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128 lines
4.2 KiB
C
128 lines
4.2 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: phich.h
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*
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* Description: Physical Hybrid ARQ indicator channel.
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*
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* Reference: 3GPP TS 36.211 version 10.0.0 Release 10 Sec. 6.9
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*****************************************************************************/
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#ifndef SRSLTE_PHICH_H
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#define SRSLTE_PHICH_H
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#include "regs.h"
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#include "srslte/config.h"
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#include "srslte/phy/ch_estimation/chest_dl.h"
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#include "srslte/phy/common/phy_common.h"
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#include "srslte/phy/mimo/layermap.h"
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#include "srslte/phy/mimo/precoding.h"
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#include "srslte/phy/modem/demod_soft.h"
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#include "srslte/phy/modem/mod.h"
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#include "srslte/phy/scrambling/scrambling.h"
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#define SRSLTE_PHICH_NORM_NSEQUENCES 8
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#define SRSLTE_PHICH_EXT_NSEQUENCES 4
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#define SRSLTE_PHICH_NBITS 3
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#define SRSLTE_PHICH_NORM_MSYMB SRSLTE_PHICH_NBITS * 4
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#define SRSLTE_PHICH_EXT_MSYMB SRSLTE_PHICH_NBITS * 2
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#define SRSLTE_PHICH_MAX_NSYMB SRSLTE_PHICH_NORM_MSYMB
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#define SRSLTE_PHICH_NORM_C 1
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#define SRSLTE_PHICH_EXT_C 2
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#define SRSLTE_PHICH_NORM_NSF 4
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#define SRSLTE_PHICH_EXT_NSF 2
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/* phich object */
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typedef struct SRSLTE_API {
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srslte_cell_t cell;
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uint32_t nof_rx_antennas;
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/* handler to REGs resource mapper */
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srslte_regs_t* regs;
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/* buffers */
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cf_t ce[SRSLTE_MAX_PORTS][SRSLTE_MAX_PORTS][SRSLTE_PHICH_MAX_NSYMB];
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cf_t sf_symbols[SRSLTE_MAX_PORTS][SRSLTE_PHICH_MAX_NSYMB];
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cf_t x[SRSLTE_MAX_PORTS][SRSLTE_PHICH_MAX_NSYMB];
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cf_t d[SRSLTE_PHICH_MAX_NSYMB];
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cf_t d0[SRSLTE_PHICH_MAX_NSYMB];
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cf_t z[SRSLTE_PHICH_NBITS];
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/* bit message */
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uint8_t data[SRSLTE_PHICH_NBITS];
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float data_rx[SRSLTE_PHICH_NBITS];
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/* tx & rx objects */
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srslte_modem_table_t mod;
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srslte_sequence_t seq[SRSLTE_NOF_SF_X_FRAME];
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} srslte_phich_t;
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typedef struct SRSLTE_API {
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uint32_t ngroup;
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uint32_t nseq;
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} srslte_phich_resource_t;
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typedef struct SRSLTE_API {
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uint32_t n_prb_lowest;
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uint32_t n_dmrs;
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uint32_t I_phich;
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} srslte_phich_grant_t;
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typedef struct SRSLTE_API {
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bool ack_value;
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float distance;
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} srslte_phich_res_t;
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SRSLTE_API int srslte_phich_init(srslte_phich_t* q, uint32_t nof_rx_antennas);
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SRSLTE_API void srslte_phich_free(srslte_phich_t* q);
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SRSLTE_API int srslte_phich_set_cell(srslte_phich_t* q, srslte_regs_t* regs, srslte_cell_t cell);
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SRSLTE_API void srslte_phich_set_regs(srslte_phich_t* q, srslte_regs_t* regs);
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SRSLTE_API void srslte_phich_calc(srslte_phich_t* q, srslte_phich_grant_t* grant, srslte_phich_resource_t* n_phich);
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SRSLTE_API int srslte_phich_decode(srslte_phich_t* q,
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srslte_dl_sf_cfg_t* sf,
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srslte_chest_dl_res_t* channel,
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srslte_phich_resource_t n_phich,
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cf_t* sf_symbols[SRSLTE_MAX_PORTS],
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srslte_phich_res_t* result);
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SRSLTE_API int srslte_phich_encode(srslte_phich_t* q,
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srslte_dl_sf_cfg_t* sf,
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srslte_phich_resource_t n_phich,
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uint8_t ack,
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cf_t* sf_symbols[SRSLTE_MAX_PORTS]);
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SRSLTE_API void srslte_phich_reset(srslte_phich_t* q, cf_t* slot_symbols[SRSLTE_MAX_PORTS]);
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SRSLTE_API uint32_t srslte_phich_ngroups(srslte_phich_t* q);
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SRSLTE_API uint32_t srslte_phich_nsf(srslte_phich_t* q);
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#endif // SRSLTE_PHICH_H
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