16 KiB
C
533 lines
16 KiB
C
/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2015 Software Radio Systems Limited
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*
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* \section LICENSE
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*
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* This file is part of the srsLTE library.
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*
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* srsLTE is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of
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* the License, or (at your option) any later version.
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*
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* srsLTE is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* A copy of the GNU Affero General Public License can be found in
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* the LICENSE file in the top-level directory of this distribution
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* and at http://www.gnu.org/licenses/.
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*
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*/
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#include <stdlib.h>
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#include <strings.h>
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#include <complex.h>
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#include <math.h>
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#include "srslte/utils/debug.h"
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#include "srslte/common/phy_common.h"
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#include "srslte/sync/sync.h"
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#include "srslte/utils/vector.h"
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#include "srslte/sync/cfo.h"
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#define MEANPEAK_EMA_ALPHA 0.1
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#define CFO_EMA_ALPHA 0.1
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#define CP_EMA_ALPHA 0.1
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static bool fft_size_isvalid(uint32_t fft_size) {
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if (fft_size >= SRSLTE_SYNC_FFT_SZ_MIN && fft_size <= SRSLTE_SYNC_FFT_SZ_MAX && (fft_size%64) == 0) {
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return true;
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} else {
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return false;
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}
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}
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int srslte_sync_init(srslte_sync_t *q, uint32_t frame_size, uint32_t max_offset, uint32_t fft_size)
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{
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return srslte_sync_init_decim(q, frame_size, max_offset, fft_size, 1);
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}
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int srslte_sync_init_decim(srslte_sync_t *q, uint32_t frame_size, uint32_t max_offset, uint32_t fft_size, int decimate) {
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int ret = SRSLTE_ERROR_INVALID_INPUTS;
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if (q != NULL &&
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frame_size <= 307200 &&
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fft_size_isvalid(fft_size))
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{
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ret = SRSLTE_ERROR;
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bzero(q, sizeof(srslte_sync_t));
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q->detect_cp = true;
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q->sss_en = true;
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q->mean_cfo = 0;
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q->mean_cfo2 = 0;
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q->N_id_2 = 1000;
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q->N_id_1 = 1000;
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q->cfo_i = 0;
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q->find_cfo_i = false;
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q->find_cfo_i_initiated = false;
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q->cfo_ema_alpha = CFO_EMA_ALPHA;
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q->fft_size = fft_size;
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q->frame_size = frame_size;
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q->max_offset = max_offset;
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q->sss_alg = SSS_FULL;
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q->enable_cfo_corr = true;
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if (srslte_cfo_init(&q->cfocorr, q->frame_size)) {
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fprintf(stderr, "Error initiating CFO\n");
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goto clean_exit;
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}
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if (srslte_cfo_init(&q->cfocorr2, q->frame_size)) {
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fprintf(stderr, "Error initiating CFO\n");
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goto clean_exit;
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}
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// Set a CFO tolerance of approx 50 Hz
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srslte_cfo_set_tol(&q->cfocorr, 50.0/(15000.0*q->fft_size));
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// Set a CFO tolerance of approx 50 Hz
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srslte_cfo_set_tol(&q->cfocorr2, 50.0/(15000.0*q->fft_size));
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for (int i=0;i<2;i++) {
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q->cfo_i_corr[i] = srslte_vec_malloc(sizeof(cf_t)*q->frame_size);
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if (!q->cfo_i_corr[i]) {
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perror("malloc");
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goto clean_exit;
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}
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}
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q->temp = srslte_vec_malloc(sizeof(cf_t)*2*q->frame_size);
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if (!q->temp) {
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perror("malloc");
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goto clean_exit;
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}
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srslte_sync_set_cp(q, SRSLTE_CP_NORM);
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q->decimate = decimate;
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if(!decimate)
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decimate = 1;
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if (srslte_pss_synch_init_fft_offset_decim(&q->pss, max_offset, fft_size,0,decimate)) {
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fprintf(stderr, "Error initializing PSS object\n");
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goto clean_exit;
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}
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if (srslte_sss_synch_init(&q->sss, fft_size)) {
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fprintf(stderr, "Error initializing SSS object\n");
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goto clean_exit;
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}
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if (srslte_cp_synch_init(&q->cp_synch, fft_size)) {
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fprintf(stderr, "Error initiating CFO\n");
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goto clean_exit;
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}
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DEBUG("SYNC init with frame_size=%d, max_offset=%d and fft_size=%d\n", frame_size, max_offset, fft_size);
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ret = SRSLTE_SUCCESS;
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} else {
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fprintf(stderr, "Invalid parameters frame_size: %d, fft_size: %d\n", frame_size, fft_size);
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}
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clean_exit:
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if (ret == SRSLTE_ERROR) {
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srslte_sync_free(q);
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}
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return ret;
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}
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void srslte_sync_free(srslte_sync_t *q) {
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if (q) {
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srslte_pss_synch_free(&q->pss);
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srslte_sss_synch_free(&q->sss);
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srslte_cfo_free(&q->cfocorr);
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srslte_cfo_free(&q->cfocorr2);
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srslte_cp_synch_free(&q->cp_synch);
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for (int i=0;i<2;i++) {
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if (q->cfo_i_corr[i]) {
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free(q->cfo_i_corr[i]);
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}
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srslte_pss_synch_free(&q->pss_i[i]);
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}
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if (q->temp) {
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free(q->temp);
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}
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}
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}
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void srslte_sync_set_threshold(srslte_sync_t *q, float threshold) {
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q->threshold = threshold;
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}
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void srslte_sync_cfo_i_detec_en(srslte_sync_t *q, bool enabled) {
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q->find_cfo_i = enabled;
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if (enabled && !q->find_cfo_i_initiated) {
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for (int i=0;i<2;i++) {
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int offset=(i==0)?-1:1;
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if (srslte_pss_synch_init_fft_offset(&q->pss_i[i], q->max_offset, q->fft_size, offset)) {
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fprintf(stderr, "Error initializing PSS object\n");
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}
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for (int t=0;t<q->frame_size;t++) {
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q->cfo_i_corr[i][t] = cexpf(-2*_Complex_I*M_PI*offset*(float) t/q->fft_size);
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}
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}
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q->find_cfo_i_initiated = true;
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}
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}
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void srslte_sync_sss_en(srslte_sync_t *q, bool enabled) {
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q->sss_en = enabled;
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}
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bool srslte_sync_sss_detected(srslte_sync_t *q) {
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return srslte_N_id_1_isvalid(q->N_id_1);
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}
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int srslte_sync_get_cell_id(srslte_sync_t *q) {
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if (srslte_N_id_2_isvalid(q->N_id_2) && srslte_N_id_1_isvalid(q->N_id_1)) {
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return q->N_id_1*3 + q->N_id_2;
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} else {
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return -1;
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}
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}
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int srslte_sync_set_N_id_2(srslte_sync_t *q, uint32_t N_id_2) {
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if (srslte_N_id_2_isvalid(N_id_2)) {
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q->N_id_2 = N_id_2;
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return SRSLTE_SUCCESS;
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} else {
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fprintf(stderr, "Invalid N_id_2=%d\n", N_id_2);
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return SRSLTE_ERROR_INVALID_INPUTS;
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}
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}
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uint32_t srslte_sync_get_sf_idx(srslte_sync_t *q) {
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return q->sf_idx;
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}
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float srslte_sync_get_cfo(srslte_sync_t *q) {
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return q->mean_cfo2 + q->cfo_i;
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}
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void srslte_sync_set_cfo(srslte_sync_t *q, float cfo) {
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q->mean_cfo = cfo;
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}
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void srslte_sync_set_cfo_i(srslte_sync_t *q, int cfo_i) {
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q->cfo_i = cfo_i;
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}
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void srslte_sync_set_cfo_enable(srslte_sync_t *q, bool enable) {
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q->enable_cfo_corr = enable;
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}
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void srslte_sync_set_cfo_ema_alpha(srslte_sync_t *q, float alpha) {
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q->cfo_ema_alpha = alpha;
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}
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float srslte_sync_get_last_peak_value(srslte_sync_t *q) {
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return q->peak_value;
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}
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float srslte_sync_get_peak_value(srslte_sync_t *q) {
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return q->peak_value;
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}
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void srslte_sync_cp_en(srslte_sync_t *q, bool enabled) {
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q->detect_cp = enabled;
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}
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bool srslte_sync_sss_is_en(srslte_sync_t *q) {
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return q->sss_en;
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}
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void srslte_sync_set_em_alpha(srslte_sync_t *q, float alpha) {
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srslte_pss_synch_set_ema_alpha(&q->pss, alpha);
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}
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srslte_cp_t srslte_sync_get_cp(srslte_sync_t *q) {
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return q->cp;
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}
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void srslte_sync_set_cp(srslte_sync_t *q, srslte_cp_t cp) {
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q->cp = cp;
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q->cp_len = SRSLTE_CP_ISNORM(q->cp)?SRSLTE_CP_LEN_NORM(1,q->fft_size):SRSLTE_CP_LEN_EXT(q->fft_size);
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if (q->frame_size < q->fft_size) {
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q->nof_symbols = 1;
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} else {
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q->nof_symbols = q->frame_size/(q->fft_size+q->cp_len)-1;
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}
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}
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void srslte_sync_set_sss_algorithm(srslte_sync_t *q, sss_alg_t alg) {
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q->sss_alg = alg;
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}
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/* CP detection algorithm taken from:
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* "SSS Detection Method for Initial Cell Search in 3GPP LTE FDD/TDD Dual Mode Receiver"
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* by Jung-In Kim et al.
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*/
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srslte_cp_t srslte_sync_detect_cp(srslte_sync_t *q, cf_t *input, uint32_t peak_pos)
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{
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float R_norm=0, R_ext=0, C_norm=0, C_ext=0;
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float M_norm=0, M_ext=0;
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uint32_t cp_norm_len = SRSLTE_CP_LEN_NORM(7, q->fft_size);
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uint32_t cp_ext_len = SRSLTE_CP_LEN_EXT(q->fft_size);
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uint32_t nof_symbols = peak_pos/(q->fft_size+cp_ext_len);
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if (nof_symbols > 3) {
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nof_symbols = 3;
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}
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if (nof_symbols > 0) {
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cf_t *input_cp_norm = &input[peak_pos-nof_symbols*(q->fft_size+cp_norm_len)];
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cf_t *input_cp_ext = &input[peak_pos-nof_symbols*(q->fft_size+cp_ext_len)];
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for (int i=0;i<nof_symbols;i++) {
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R_norm += crealf(srslte_vec_dot_prod_conj_ccc(&input_cp_norm[q->fft_size], input_cp_norm, cp_norm_len));
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C_norm += cp_norm_len * srslte_vec_avg_power_cf(input_cp_norm, cp_norm_len);
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input_cp_norm += q->fft_size+cp_norm_len;
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}
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if (C_norm > 0) {
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M_norm = R_norm/C_norm;
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}
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q->M_norm_avg = SRSLTE_VEC_EMA(M_norm/nof_symbols, q->M_norm_avg, CP_EMA_ALPHA);
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for (int i=0;i<nof_symbols;i++) {
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R_ext += crealf(srslte_vec_dot_prod_conj_ccc(&input_cp_ext[q->fft_size], input_cp_ext, cp_ext_len));
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C_ext += cp_ext_len * srslte_vec_avg_power_cf(input_cp_ext, cp_ext_len);
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input_cp_ext += q->fft_size+cp_ext_len;
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}
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if (C_ext > 0) {
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M_ext = R_ext/C_ext;
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}
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q->M_ext_avg = SRSLTE_VEC_EMA(M_ext/nof_symbols, q->M_ext_avg, CP_EMA_ALPHA);
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if (q->M_norm_avg > q->M_ext_avg) {
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return SRSLTE_CP_NORM;
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} else if (q->M_norm_avg < q->M_ext_avg) {
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return SRSLTE_CP_EXT;
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} else {
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if (R_norm > R_ext) {
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return SRSLTE_CP_NORM;
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} else {
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return SRSLTE_CP_EXT;
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}
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}
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} else {
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return SRSLTE_CP_NORM;
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}
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}
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/* Returns 1 if the SSS is found, 0 if not and -1 if there is not enough space
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* to correlate
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*/
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int sync_sss(srslte_sync_t *q, cf_t *input, uint32_t peak_pos, srslte_cp_t cp) {
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int sss_idx, ret;
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srslte_sss_synch_set_N_id_2(&q->sss, q->N_id_2);
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/* Make sure we have enough room to find SSS sequence */
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sss_idx = (int) peak_pos-2*q->fft_size-SRSLTE_CP_LEN(q->fft_size, (SRSLTE_CP_ISNORM(q->cp)?SRSLTE_CP_NORM_LEN:SRSLTE_CP_EXT_LEN));
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if (sss_idx < 0) {
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DEBUG("Not enough room to decode SSS (sss_idx=%d, peak_pos=%d)\n", sss_idx, peak_pos);
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return SRSLTE_ERROR;
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}
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DEBUG("Searching SSS around sss_idx: %d, peak_pos: %d\n", sss_idx, peak_pos);
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switch(q->sss_alg) {
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case SSS_DIFF:
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srslte_sss_synch_m0m1_diff(&q->sss, &input[sss_idx], &q->m0, &q->m0_value, &q->m1, &q->m1_value);
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break;
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case SSS_PARTIAL_3:
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srslte_sss_synch_m0m1_partial(&q->sss, &input[sss_idx], 3, NULL, &q->m0, &q->m0_value, &q->m1, &q->m1_value);
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break;
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case SSS_FULL:
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srslte_sss_synch_m0m1_partial(&q->sss, &input[sss_idx], 1, NULL, &q->m0, &q->m0_value, &q->m1, &q->m1_value);
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break;
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}
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q->sf_idx = srslte_sss_synch_subframe(q->m0, q->m1);
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ret = srslte_sss_synch_N_id_1(&q->sss, q->m0, q->m1);
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if (ret >= 0) {
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q->N_id_1 = (uint32_t) ret;
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DEBUG("SSS detected N_id_1=%d, sf_idx=%d, %s CP\n",
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q->N_id_1, q->sf_idx, SRSLTE_CP_ISNORM(q->cp)?"Normal":"Extended");
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return 1;
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} else {
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q->N_id_1 = 1000;
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return SRSLTE_SUCCESS;
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}
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}
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srslte_pss_synch_t* srslte_sync_get_cur_pss_obj(srslte_sync_t *q) {
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srslte_pss_synch_t *pss_obj[3] = {&q->pss_i[0], &q->pss, &q->pss_i[1]};
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return pss_obj[q->cfo_i+1];
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}
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static float cfo_estimate(srslte_sync_t *q, cf_t *input) {
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uint32_t cp_offset = 0;
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cp_offset = srslte_cp_synch(&q->cp_synch, input, q->max_offset, 2, SRSLTE_CP_LEN_NORM(1,q->fft_size));
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cf_t cp_corr_max = srslte_cp_synch_corr_output(&q->cp_synch, cp_offset);
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float cfo = -carg(cp_corr_max) / M_PI / 2;
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return cfo;
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}
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static int cfo_i_estimate(srslte_sync_t *q, cf_t *input, int find_offset, int *peak_pos) {
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float peak_value;
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float max_peak_value = -99;
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int max_cfo_i = 0;
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srslte_pss_synch_t *pss_obj[3] = {&q->pss_i[0], &q->pss, &q->pss_i[1]};
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for (int cfo_i=0;cfo_i<3;cfo_i++) {
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srslte_pss_synch_set_N_id_2(pss_obj[cfo_i], q->N_id_2);
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int p = srslte_pss_synch_find_pss(pss_obj[cfo_i], &input[find_offset], &peak_value);
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if (peak_value > max_peak_value) {
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max_peak_value = peak_value;
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if (peak_pos) {
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*peak_pos = p;
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}
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q->peak_value = peak_value;
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max_cfo_i = cfo_i-1;
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}
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}
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return max_cfo_i;
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}
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float srslte_sync_cfo_estimate(srslte_sync_t *q, cf_t *input, int find_offset) {
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float cfo_f = cfo_estimate(q, input);
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int cfo_i = 0;
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if (q->find_cfo_i) {
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cfo_i = cfo_i_estimate(q, input, find_offset, NULL);
|
|
}
|
|
return (float) cfo_i + cfo_f;
|
|
}
|
|
|
|
/** Finds the PSS sequence previously defined by a call to srslte_sync_set_N_id_2()
|
|
* around the position find_offset in the buffer input.
|
|
* Returns 1 if the correlation peak exceeds the threshold set by srslte_sync_set_threshold()
|
|
* or 0 otherwise. Returns a negative number on error (if N_id_2 has not been set)
|
|
*
|
|
* The maximum of the correlation peak is always stored in *peak_position
|
|
*/
|
|
srslte_sync_find_ret_t srslte_sync_find(srslte_sync_t *q, cf_t *input, uint32_t find_offset, uint32_t *peak_position)
|
|
{
|
|
|
|
srslte_sync_find_ret_t ret = SRSLTE_SYNC_ERROR;
|
|
|
|
if (!q) {
|
|
return SRSLTE_ERROR_INVALID_INPUTS;
|
|
}
|
|
|
|
if (input != NULL &&
|
|
srslte_N_id_2_isvalid(q->N_id_2) &&
|
|
fft_size_isvalid(q->fft_size))
|
|
{
|
|
int peak_pos = 0;
|
|
|
|
ret = SRSLTE_SUCCESS;
|
|
|
|
if (peak_position) {
|
|
*peak_position = 0;
|
|
}
|
|
|
|
cf_t *input_cfo = input;
|
|
|
|
if (q->enable_cfo_corr) {
|
|
float cfo = cfo_estimate(q, input);
|
|
|
|
/* compute exponential moving average CFO */
|
|
q->mean_cfo = SRSLTE_VEC_EMA(cfo, q->mean_cfo, q->cfo_ema_alpha);
|
|
|
|
/* Correct CFO with the averaged CFO estimation */
|
|
srslte_cfo_correct(&q->cfocorr2, input, q->temp, -q->mean_cfo / q->fft_size);
|
|
|
|
input_cfo = q->temp;
|
|
}
|
|
|
|
/* If integer CFO is enabled, find max PSS correlation for shifted +1/0/-1 integer versions */
|
|
if (q->find_cfo_i && q->enable_cfo_corr) {
|
|
q->cfo_i = cfo_i_estimate(q, input_cfo, find_offset, &peak_pos);
|
|
if (q->cfo_i != 0) {
|
|
srslte_vec_prod_ccc(input_cfo, q->cfo_i_corr[q->cfo_i<0?0:1], input_cfo, q->frame_size);
|
|
INFO("Compensating cfo_i=%d\n", q->cfo_i);
|
|
}
|
|
} else {
|
|
srslte_pss_synch_set_N_id_2(&q->pss, q->N_id_2);
|
|
peak_pos = srslte_pss_synch_find_pss(&q->pss, &input_cfo[find_offset], &q->peak_value);
|
|
// this compensates for the constant time shift caused by the low pass filter
|
|
if(q->decimate && peak_pos < 0)
|
|
{
|
|
peak_pos = 0 ;//peak_pos + q->decimate*(2);// replace 2 with q->filter_size -2;
|
|
}
|
|
if (peak_pos < 0) {
|
|
fprintf(stderr, "Error calling finding PSS sequence at : %d \n", peak_pos);
|
|
return SRSLTE_ERROR;
|
|
}
|
|
}
|
|
|
|
if (peak_position) {
|
|
*peak_position = (uint32_t) peak_pos;
|
|
}
|
|
|
|
// Try to detect SSS
|
|
if (q->sss_en) {
|
|
// Set an invalid N_id_1 indicating SSS is yet to be detected
|
|
q->N_id_1 = 1000;
|
|
|
|
if (sync_sss(q, input_cfo, find_offset + peak_pos, q->cp) < 0) {
|
|
DEBUG("No space for SSS processing. Frame starts at %d\n", peak_pos);
|
|
}
|
|
}
|
|
|
|
/* If peak is over threshold, compute CFO and SSS */
|
|
if (q->peak_value >= q->threshold) {
|
|
|
|
if (q->detect_cp) {
|
|
if (peak_pos + find_offset >= 2*(q->fft_size + SRSLTE_CP_LEN_EXT(q->fft_size))) {
|
|
srslte_sync_set_cp(q, srslte_sync_detect_cp(q, input_cfo, peak_pos + find_offset));
|
|
} else {
|
|
DEBUG("Not enough room to detect CP length. Peak position: %d\n", peak_pos);
|
|
}
|
|
}
|
|
|
|
if (peak_pos + find_offset >= 2*(q->fft_size + SRSLTE_CP_LEN_EXT(q->fft_size))) {
|
|
float cfo2 = srslte_pss_synch_cfo_compute(&q->pss, &input[find_offset + peak_pos - q->fft_size]);
|
|
q->mean_cfo2 = SRSLTE_VEC_EMA(cfo2, q->mean_cfo2, q->cfo_ema_alpha);
|
|
|
|
ret = SRSLTE_SYNC_FOUND;
|
|
} else {
|
|
ret = SRSLTE_SYNC_FOUND_NOSPACE;
|
|
}
|
|
} else {
|
|
ret = SRSLTE_SYNC_NOFOUND;
|
|
}
|
|
|
|
DEBUG("SYNC ret=%d N_id_2=%d find_offset=%d frame_len=%d, pos=%d peak=%.2f threshold=%.2f sf_idx=%d, CFO=%.3f kHz\n",
|
|
ret, q->N_id_2, find_offset, q->frame_size, peak_pos, q->peak_value,
|
|
q->threshold, q->sf_idx, 15*(q->cfo_i+q->mean_cfo));
|
|
|
|
} else if (srslte_N_id_2_isvalid(q->N_id_2)) {
|
|
fprintf(stderr, "Must call srslte_sync_set_N_id_2() first!\n");
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
void srslte_sync_reset(srslte_sync_t *q) {
|
|
q->M_ext_avg = 0;
|
|
q->M_norm_avg = 0;
|
|
srslte_pss_synch_reset(&q->pss);
|
|
}
|