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130 lines
3.8 KiB
C
130 lines
3.8 KiB
C
/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2015 Software Radio Systems Limited
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*
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* \section LICENSE
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*
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* This file is part of the srsLTE library.
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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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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#include <strings.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include <assert.h>
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#include <math.h>
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#include "srslte/common/phy_common.h"
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#include "srslte/utils/debug.h"
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#include "srslte/utils/vector.h"
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#include "srslte/dft/dft.h"
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#include "srslte/dft/dft_precoding.h"
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/* Create DFT plans for transform precoding */
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int srslte_dft_precoding_init(srslte_dft_precoding_t *q, uint32_t max_prb)
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{
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int ret = SRSLTE_ERROR_INVALID_INPUTS;
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bzero(q, sizeof(srslte_dft_precoding_t));
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if (max_prb <= SRSLTE_MAX_PRB) {
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ret = SRSLTE_ERROR;
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for (uint32_t i=1;i<=max_prb;i++) {
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if(srslte_dft_precoding_valid_prb(i)) {
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DEBUG("Initiating DFT precoding plan for %d PRBs\n", i);
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if (srslte_dft_plan_c(&q->dft_plan[i], i*SRSLTE_NRE, SRSLTE_DFT_FORWARD)) {
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fprintf(stderr, "Error: Creating DFT plan %d\n",i);
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goto clean_exit;
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}
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srslte_dft_plan_set_norm(&q->dft_plan[i], true);
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if (srslte_dft_plan_c(&q->idft_plan[i], i*SRSLTE_NRE, SRSLTE_DFT_BACKWARD)) {
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fprintf(stderr, "Error: Creating DFT plan %d\n",i);
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goto clean_exit;
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}
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srslte_dft_plan_set_norm(&q->idft_plan[i], true);
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}
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}
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q->max_prb = max_prb;
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ret = SRSLTE_SUCCESS;
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}
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clean_exit:
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if (ret == SRSLTE_ERROR) {
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srslte_dft_precoding_free(q);
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}
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return ret;
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}
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/* Free DFT plans for transform precoding */
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void srslte_dft_precoding_free(srslte_dft_precoding_t *q)
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{
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for (uint32_t i=1;i<=q->max_prb;i++) {
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if(srslte_dft_precoding_valid_prb(i)) {
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DEBUG("Freeing DFT precoding plan for %d PRBs\n", i);
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srslte_dft_plan_free(&q->dft_plan[i]);
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srslte_dft_plan_free(&q->idft_plan[i]);
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}
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}
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bzero(q, sizeof(srslte_dft_precoding_t));
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}
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bool srslte_dft_precoding_valid_prb(uint32_t nof_prb) {
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if (nof_prb > 0 &&
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(nof_prb == 1 || (nof_prb%2) == 0 || (nof_prb%3) == 0 || (nof_prb%5) == 0))
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{
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return true;
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} else {
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return false;
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}
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}
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int srslte_dft_precoding(srslte_dft_precoding_t *q, cf_t *input, cf_t *output,
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uint32_t nof_prb, uint32_t nof_symbols)
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{
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if (!srslte_dft_precoding_valid_prb(nof_prb) && nof_prb <= q->max_prb) {
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fprintf(stderr, "Error invalid number of PRB (%d)\n", nof_prb);
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return SRSLTE_ERROR;
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}
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for (uint32_t i=0;i<nof_symbols;i++) {
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srslte_dft_run_c(&q->dft_plan[nof_prb], &input[i*SRSLTE_NRE*nof_prb], &output[i*SRSLTE_NRE*nof_prb]);
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}
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return SRSLTE_SUCCESS;
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}
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int srslte_dft_predecoding(srslte_dft_precoding_t *q, cf_t *input, cf_t *output,
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uint32_t nof_prb, uint32_t nof_symbols)
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{
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if (!srslte_dft_precoding_valid_prb(nof_prb) && nof_prb <= q->max_prb) {
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fprintf(stderr, "Error invalid number of PRB (%d)\n", nof_prb);
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return SRSLTE_ERROR;
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}
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for (uint32_t i=0;i<nof_symbols;i++) {
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srslte_dft_run_c(&q->dft_plan[nof_prb], &input[i*SRSLTE_NRE*nof_prb], &output[i*SRSLTE_NRE*nof_prb]);
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}
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return SRSLTE_SUCCESS;
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}
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