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srsRAN_4G
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simplify SL chest and add RSRP and sync error measurements

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master
Andre Puschmann 5 years ago
parent d85339187a
commit 8b70ff7654
2 changed files with 51 additions and 35 deletions
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6
lib/include/srslte/phy/ch_estimation/chest_sl.h
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@ -39,7 +39,8 @@
typedef struct { typedef struct {
uint32_t nof_prb; float sync_err;
float rsrp_corr;
uint32_t sf_n_re; uint32_t sf_n_re;
uint32_t M_sc_rs; uint32_t M_sc_rs;
@ -82,6 +83,9 @@ typedef struct {
srslte_interp_linsrslte_vec_t lin_vec_sl; srslte_interp_linsrslte_vec_t lin_vec_sl;
bool sync_error_enable;
bool rsrp_enable;
} srslte_chest_sl_t; } srslte_chest_sl_t;
SRSLTE_API int srslte_chest_sl_gen_dmrs(srslte_chest_sl_t* q, SRSLTE_API int srslte_chest_sl_gen_dmrs(srslte_chest_sl_t* q,

80
lib/src/phy/ch_estimation/chest_sl.c
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@ -72,6 +72,9 @@ int srslte_chest_sl_init_dmrs(srslte_chest_sl_t* q)
return SRSLTE_ERROR; return SRSLTE_ERROR;
} }
q->sync_error_enable = true;
q->rsrp_enable = true;
return SRSLTE_SUCCESS; return SRSLTE_SUCCESS;
} }
@ -631,43 +634,26 @@ void srslte_chest_sl_pscch_ls_estimate_equalize(srslte_chest_sl_t* q,
bzero(q->ce, sizeof(cf_t) * sf_n_re); bzero(q->ce, sizeof(cf_t) * sf_n_re);
if ((tm == SRSLTE_SIDELINK_TM1) || (tm == SRSLTE_SIDELINK_TM2)) { if ((tm == SRSLTE_SIDELINK_TM1) || (tm == SRSLTE_SIDELINK_TM2)) {
if (cp == SRSLTE_CP_NORM) { uint32_t dmrs_index = 0;
srslte_vec_prod_conj_ccc(&sf_buffer[3 * nof_prb * SRSLTE_NRE + prb_idx * SRSLTE_NRE], for (uint32_t i = 0; i < srslte_sl_get_num_symbols(tm, cp); i++) {
&q->r_sequence[0][0], if (srslte_pscch_is_symbol(SRSLTE_SIDELINK_DMRS_SYMBOL, tm, i, cp)) {
&q->ce[3 * nof_prb * SRSLTE_NRE + prb_idx * SRSLTE_NRE], srslte_vec_prod_conj_ccc(&sf_buffer[i * nof_prb * SRSLTE_NRE + prb_idx * SRSLTE_NRE],
q->M_sc_rs); &q->r_sequence[dmrs_index][0],
srslte_vec_prod_conj_ccc(&sf_buffer[10 * nof_prb * SRSLTE_NRE + prb_idx * SRSLTE_NRE], &q->ce[i * nof_prb * SRSLTE_NRE + prb_idx * SRSLTE_NRE],
&q->r_sequence[1][0], q->M_sc_rs);
&q->ce[10 * nof_prb * SRSLTE_NRE + prb_idx * SRSLTE_NRE], }
q->M_sc_rs);
} else {
srslte_vec_prod_conj_ccc(&sf_buffer[2 * nof_prb * SRSLTE_NRE + prb_idx * SRSLTE_NRE],
&q->r_sequence[0][0],
&q->ce[2 * nof_prb * SRSLTE_NRE + prb_idx * SRSLTE_NRE],
q->M_sc_rs);
srslte_vec_prod_conj_ccc(&sf_buffer[8 * nof_prb * SRSLTE_NRE + prb_idx * SRSLTE_NRE],
&q->r_sequence[1][0],
&q->ce[8 * nof_prb * SRSLTE_NRE + prb_idx * SRSLTE_NRE],
q->M_sc_rs);
} }
} else if ((tm == SRSLTE_SIDELINK_TM3) || (tm == SRSLTE_SIDELINK_TM4)) { } else if ((tm == SRSLTE_SIDELINK_TM3) || (tm == SRSLTE_SIDELINK_TM4)) {
if (cp == SRSLTE_CP_NORM) { if (cp == SRSLTE_CP_NORM) {
srslte_vec_prod_conj_ccc(&sf_buffer[2 * nof_prb * SRSLTE_NRE + prb_idx * SRSLTE_NRE], uint32_t dmrs_index = 0;
&q->r_sequence[0][0], for (uint32_t i = 0; i < srslte_sl_get_num_symbols(tm, cp); i++) {
&q->ce[2 * nof_prb * SRSLTE_NRE + prb_idx * SRSLTE_NRE], if (srslte_pscch_is_symbol(SRSLTE_SIDELINK_DMRS_SYMBOL, tm, i, cp)) {
q->M_sc_rs); srslte_vec_prod_conj_ccc(&sf_buffer[i * nof_prb * SRSLTE_NRE + prb_idx * SRSLTE_NRE],
srslte_vec_prod_conj_ccc(&sf_buffer[5 * nof_prb * SRSLTE_NRE + prb_idx * SRSLTE_NRE], &q->r_sequence[dmrs_index][0],
&q->r_sequence[1][0], &q->ce[i * nof_prb * SRSLTE_NRE + prb_idx * SRSLTE_NRE],
&q->ce[5 * nof_prb * SRSLTE_NRE + prb_idx * SRSLTE_NRE], q->M_sc_rs);
q->M_sc_rs); }
srslte_vec_prod_conj_ccc(&sf_buffer[8 * nof_prb * SRSLTE_NRE + prb_idx * SRSLTE_NRE], }
&q->r_sequence[2][0],
&q->ce[8 * nof_prb * SRSLTE_NRE + prb_idx * SRSLTE_NRE],
q->M_sc_rs);
srslte_vec_prod_conj_ccc(&sf_buffer[11 * nof_prb * SRSLTE_NRE + prb_idx * SRSLTE_NRE],
&q->r_sequence[3][0],
&q->ce[11 * nof_prb * SRSLTE_NRE + prb_idx * SRSLTE_NRE],
q->M_sc_rs);
} else { } else {
ERROR("Invalid CP"); ERROR("Invalid CP");
return; return;
@ -677,6 +663,32 @@ void srslte_chest_sl_pscch_ls_estimate_equalize(srslte_chest_sl_t* q,
return; return;
} }
// Estimate synchronization error
if (q->sync_error_enable) {
float k = (float)srslte_symbol_sz(nof_prb);
float sum = 0.0f;
for (uint32_t i = 0; i < srslte_sl_get_num_symbols(tm, cp); i++) {
if (srslte_pscch_is_symbol(SRSLTE_SIDELINK_DMRS_SYMBOL, tm, i, cp)) {
sum += srslte_vec_estimate_frequency(&q->ce[i * nof_prb * SRSLTE_NRE + prb_idx * SRSLTE_NRE], q->M_sc_rs) * k;
}
}
q->sync_err = sum / q->nof_dmrs_symbols;
} else {
q->sync_err = NAN;
}
// Compute RSRP for the channel estimates in this port
if (q->rsrp_enable) {
for (uint32_t i = 0; i < srslte_sl_get_num_symbols(tm, cp); i++) {
if (srslte_pscch_is_symbol(SRSLTE_SIDELINK_DMRS_SYMBOL, tm, i, cp)) {
cf_t corr = srslte_vec_acc_cc(&q->ce[i * nof_prb * SRSLTE_NRE + prb_idx * SRSLTE_NRE], q->M_sc_rs) / q->M_sc_rs;
float energy = __real__(corr * conjf(corr));
q->rsrp_corr = energy;
}
}
q->rsrp_corr /= q->nof_dmrs_symbols;
}
interpolate_pilots_sl_pscch(&q->lin_vec_sl, q->ce, nof_prb, prb_idx, tm, cp); interpolate_pilots_sl_pscch(&q->lin_vec_sl, q->ce, nof_prb, prb_idx, tm, cp);
// Perform channel equalization // Perform channel equalization

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