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@ -25,6 +25,7 @@
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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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@ -36,7 +37,7 @@
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#include "srslte/sync/cfo.h"
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#define MEANPEAK_EMA_ALPHA 0.2
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#define CFO_EMA_ALPHA 0.1
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#define CFO_EMA_ALPHA 0.9
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#define CP_EMA_ALPHA 0.2
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static bool fft_size_isvalid(uint32_t fft_size) {
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@ -47,7 +48,7 @@ static bool fft_size_isvalid(uint32_t fft_size) {
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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 fft_size) {
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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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int ret = SRSLTE_ERROR_INVALID_INPUTS;
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@ -59,18 +60,30 @@ int srslte_sync_init(srslte_sync_t *q, uint32_t frame_size, uint32_t fft_size) {
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bzero(q, sizeof(srslte_sync_t));
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q->detect_cp = true;
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q->cp = SRSLTE_CP_NORM;
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q->mean_peak_value = 0.0;
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q->sss_en = true;
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q->correct_cfo = true;
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q->mean_cfo = 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->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_PARTIAL_3;
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if (srslte_pss_synch_init_fft(&q->pss, frame_size, 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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srslte_sync_set_cp(q, SRSLTE_CP_NORM);
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if (srslte_pss_synch_init_fft(&q->pss, max_offset, fft_size)) {
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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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@ -84,7 +97,12 @@ int srslte_sync_init(srslte_sync_t *q, uint32_t frame_size, uint32_t fft_size) {
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goto clean_exit;
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}
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DEBUG("SYNC init with frame_size=%d and fft_size=%d\n", frame_size, fft_size);
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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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@ -103,6 +121,13 @@ void srslte_sync_free(srslte_sync_t *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_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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}
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}
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@ -110,6 +135,19 @@ 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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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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}
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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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@ -141,13 +179,21 @@ uint32_t srslte_sync_get_sf_idx(srslte_sync_t *q) {
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}
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float srslte_sync_get_cfo(srslte_sync_t *q) {
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return q->mean_cfo;
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return q->mean_cfo + 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_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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@ -156,10 +202,6 @@ float srslte_sync_get_peak_value(srslte_sync_t *q) {
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return q->mean_peak_value;
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}
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void srslte_sync_correct_cfo(srslte_sync_t *q, bool enabled) {
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q->correct_cfo = enabled;
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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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@ -177,6 +219,8 @@ srslte_cp_t srslte_sync_get_cp(srslte_sync_t *q) {
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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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q->nof_symbols = q->frame_size/(q->fft_size+q->cp_len)-1;
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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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@ -272,6 +316,10 @@ int sync_sss(srslte_sync_t *q, cf_t *input, uint32_t peak_pos, srslte_cp_t cp) {
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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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/** Finds the PSS sequence previously defined by a call to srslte_sync_set_N_id_2()
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* around the position find_offset in the buffer input.
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@ -298,12 +346,61 @@ int srslte_sync_find(srslte_sync_t *q, cf_t *input, uint32_t find_offset, uint32
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*peak_position = 0;
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}
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/* Estimate CFO using CP */
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uint32_t cp_offset = srslte_cp_synch(&q->cp_synch, input, q->nof_symbols, q->nof_symbols, 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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/* compute cumulative moving average CFO */
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DEBUG("cp_offset_pos=%d, abs=%f, cfo=%f, mean_cfo=%f, nof_symb=%d\n",
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cp_offset, cabs(cp_corr_max), cfo, q->mean_cfo, q->nof_symbols);
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if (q->mean_cfo) {
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q->mean_cfo = SRSLTE_VEC_EMA(cfo, q->mean_cfo, q->cfo_ema_alpha);
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} else {
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q->mean_cfo = cfo;
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}
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/* Correct CFO with the averaged CFO estimation */
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float correct_cfo = q->mean_cfo;
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if (!q->find_cfo_i) {
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correct_cfo = q->cfo_i + q->mean_cfo;
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DEBUG("cfo_i disabled, correct_cfo=%d+%f=%f\n",q->cfo_i, q->mean_cfo, correct_cfo);
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}
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srslte_cfo_correct(&q->cfocorr, input, input, -correct_cfo / q->fft_size);
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srslte_pss_synch_set_N_id_2(&q->pss, q->N_id_2);
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peak_pos = srslte_pss_synch_find_pss(&q->pss, &input[find_offset], &q->peak_value);
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if (peak_pos < 0) {
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fprintf(stderr, "Error calling finding PSS sequence\n");
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return SRSLTE_ERROR;
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if (q->find_cfo_i) {
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float peak_value;
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float max_peak_value = -99;
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peak_pos = 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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peak_pos = p;
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q->peak_value = peak_value;
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q->cfo_i = cfo_i-1;
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}
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}
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if (q->cfo_i != 0) {
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correct_cfo = q->cfo_i+q->mean_cfo;
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srslte_vec_prod_ccc(input, q->cfo_i_corr[q->cfo_i<0?0:1], input, q->frame_size);
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DEBUG("Compensating cfo_i=%d, total_cfo=%f\n", q->cfo_i, correct_cfo);
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}
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} else {
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peak_pos = srslte_pss_synch_find_pss(&q->pss, &input[find_offset], &q->peak_value);
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if (peak_pos < 0) {
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fprintf(stderr, "Error calling finding PSS sequence\n");
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return SRSLTE_ERROR;
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}
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if (q->max_offset<128) {
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float temp[128];
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srslte_vec_sc_prod_fff(q->pss.conv_output_avg, 1e8, temp, q->max_offset);
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srslte_vec_fprint_f(stdout, temp, q->max_offset);
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}
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}
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q->mean_peak_value = SRSLTE_VEC_EMA(q->peak_value, q->mean_peak_value, MEANPEAK_EMA_ALPHA);
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@ -314,21 +411,6 @@ int srslte_sync_find(srslte_sync_t *q, cf_t *input, uint32_t find_offset, uint32
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/* If peak is over threshold, compute CFO and SSS */
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if (q->peak_value >= q->threshold) {
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// Make sure we have enough space to estimate CFO
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if (peak_pos + find_offset >= q->fft_size) {
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float cfo = srslte_pss_synch_cfo_compute(&q->pss, &input[find_offset+peak_pos-q->fft_size]);
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/* compute cumulative moving average CFO */
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q->mean_cfo = SRSLTE_VEC_EMA(cfo, q->mean_cfo, CFO_EMA_ALPHA);
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} else {
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DEBUG("No space for CFO computation. Frame starts at \n",peak_pos);
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}
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/* Correct CFO with the averaged CFO estimation */
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if (q->correct_cfo) {
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srslte_cfo_correct(&q->cfocorr, input, input, -q->mean_cfo / q->fft_size);
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}
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// Try to detect SSS
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if (q->sss_en) {
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// Set an invalid N_id_1 indicating SSS is yet to be detected
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@ -341,7 +423,7 @@ int srslte_sync_find(srslte_sync_t *q, cf_t *input, uint32_t find_offset, uint32
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if (q->detect_cp) {
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if (peak_pos + find_offset >= 2*(q->fft_size + SRSLTE_CP_LEN_EXT(q->fft_size))) {
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q->cp = srslte_sync_detect_cp(q, input, peak_pos + find_offset);
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srslte_sync_set_cp(q, srslte_sync_detect_cp(q, input, peak_pos + find_offset));
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} else {
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DEBUG("Not enough room to detect CP length. Peak position: %d\n", peak_pos);
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}
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@ -354,7 +436,7 @@ int srslte_sync_find(srslte_sync_t *q, cf_t *input, uint32_t find_offset, uint32
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}
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DEBUG("SYNC ret=%d N_id_2=%d find_offset=%d pos=%d peak=%.2f threshold=%.2f sf_idx=%d, CFO=%.3f KHz\n",
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ret, q->N_id_2, find_offset, peak_pos, q->peak_value, q->threshold, q->sf_idx, 15*q->mean_cfo);
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ret, q->N_id_2, find_offset, peak_pos, q->peak_value, q->threshold, q->sf_idx, 15*correct_cfo);
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} else if (srslte_N_id_2_isvalid(q->N_id_2)) {
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fprintf(stderr, "Must call srslte_sync_set_N_id_2() first!\n");
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ismagom
9 years ago