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102 lines
4.3 KiB
C
102 lines
4.3 KiB
C
/**
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* Copyright 2013-2021 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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/**********************************************************************************************
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* File: refsignal_dl.h
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*
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* Description: Object to manage downlink reference signals for channel estimation.
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*
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* Reference: 3GPP TS 36.211 version 10.0.0 Release 10 Sec. 6.10
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*********************************************************************************************/
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#ifndef SRSLTE_REFSIGNAL_DL_H
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#define SRSLTE_REFSIGNAL_DL_H
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#include "srslte/config.h"
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#include "srslte/phy/common/phy_common.h"
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// Number of references in a subframe: there are 2 symbols for port_id=0,1 x 2 slots x 2 refs per prb
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#define SRSLTE_REFSIGNAL_NUM_SF_MBSFN(nof_prb, port_id) ((2 + 18) * (nof_prb))
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#define SRSLTE_REFSIGNAL_MAX_NUM_SF(nof_prb) (8 * nof_prb)
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#define SRSLTE_REFSIGNAL_MAX_NUM_SF_MBSFN(nof_prb) SRSLTE_REFSIGNAL_NUM_SF_MBSFN(nof_prb, 0)
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#define SRSLTE_REFSIGNAL_PILOT_IDX(i, l, cell) (2 * cell.nof_prb * (l) + (i))
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#define SRSLTE_REFSIGNAL_PILOT_IDX_MBSFN(i, l, cell) ((6 * cell.nof_prb * (l) + (i)))
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/** Cell-Specific Reference Signal */
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typedef struct SRSLTE_API {
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srslte_cell_t cell;
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cf_t* pilots[2][SRSLTE_NOF_SF_X_FRAME]; // Saves the reference signal per subframe for ports 0,1 and ports 2,3
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srslte_sf_t type;
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uint16_t mbsfn_area_id;
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} srslte_refsignal_t;
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SRSLTE_API int srslte_refsignal_cs_init(srslte_refsignal_t* q, uint32_t max_prb);
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SRSLTE_API int srslte_refsignal_cs_set_cell(srslte_refsignal_t* q, srslte_cell_t cell);
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SRSLTE_API void srslte_refsignal_free(srslte_refsignal_t* q);
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SRSLTE_API int
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srslte_refsignal_cs_put_sf(srslte_refsignal_t* q, srslte_dl_sf_cfg_t* sf, uint32_t port_id, cf_t* sf_symbols);
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SRSLTE_API int srslte_refsignal_cs_get_sf(srslte_refsignal_t* q,
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srslte_dl_sf_cfg_t* sf,
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uint32_t port_id,
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cf_t* sf_symbols,
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cf_t* pilots);
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SRSLTE_API uint32_t srslte_refsignal_cs_fidx(srslte_cell_t cell, uint32_t l, uint32_t port_id, uint32_t m);
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SRSLTE_API uint32_t srslte_refsignal_cs_nsymbol(uint32_t l, srslte_cp_t cp, uint32_t port_id);
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SRSLTE_API uint32_t srslte_refsignal_cs_v(uint32_t port_id, uint32_t ref_symbol_idx);
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SRSLTE_API uint32_t srslte_refsignal_cs_nof_symbols(srslte_refsignal_t* q, srslte_dl_sf_cfg_t* sf, uint32_t port_id);
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SRSLTE_API uint32_t srslte_refsignal_cs_nof_pilots_x_slot(uint32_t nof_ports);
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SRSLTE_API uint32_t srslte_refsignal_cs_nof_re(srslte_refsignal_t* q, srslte_dl_sf_cfg_t* sf, uint32_t port_id);
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SRSLTE_API int srslte_refsignal_mbsfn_init(srslte_refsignal_t* q, uint32_t max_prb);
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SRSLTE_API int srslte_refsignal_mbsfn_set_cell(srslte_refsignal_t* q, srslte_cell_t cell, uint16_t mbsfn_area_id);
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SRSLTE_API int srslte_refsignal_mbsfn_get_sf(srslte_cell_t cell, uint32_t port_id, cf_t* sf_symbols, cf_t* pilots);
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SRSLTE_API uint32_t srslte_refsignal_mbsfn_nsymbol(uint32_t l);
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SRSLTE_API uint32_t srslte_refsignal_mbsfn_fidx(uint32_t l);
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SRSLTE_API uint32_t srslte_refsignal_mbsfn_nof_symbols();
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SRSLTE_API int srslte_refsignal_mbsfn_put_sf(srslte_cell_t cell,
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uint32_t port_id,
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cf_t* cs_pilots,
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cf_t* mbsfn_pilots,
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cf_t* sf_symbols);
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SRSLTE_API int srslte_refsignal_mbsfn_gen_seq(srslte_refsignal_t* q, srslte_cell_t cell, uint32_t N_mbsfn_id);
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#endif // SRSLTE_REFSIGNAL_DL_H
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