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117 lines
3.0 KiB
C
117 lines
3.0 KiB
C
11 years ago
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/*
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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 SSS_
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#define SSS_
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#include <stdint.h>
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#include <stdbool.h>
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#include "utils/dft.h"
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typedef _Complex float cf_t; /* this is only a shortcut */
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/** gives the beginning of the SSS symbol (to be passed to sss_synch_m0m1).
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* subframe_sz is the length of the subframe, e.g. 1920 for the 1.9 MHz
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* symbol_sz is the OFDM symbol size (including CP), e.g. 137 for the 1.9 MHz
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*/
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#define SSS_SYMBOL_ST(subframe_sz, symbol_sz) (subframe_sz/2-2*symbol_sz)
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#define SSS_POS_SYMBOL 33
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#define SSS_DFT_LEN 128
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#define N_SSS 31
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struct sss_tables {
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int z1[N_SSS][N_SSS];
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int c[2][N_SSS];
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int s[N_SSS][N_SSS];
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int N_id_2;
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};
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/* Allocate 32 complex to make it multiple of 32-byte AVX instructions alignment requirement.
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* Should use vect_malloc() to make it platform agnostic.
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*/
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struct fc_tables {
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cf_t z1[N_SSS+1][N_SSS+1];
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cf_t c[2][N_SSS+1];
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cf_t s[N_SSS+1][N_SSS+1];
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};
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/* Low-level API */
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typedef struct {
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dft_plan_t dftp_input;
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float corr_peak_threshold;
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int symbol_sz;
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int subframe_sz;
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int N_id_1_table[30][30];
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struct fc_tables fc_tables;
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}sss_synch_t;
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/* Basic functionality */
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int sss_synch_init(sss_synch_t *q);
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void sss_synch_free(sss_synch_t *q);
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void sss_generate(float *signal, int cell_id);
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int sss_synch_set_N_id_2(sss_synch_t *q, int N_id_2);
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void sss_synch_m0m1(sss_synch_t *q, cf_t *input, int *m0, float *m0_value,
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int *m1, float *m1_value);
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int sss_synch_subframe(int m0, int m1);
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int sss_synch_N_id_1(sss_synch_t *q, int m0, int m1);
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int sss_synch_frame(sss_synch_t *q, cf_t *input, int *subframe_idx, int *N_id_1);
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void sss_synch_set_threshold(sss_synch_t *q, float threshold);
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void sss_synch_set_symbol_sz(sss_synch_t *q, int symbol_sz);
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void sss_synch_set_subframe_sz(sss_synch_t *q, int subframe_sz);
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/* High-level API */
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typedef struct {
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sss_synch_t obj;
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struct sss_synch_init {
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int N_id_2;
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} init;
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cf_t *input;
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int in_len;
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struct sss_synch_ctrl_in {
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int symbol_sz;
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int subframe_sz;
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int correlation_threshold;
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} ctrl_in;
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struct sss_synch_ctrl_out {
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int subframe_idx;
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int N_id_1;
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} ctrl_out;
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}sss_synch_hl;
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#define DEFAULT_FRAME_SIZE 2048
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int sss_synch_initialize(sss_synch_hl* h);
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int sss_synch_work(sss_synch_hl* hl);
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int sss_synch_stop(sss_synch_hl* hl);
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#endif
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