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Minor AGC bugfix in dB conversion (#817)

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* Fix issue in AGC confusing dB with linear
* Minor esthetic changes
master
Ismael Gomez 5 years ago committed by GitHub
parent 3159a5b84a 969e0e211d
commit be60b78ceb
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
8 changed files with 54 additions and 51 deletions
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10
lib/examples/pdsch_enodeb.c
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@ -835,15 +835,15 @@ int main(int argc, char **argv) {
#endif #endif
ZERO_OBJECT(pdsch_cfg); ZERO_OBJECT(pdsch_cfg);
for (uint32_t i = 0; i < SRSLTE_MAX_CODEWORDS; i++) { for (uint32_t j = 0; j < SRSLTE_MAX_CODEWORDS; j++) {
pdsch_cfg.softbuffers.tx[i] = softbuffers[i]; pdsch_cfg.softbuffers.tx[j] = softbuffers[j];
} }
pdsch_cfg.rnti = UE_CRNTI; pdsch_cfg.rnti = UE_CRNTI;
pmch_cfg.pdsch_cfg = pdsch_cfg; pmch_cfg.pdsch_cfg = pdsch_cfg;
while ((nf < nof_frames || nof_frames == -1) && !go_exit) { while ((nf < nof_frames || nof_frames == -1) && !go_exit) {
for (sf_idx = 0; sf_idx < SRSLTE_NOF_SF_X_FRAME && (nf < nof_frames || nof_frames == -1); sf_idx++) { for (sf_idx = 0; sf_idx < SRSLTE_NOF_SF_X_FRAME && (nf < nof_frames || nof_frames == -1) && !go_exit; sf_idx++) {
/* Set Antenna port resource elements to zero */ /* Set Antenna port resource elements to zero */
bzero(sf_symbols[0], sizeof(cf_t) * sf_n_re); bzero(sf_symbols[0], sizeof(cf_t) * sf_n_re);
@ -960,8 +960,8 @@ int main(int argc, char **argv) {
exit(-1); exit(-1);
} }
for (int i = 0; i < pmch_cfg.pdsch_cfg.grant.tb[0].tbs / 8; i++) { for (int j = 0; j < pmch_cfg.pdsch_cfg.grant.tb[0].tbs / 8; j++) {
data_mbms[i] = i % 255; data_mbms[j] = j % 255;
} }
pmch_cfg.area_id = mbsfn_area_id; pmch_cfg.area_id = mbsfn_area_id;

8
lib/include/srslte/phy/agc/agc.h
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@ -48,8 +48,8 @@ typedef enum SRSLTE_API {
typedef struct SRSLTE_API{ typedef struct SRSLTE_API{
float bandwidth; float bandwidth;
float gain; float gain;
float min_gain; float min_gain_db;
float max_gain; float max_gain_db;
float y_out; float y_out;
bool lock; bool lock;
bool isfirst; bool isfirst;
@ -76,7 +76,7 @@ SRSLTE_API void srslte_agc_free(srslte_agc_t *q);
SRSLTE_API void srslte_agc_reset(srslte_agc_t *q); SRSLTE_API void srslte_agc_reset(srslte_agc_t *q);
SRSLTE_API void srslte_agc_set_gain_range(srslte_agc_t* q, float min_gain, float max_gain); SRSLTE_API void srslte_agc_set_gain_range(srslte_agc_t *q, float min_gain_db, float max_gain_db);
SRSLTE_API void srslte_agc_set_bandwidth(srslte_agc_t *q, SRSLTE_API void srslte_agc_set_bandwidth(srslte_agc_t *q,
float bandwidth); float bandwidth);
@ -91,7 +91,7 @@ SRSLTE_API float srslte_agc_get_output_level(srslte_agc_t *q);
SRSLTE_API float srslte_agc_get_gain(srslte_agc_t *q); SRSLTE_API float srslte_agc_get_gain(srslte_agc_t *q);
SRSLTE_API void srslte_agc_set_gain(srslte_agc_t *q, SRSLTE_API void srslte_agc_set_gain(srslte_agc_t *q,
float init_gain_value); float init_gain_value_db);
SRSLTE_API void srslte_agc_lock(srslte_agc_t *q, SRSLTE_API void srslte_agc_lock(srslte_agc_t *q,
bool enable); bool enable);

25
lib/src/phy/agc/agc.c
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@ -39,8 +39,8 @@ int srslte_agc_init_acc(srslte_agc_t *q, srslte_agc_mode_t mode, uint32_t nof_fr
bzero(q, sizeof(srslte_agc_t)); bzero(q, sizeof(srslte_agc_t));
q->mode = mode; q->mode = mode;
q->nof_frames = nof_frames; q->nof_frames = nof_frames;
q->max_gain = 90.0; q->max_gain_db = 90.0;
q->min_gain = 0.0; q->min_gain_db = 0.0;
if (nof_frames > 0) { if (nof_frames > 0) {
q->y_tmp = srslte_vec_malloc(sizeof(float) * nof_frames); q->y_tmp = srslte_vec_malloc(sizeof(float) * nof_frames);
if (!q->y_tmp) { if (!q->y_tmp) {
@ -87,11 +87,10 @@ void srslte_agc_reset(srslte_agc_t *q) {
} }
} }
void srslte_agc_set_gain_range(srslte_agc_t* q, float min_gain, float max_gain) void srslte_agc_set_gain_range(srslte_agc_t *q, float min_gain_db, float max_gain_db) {
{
if (q) { if (q) {
q->min_gain = min_gain; q->min_gain_db = min_gain_db;
q->max_gain = max_gain; q->max_gain_db = max_gain_db;
} }
} }
@ -115,8 +114,8 @@ float srslte_agc_get_gain(srslte_agc_t *q) {
return q->gain; return q->gain;
} }
void srslte_agc_set_gain(srslte_agc_t *q, float init_gain_value) { void srslte_agc_set_gain(srslte_agc_t *q, float init_gain_value_db) {
q->gain = init_gain_value; q->gain = srslte_convert_dB_to_power(init_gain_value_db);
} }
void srslte_agc_lock(srslte_agc_t *q, bool enable) { void srslte_agc_lock(srslte_agc_t *q, bool enable) {
@ -133,14 +132,14 @@ void srslte_agc_process(srslte_agc_t *q, cf_t *signal, uint32_t len) {
if (!q->uhd_handler) { if (!q->uhd_handler) {
srslte_vec_sc_prod_cfc(signal, q->gain, signal, len); srslte_vec_sc_prod_cfc(signal, q->gain, signal, len);
} else { } else {
if (gain_db < q->min_gain) { if (gain_db < q->min_gain_db) {
gain_db = q->min_gain + 5.0; gain_db = q->min_gain_db + 5.0;
INFO("Warning: Rx signal strength is too high. Forcing minimum Rx gain %.2fdB\n", gain_db); INFO("Warning: Rx signal strength is too high. Forcing minimum Rx gain %.2fdB\n", gain_db);
} else if (gain_db > q->max_gain) { } else if (gain_db > q->max_gain_db) {
gain_db = q->max_gain; gain_db = q->max_gain_db;
INFO("Warning: Rx signal strength is too weak. Forcing maximum Rx gain %.2fdB\n", gain_db); INFO("Warning: Rx signal strength is too weak. Forcing maximum Rx gain %.2fdB\n", gain_db);
} else if (isinf(gain_db) || isnan(gain_db)) { } else if (isinf(gain_db) || isnan(gain_db)) {
gain_db = (q->min_gain + q->max_gain) / 2.0; gain_db = (q->min_gain_db + q->max_gain_db) / 2.0;
INFO("Warning: AGC went to an unknown state. Setting Rx gain to %.2fdB\n", gain_db); INFO("Warning: AGC went to an unknown state. Setting Rx gain to %.2fdB\n", gain_db);
} }

6
lib/src/phy/rf/rf_utils.c
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@ -184,12 +184,13 @@ int rf_cell_search(srslte_rf_t *rf, uint32_t nof_rx_antennas,
} else { } else {
ret = srslte_ue_cellsearch_scan(&cs, found_cells, &max_peak_cell); ret = srslte_ue_cellsearch_scan(&cs, found_cells, &max_peak_cell);
} }
if (ret < 0) {
srslte_rf_stop_rx_stream(rf); srslte_rf_stop_rx_stream(rf);
if (ret < 0) {
ERROR("Error searching cell\n"); ERROR("Error searching cell\n");
return SRSLTE_ERROR; return SRSLTE_ERROR;
} else if (ret == 0) { } else if (ret == 0) {
srslte_rf_stop_rx_stream(rf);
ERROR("Could not find any cell in this frequency\n"); ERROR("Could not find any cell in this frequency\n");
return SRSLTE_SUCCESS; return SRSLTE_SUCCESS;
} }
@ -221,7 +222,6 @@ int rf_cell_search(srslte_rf_t *rf, uint32_t nof_rx_antennas,
*cfo = found_cells[max_peak_cell].cfo; *cfo = found_cells[max_peak_cell].cfo;
} }
srslte_rf_stop_rx_stream(rf);
srslte_ue_cellsearch_free(&cs); srslte_ue_cellsearch_free(&cs);
return ret; return ret;

10
lib/src/phy/sync/sync.c
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@ -321,7 +321,7 @@ static void generate_freq_sss(srslte_sync_t* q, uint32_t N_id_1)
srslte_dft_run_c(&q->idftp_sss, symbol, q->sss_signal[n]); srslte_dft_run_c(&q->idftp_sss, symbol, q->sss_signal[n]);
} }
q->sss_generated = true; q->sss_generated = true;
INFO("Generated SSS for N_id_1=%d, cell_id=%d\n", N_id_1, cell_id); DEBUG("Generated SSS for N_id_1=%d, cell_id=%d\n", N_id_1, cell_id);
} }
int srslte_sync_set_N_id_1(srslte_sync_t* q, uint32_t N_id_1) int srslte_sync_set_N_id_1(srslte_sync_t* q, uint32_t N_id_1)
@ -523,7 +523,7 @@ static bool sync_sss_symbol(srslte_sync_t* q, const cf_t* input, uint32_t* sf_id
} }
*N_id_1 = q->N_id_1; *N_id_1 = q->N_id_1;
*corr = ratio; *corr = ratio;
INFO("SSS correlation with N_id_1=%d, sf0=%.2f, sf5=%.2f, sf_idx=%d, ratio=%.1f\n", DEBUG("SSS correlation with N_id_1=%d, sf0=%.2f, sf5=%.2f, sf_idx=%d, ratio=%.1f\n",
q->N_id_1, q->N_id_1,
res[0], res[0],
res[1], res[1],
@ -668,7 +668,7 @@ srslte_sync_find_ret_t srslte_sync_find(srslte_sync_t *q, const cf_t *input, uin
q->cfo_cp_mean = SRSLTE_VEC_EMA(cfo_cp, q->cfo_cp_mean, q->cfo_ema_alpha); q->cfo_cp_mean = SRSLTE_VEC_EMA(cfo_cp, q->cfo_cp_mean, q->cfo_ema_alpha);
} }
INFO("CP-CFO: estimated=%f, mean=%f\n", cfo_cp, q->cfo_cp_mean); DEBUG("CP-CFO: estimated=%f, mean=%f\n", cfo_cp, q->cfo_cp_mean);
/* Correct CFO with the averaged CFO estimation */ /* Correct CFO with the averaged CFO estimation */
srslte_cfo_correct(&q->cfo_corr_frame, input_ptr, q->temp, -q->cfo_cp_mean / q->fft_size); srslte_cfo_correct(&q->cfo_corr_frame, input_ptr, q->temp, -q->cfo_cp_mean / q->fft_size);
@ -686,7 +686,7 @@ srslte_sync_find_ret_t srslte_sync_find(srslte_sync_t *q, const cf_t *input, uin
} }
} }
INFO("PSS: id=%d, peak_pos=%d, peak_value=%f\n", q->N_id_2, peak_pos, q->peak_value); DEBUG("PSS: id=%d, peak_pos=%d, peak_value=%f\n", q->N_id_2, peak_pos, q->peak_value);
// Save peak position // Save peak position
if (peak_position) { if (peak_position) {
@ -719,7 +719,7 @@ srslte_sync_find_ret_t srslte_sync_find(srslte_sync_t *q, const cf_t *input, uin
q->cfo_pss_mean = SRSLTE_VEC_EMA(q->cfo_pss, q->cfo_pss_mean, q->cfo_ema_alpha); q->cfo_pss_mean = SRSLTE_VEC_EMA(q->cfo_pss, q->cfo_pss_mean, q->cfo_ema_alpha);
} }
INFO("PSS-CFO: filter=%s, estimated=%f, mean=%f\n", DEBUG("PSS-CFO: filter=%s, estimated=%f, mean=%f\n",
q->pss_filtering_enabled ? "yes" : "no", q->pss_filtering_enabled ? "yes" : "no",
q->cfo_pss, q->cfo_pss,
q->cfo_pss_mean); q->cfo_pss_mean);

4
lib/src/phy/ue/ue_cell_search.c
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@ -121,6 +121,7 @@ int srslte_ue_cellsearch_init_multi(srslte_ue_cellsearch_t* q,
for (int i = 0; i < nof_rx_antennas; i++) { for (int i = 0; i < nof_rx_antennas; i++) {
q->sf_buffer[i] = srslte_vec_malloc(3 * sizeof(cf_t) * SRSLTE_SF_LEN_PRB(100)); q->sf_buffer[i] = srslte_vec_malloc(3 * sizeof(cf_t) * SRSLTE_SF_LEN_PRB(100));
bzero(q->sf_buffer[i], 3 * sizeof(cf_t) * SRSLTE_SF_LEN_PRB(100));
} }
q->nof_rx_antennas = nof_rx_antennas; q->nof_rx_antennas = nof_rx_antennas;
@ -263,6 +264,7 @@ int srslte_ue_cellsearch_scan(srslte_ue_cellsearch_t * q,
uint32_t nof_detected_cells = 0; uint32_t nof_detected_cells = 0;
for (uint32_t N_id_2=0;N_id_2<3 && ret >= 0;N_id_2++) { for (uint32_t N_id_2=0;N_id_2<3 && ret >= 0;N_id_2++) {
INFO("CELL SEARCH: Starting scan for N_id_2=%d\n", N_id_2);
ret = srslte_ue_cellsearch_scan_N_id_2(q, N_id_2, &found_cells[N_id_2]); ret = srslte_ue_cellsearch_scan_N_id_2(q, N_id_2, &found_cells[N_id_2]);
if (ret < 0) { if (ret < 0) {
ERROR("Error searching cell\n"); ERROR("Error searching cell\n");
@ -319,7 +321,7 @@ int srslte_ue_cellsearch_scan_N_id_2(srslte_ue_cellsearch_t * q,
q->candidates[nof_detected_frames].psr = srslte_sync_get_peak_value(&q->ue_sync.sfind); q->candidates[nof_detected_frames].psr = srslte_sync_get_peak_value(&q->ue_sync.sfind);
q->candidates[nof_detected_frames].cfo = 15000 * srslte_sync_get_cfo(&q->ue_sync.sfind); q->candidates[nof_detected_frames].cfo = 15000 * srslte_sync_get_cfo(&q->ue_sync.sfind);
q->candidates[nof_detected_frames].frame_type = srslte_ue_sync_get_frame_type(&q->ue_sync); q->candidates[nof_detected_frames].frame_type = srslte_ue_sync_get_frame_type(&q->ue_sync);
DEBUG("CELL SEARCH: [%d/%d/%d]: Found peak PSR=%.3f, Cell_id: %d CP: %s, CFO=%.1f KHz\n", INFO("CELL SEARCH: [%d/%d/%d]: Found peak PSR=%.3f, Cell_id: %d CP: %s, CFO=%.1f KHz\n",
nof_detected_frames, nof_detected_frames,
nof_scanned_frames, nof_scanned_frames,
q->nof_valid_frames, q->nof_valid_frames,

4
lib/src/phy/ue/ue_mib.c
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@ -160,12 +160,12 @@ int srslte_ue_mib_decode(srslte_ue_mib_t * q,
if (ret < 0) { if (ret < 0) {
ERROR("Error decoding PBCH (%d)\n", ret); ERROR("Error decoding PBCH (%d)\n", ret);
} else if (ret == 1) { } else if (ret == 1) {
INFO("MIB decoded: %u\n", q->frame_cnt); INFO("MIB decoded: %u, snr=%.1f dB\n", q->frame_cnt, q->chest_res.snr_db);
srslte_ue_mib_reset(q); srslte_ue_mib_reset(q);
ret = SRSLTE_UE_MIB_FOUND; ret = SRSLTE_UE_MIB_FOUND;
} else { } else {
ret = SRSLTE_UE_MIB_NOTFOUND; ret = SRSLTE_UE_MIB_NOTFOUND;
INFO("MIB not decoded: %u\n", q->frame_cnt); INFO("MIB not decoded: %u, snr=%.1f dB\n", q->frame_cnt, q->chest_res.snr_db);
q->frame_cnt++; q->frame_cnt++;
} }

22
lib/src/phy/ue/ue_sync.c
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@ -138,15 +138,14 @@ void srslte_ue_sync_reset(srslte_ue_sync_t *q) {
int srslte_ue_sync_start_agc(srslte_ue_sync_t *q, int srslte_ue_sync_start_agc(srslte_ue_sync_t *q,
float (set_gain_callback)(void *, float), float (set_gain_callback)(void *, float),
float min_gain, float min_gain_db,
float max_gain, float max_gain_db,
float init_gain_value) float init_gain_value_db) {
{
int n = srslte_agc_init_uhd(&q->agc, SRSLTE_AGC_MODE_PEAK_AMPLITUDE, 0, set_gain_callback, q->stream); int n = srslte_agc_init_uhd(&q->agc, SRSLTE_AGC_MODE_PEAK_AMPLITUDE, 0, set_gain_callback, q->stream);
q->do_agc = n==0?true:false; q->do_agc = n==0?true:false;
if (q->do_agc) { if (q->do_agc) {
srslte_agc_set_gain_range(&q->agc, min_gain, max_gain); srslte_agc_set_gain_range(&q->agc, min_gain_db, max_gain_db);
srslte_agc_set_gain(&q->agc, init_gain_value); srslte_agc_set_gain(&q->agc, init_gain_value_db);
srslte_ue_sync_set_agc_period(q, 4); srslte_ue_sync_set_agc_period(q, 4);
} }
return n; return n;
@ -595,7 +594,7 @@ static int track_peak_ok(srslte_ue_sync_t* q, uint32_t track_idx)
/* Adjust current CFO estimation with PSS /* Adjust current CFO estimation with PSS
* Since sync track has enabled only PSS-based correlation, get_cfo() returns that value only, already filtered. * Since sync track has enabled only PSS-based correlation, get_cfo() returns that value only, already filtered.
*/ */
INFO("TRACK: cfo_current=%f, cfo_strack=%f\n", 15000*q->cfo_current_value, 15000*srslte_sync_get_cfo(&q->strack)); DEBUG("TRACK: cfo_current=%f, cfo_strack=%f\n", 15000*q->cfo_current_value, 15000*srslte_sync_get_cfo(&q->strack));
if (15000*fabsf(srslte_sync_get_cfo(&q->strack)) > q->cfo_pss_min) { if (15000*fabsf(srslte_sync_get_cfo(&q->strack)) > q->cfo_pss_min) {
q->cfo_current_value += srslte_sync_get_cfo(&q->strack)*q->cfo_loop_bw_pss; q->cfo_current_value += srslte_sync_get_cfo(&q->strack)*q->cfo_loop_bw_pss;
q->pss_stable_cnt = 0; q->pss_stable_cnt = 0;
@ -765,7 +764,8 @@ int srslte_ue_sync_zerocopy(srslte_ue_sync_t* q, cf_t* input_buffer[SRSLTE_MAX_P
srslte_agc_process(&q->agc, input_buffer[0], q->sf_len); srslte_agc_process(&q->agc, input_buffer[0], q->sf_len);
} }
INFO("SYNC FIND: sf_idx=%d, ret=%d, next_state=%d\n", q->sf_idx, ret, q->state); INFO("SYNC FIND: sf_idx=%d, ret=%d, peak_pos=%d, peak_value=%.2f, mean_cp_cfo=%.2f, mean_pss_cfo=%.2f, total_cfo_khz=%.1f\n", q->sf_idx, ret, q->peak_idx,
q->sfind.peak_value, q->sfind.cfo_cp_mean, q->sfind.cfo_pss_mean, 15 * srslte_sync_get_cfo(&q->sfind));
break; break;
case SF_TRACK: case SF_TRACK:
@ -829,10 +829,12 @@ int srslte_ue_sync_zerocopy(srslte_ue_sync_t* q, cf_t* input_buffer[SRSLTE_MAX_P
} }
q->frame_total_cnt++; q->frame_total_cnt++;
}
INFO("SYNC TRACK: sf_idx=%d, ret=%d, peak_pos=%d, peak_value=%.2f, mean_cp_cfo=%.2f, mean_pss_cfo=%.2f, total_cfo_khz=%.1f\n", q->sf_idx, ret, track_idx,
q->strack.peak_value, q->strack.cfo_cp_mean, q->strack.cfo_pss_mean, 15 * srslte_sync_get_cfo(&q->strack));
} else {
INFO("SYNC TRACK: sf_idx=%d, ret=%d, next_state=%d\n", q->sf_idx, ret, q->state); INFO("SYNC TRACK: sf_idx=%d, ret=%d, next_state=%d\n", q->sf_idx, ret, q->state);
}
break; break;
} }
} }

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