mirror of https://github.com/PentHertz/srsLTE.git
96 lines
3.0 KiB
C
96 lines
3.0 KiB
C
/*
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* Copyright (c) 2013, Ismael Gomez-Miguelez <gomezi@tcd.ie>.
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* This file is part of OSLD-lib (http://https://github.com/ismagom/osld-lib)
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*
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* OSLD-lib is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* OSLD-lib 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with OSLD-lib. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef CHEST_
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#define CHEST_
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#include <stdio.h>
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#include "ch_estimation/refsignal.h"
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#include "filter/filter2d.h"
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#include "lte/base.h"
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typedef _Complex float cf_t; /* this is only a shortcut */
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typedef enum {LINEAR} chest_interp_t;
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typedef void (*interpolate_fnc_t) (cf_t *input, cf_t *output, int M, int len, int off_st, int off_end);
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/** This is an OFDM channel estimator.
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* It works with any reference signal pattern, provided by the object
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* refsignal_t
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* A 2-D filter is used for freq and time channel interpolation.
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*
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*/
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/* Low-level API */
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typedef struct {
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int nof_ports;
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int nof_symbols;
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int nof_prb;
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lte_cp_t cp;
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refsignal_t refsignal[MAX_PORTS][NSLOTS_X_FRAME];
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interpolate_fnc_t interp;
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}chest_t;
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int chest_init(chest_t *q, chest_interp_t interp, lte_cp_t cp, int nof_prb, int nof_ports);
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void chest_free(chest_t *q);
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int chest_ref_LTEDL_slot_port(chest_t *q, int port, int nslot, int cell_id);
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int chest_ref_LTEDL_slot(chest_t *q, int nslot, int cell_id);
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int chest_ref_LTEDL(chest_t *q, int cell_id);
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void chest_ce_ref(chest_t *q, cf_t *input, int nslot, int port_id, int nref);
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void chest_ce_slot_port(chest_t *q, cf_t *input, cf_t *ce, int nslot, int port_id);
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void chest_ce_slot(chest_t *q, cf_t *input, cf_t **ce, int nslot);
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void chest_fprint(chest_t *q, FILE *stream, int nslot, int port_id);
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void chest_ref_fprint(chest_t *q, FILE *stream, int nslot, int port_id);
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void chest_recvsig_fprint(chest_t *q, FILE *stream, int nslot, int port_id);
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void chest_ce_fprint(chest_t *q, FILE *stream, int nslot, int port_id);
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int chest_ref_symbols(chest_t *q, int port_id, int nslot, int l[2]);
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/* High-level API */
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/** TODO: The high-level API has N interfaces, one for each port */
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typedef struct {
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chest_t obj;
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struct chest_init {
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int nof_symbols; // 7 for normal cp, 6 for extended
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int nof_ports;
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int nof_prb;
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int cell_id; // set to -1 to init at runtime
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} init;
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cf_t *input;
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int in_len;
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struct chest_ctrl_in {
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int slot_id; // slot id in the 10ms frame
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int cell_id;
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} ctrl_in;
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cf_t *output[MAX_PORTS];
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int out_len[MAX_PORTS];
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}chest_hl;
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#define DEFAULT_FRAME_SIZE 2048
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int chest_initialize(chest_hl* h);
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int chest_work(chest_hl* hl);
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int chest_stop(chest_hl* hl);
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#endif
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