srsLTE/srslte/lib/enb/enb_ul.c

209 lines
6.1 KiB
C

/**
*
* \section COPYRIGHT
*
* Copyright 2013-2015 Software Radio Systems Limited
*
* \section LICENSE
*
* This file is part of the srsLTE library.
*
* srsLTE is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version.
*
* srsLTE is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* A copy of the GNU Affero General Public License can be found in
* the LICENSE file in the top-level directory of this distribution
* and at http://www.gnu.org/licenses/.
*
*/
#include "srslte/enb/enb_ul.h"
#include <complex.h>
#include <math.h>
#include <string.h>
#define CURRENT_FFTSIZE srslte_symbol_sz(q->cell.nof_prb)
#define CURRENT_SFLEN SRSLTE_SF_LEN(CURRENT_FFTSIZE)
#define CURRENT_SLOTLEN_RE SRSLTE_SLOT_LEN_RE(q->cell.nof_prb, q->cell.cp)
#define CURRENT_SFLEN_RE SRSLTE_SF_LEN_RE(q->cell.nof_prb, q->cell.cp)
#define MAX_CANDIDATES 64
int srslte_enb_ul_init(srslte_enb_ul_t *q, srslte_cell_t cell,
srslte_prach_cfg_t *prach_cfg,
srslte_refsignal_dmrs_pusch_cfg_t *pusch_cfg,
srslte_pucch_cfg_t *pucch_cfg,
uint32_t nof_rnti)
{
int ret = SRSLTE_ERROR_INVALID_INPUTS;
if (q != NULL &&
srslte_cell_isvalid(&cell))
{
ret = SRSLTE_ERROR;
bzero(q, sizeof(srslte_enb_ul_t));
q->cell = cell;
q->nof_rnti = nof_rnti;
if (srslte_ofdm_rx_init(&q->fft, q->cell.cp, q->cell.nof_prb)) {
fprintf(stderr, "Error initiating FFT\n");
goto clean_exit;
}
srslte_ofdm_set_normalize(&q->fft, true);
srslte_ofdm_set_freq_shift(&q->fft, -0.5);
if (srslte_pucch_init(&q->pucch, q->cell)) {
fprintf(stderr, "Error creating PUCCH object\n");
goto clean_exit;
}
if (srslte_pusch_init(&q->pusch, q->cell)) {
fprintf(stderr, "Error creating PUSCH object\n");
goto clean_exit;
}
if (srslte_pusch_init_rnti_multi(&q->pusch, nof_rnti)) {
fprintf(stderr, "Error initiating multiple RNTIs in PUSCH\n");
goto clean_exit;
}
if (srslte_prach_init_cfg(&q->prach, prach_cfg, q->cell.nof_prb)) {
fprintf(stderr, "Error initiating PRACH\n");
goto clean_exit;
}
srslte_prach_set_detect_factor(&q->prach, 60);
if (srslte_chest_ul_init(&q->chest, cell)) {
fprintf(stderr, "Error initiating channel estimator\n");
goto clean_exit;
}
// SRS is a dedicated configuration
srslte_chest_ul_set_cfg(&q->chest, pusch_cfg, pucch_cfg, NULL);
q->sf_symbols = srslte_vec_malloc(CURRENT_SFLEN_RE * sizeof(cf_t));
if (!q->sf_symbols) {
perror("malloc");
goto clean_exit;
}
q->ce = srslte_vec_malloc(CURRENT_SFLEN_RE * sizeof(cf_t));
if (!q->ce) {
perror("malloc");
goto clean_exit;
}
ret = SRSLTE_SUCCESS;
} else {
fprintf(stderr, "Invalid cell properties: Id=%d, Ports=%d, PRBs=%d\n",
cell.id, cell.nof_ports, cell.nof_prb);
}
clean_exit:
if (ret == SRSLTE_ERROR) {
srslte_enb_ul_free(q);
}
return ret;
}
void srslte_enb_ul_free(srslte_enb_ul_t *q)
{
if (q) {
srslte_prach_free(&q->prach);
srslte_ofdm_rx_free(&q->fft);
srslte_pucch_free(&q->pucch);
srslte_pusch_free(&q->pusch);
srslte_chest_ul_free(&q->chest);
if (q->sf_symbols) {
free(q->sf_symbols);
}
if (q->ce) {
free(q->ce);
}
bzero(q, sizeof(srslte_enb_ul_t));
}
}
int srslte_enb_ul_cfg_rnti(srslte_enb_ul_t *q, uint32_t idx, uint16_t rnti)
{
return srslte_pusch_set_rnti_multi(&q->pusch, idx, rnti);
}
int srslte_enb_ul_rem_rnti(srslte_enb_ul_t *q, uint32_t idx)
{
return srslte_pusch_set_rnti_multi(&q->pusch, idx, 0);
}
void srslte_enb_ul_fft(srslte_enb_ul_t *q, cf_t *signal_buffer)
{
srslte_ofdm_rx_sf(&q->fft, signal_buffer, q->sf_symbols);
}
int srslte_enb_ul_get_pusch(srslte_enb_ul_t *q, srslte_ra_ul_grant_t *grant, srslte_softbuffer_rx_t *softbuffer,
uint32_t rnti_idx, uint32_t rv_idx, uint32_t current_tx_nb,
uint8_t *data, srslte_uci_data_t *uci_data, uint32_t tti)
{
if (srslte_pusch_cfg(&q->pusch, &q->pusch_cfg, grant, NULL, NULL, NULL, tti, rv_idx, current_tx_nb)) {
fprintf(stderr, "Error configuring PDSCH\n");
return SRSLTE_ERROR;
}
uint32_t cyclic_shift_for_dmrs = 0;
srslte_chest_ul_estimate(&q->chest, q->sf_symbols, q->ce, grant->L_prb, tti%10, cyclic_shift_for_dmrs, grant->n_prb);
float noise_power = srslte_chest_ul_get_noise_estimate(&q->chest);
return srslte_pusch_uci_decode_rnti_idx(&q->pusch, &q->pusch_cfg,
softbuffer, q->sf_symbols,
q->ce, noise_power,
rnti_idx, data,
uci_data);
}
int srslte_enb_ul_detect_prach(srslte_enb_ul_t *q, uint32_t tti,
uint32_t freq_offset, cf_t *signal,
uint32_t *indices, float *offsets, float *peak2avg)
{
uint32_t nof_detected_prach = 0;
// consider the number of subframes the transmission must be anticipated
if (srslte_prach_tti_opportunity(&q->prach, tti, -1))
{
if (srslte_prach_detect_offset(&q->prach,
freq_offset,
&signal[q->prach.N_cp],
SRSLTE_SF_LEN_PRB(q->cell.nof_prb),
indices,
offsets,
peak2avg,
&nof_detected_prach))
{
fprintf(stderr, "Error detecting PRACH\n");
return SRSLTE_ERROR;
}
}
return (int) nof_detected_prach;
}