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122 lines
3.9 KiB
C
122 lines
3.9 KiB
C
/*
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* Copyright 2013-2020 Software Radio Systems Limited
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*
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* This file is part of srsLTE.
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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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#ifndef SRSLTE_CHEST_SL_H
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#define SRSLTE_CHEST_SL_H
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#include <stdio.h>
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#include "srslte/phy/common/phy_common_sl.h"
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#include "srslte/phy/resampling/interp.h"
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#define SRSLTE_SL_N_RU_SEQ (30)
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#define SRSLTE_SL_MAX_DMRS_SYMB (4)
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#define SRSLTE_SL_DEFAULT_NOF_DMRS_CYCLIC_SHIFTS (1)
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#define SRSLTE_SL_MAX_PSCCH_NOF_DMRS_CYCLIC_SHIFTS (4)
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// Base Sequence Number - always 0 for sidelink: 3GPP TS 36.211 version 15.6.0 Release 15 Sec. 5.5.1.4
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#define SRSLTE_SL_BASE_SEQUENCE_NUMBER 0
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#define SRSLTE_SL_MAX_DMRS_PERIOD_LENGTH 320
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typedef struct SRSLTE_API {
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uint32_t prb_start_idx; // PRB start idx to map RE from RIV
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uint32_t nof_prb; // PSSCH nof_prb, Length of continuous PRB to map RE (in the pool) from RIV
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uint32_t N_x_id;
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uint32_t sf_idx; // PSSCH sf_idx
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uint32_t cyclic_shift;
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} srslte_chest_sl_cfg_t;
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typedef struct SRSLTE_API {
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srslte_sl_channels_t channel;
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srslte_cell_sl_t cell;
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srslte_sl_comm_resource_pool_t sl_comm_resource_pool;
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srslte_chest_sl_cfg_t chest_sl_cfg;
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uint32_t sf_n_re;
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uint32_t M_sc_rs;
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int8_t nof_dmrs_symbols;
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// Orthogonal Sequence (W) Transmission Mode 1, 2 and PSBCH
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int8_t w[SRSLTE_SL_MAX_DMRS_SYMB];
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// Cyclic Shift Values
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int8_t n_CS[SRSLTE_SL_MAX_DMRS_SYMB];
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// Reference Signal Cyclic Shift
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float alpha[SRSLTE_SL_MAX_DMRS_SYMB];
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// Group Hopping Flag
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uint32_t* f_gh_pattern;
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int32_t q[SRSLTE_SL_MAX_DMRS_SYMB];
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float* r[SRSLTE_SL_MAX_DMRS_SYMB];
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cf_t* r_uv[SRSLTE_SL_MAX_DMRS_SYMB];
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cf_t* r_sequence[SRSLTE_SL_MAX_DMRS_SYMB][SRSLTE_SL_MAX_PSCCH_NOF_DMRS_CYCLIC_SHIFTS];
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cf_t* r_sequence_rx[SRSLTE_SL_MAX_DMRS_SYMB];
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cf_t* ce;
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cf_t* ce_average;
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cf_t* noise_tmp;
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float noise_estimated;
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srslte_interp_linsrslte_vec_t lin_vec_sl;
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bool sync_error_enable;
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bool rsrp_enable;
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float sync_err;
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float rsrp_corr;
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} srslte_chest_sl_t;
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SRSLTE_API int srslte_chest_sl_init(srslte_chest_sl_t* q,
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srslte_sl_channels_t channel,
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srslte_cell_sl_t cell,
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srslte_sl_comm_resource_pool_t sl_comm_resource_pool);
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SRSLTE_API int srslte_chest_sl_set_cell(srslte_chest_sl_t* q, srslte_cell_sl_t cell);
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SRSLTE_API int srslte_chest_sl_set_cfg(srslte_chest_sl_t* q, srslte_chest_sl_cfg_t chest_sl_cfg);
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SRSLTE_API float srslte_chest_sl_get_sync_error(srslte_chest_sl_t* q);
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SRSLTE_API float srslte_chest_sl_estimate_noise(srslte_chest_sl_t* q);
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SRSLTE_API float srslte_chest_sl_get_rsrp(srslte_chest_sl_t* q);
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SRSLTE_API int srslte_chest_sl_put_dmrs(srslte_chest_sl_t* q, cf_t* sf_buffer);
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SRSLTE_API int srslte_chest_sl_get_dmrs(srslte_chest_sl_t* q, cf_t* sf_buffer, cf_t** dmrs_received);
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SRSLTE_API void srslte_chest_sl_ls_estimate(srslte_chest_sl_t* q, cf_t* sf_buffer);
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SRSLTE_API void srslte_chest_sl_ls_equalize(srslte_chest_sl_t* q, cf_t* sf_buffer, cf_t* equalized_sf_buffer);
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SRSLTE_API void srslte_chest_sl_ls_estimate_equalize(srslte_chest_sl_t* q, cf_t* sf_buffer, cf_t* equalized_sf_buffer);
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SRSLTE_API void srslte_chest_sl_free(srslte_chest_sl_t* q);
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#endif |