2014-12-11 15:04:21 -08:00
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/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2014 The libLTE Developers. See the
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* COPYRIGHT file at the top-level directory of this distribution.
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*
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* \section LICENSE
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*
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* This file is part of the libLTE library.
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*
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* libLTE 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
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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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* libLTE 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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* A copy of the GNU Lesser 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 <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <strings.h>
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#include <unistd.h>
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#include <math.h>
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#include <sys/time.h>
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#include <unistd.h>
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2015-03-18 05:16:28 -07:00
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#include "srslte/phy/phy.h"
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#include "srslte/rrc/rrc.h"
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2014-12-11 15:04:21 -08:00
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#include "cuhd_utils.h"
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#ifndef DISABLE_UHD
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2015-03-18 05:16:28 -07:00
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#include "srslte/cuhd/cuhd.h"
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2014-12-11 15:04:21 -08:00
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2015-02-24 02:19:42 -08:00
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int cuhd_recv_wrapper_cs(void *h, void *data, uint32_t nsamples, timestamp_t *t) {
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2014-12-11 15:04:21 -08:00
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DEBUG(" ---- Receive %d samples ---- \n", nsamples);
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return cuhd_recv(h, data, nsamples, 1);
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}
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/** This function is simply a wrapper to the ue_cell_search module for cuhd devices
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* Return 1 if the MIB is decoded, 0 if not or -1 on error.
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*/
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int cuhd_mib_decoder(void *uhd, uint32_t max_nof_frames, lte_cell_t *cell) {
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int ret = LIBLTE_ERROR;
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ue_mib_sync_t ue_mib;
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uint8_t bch_payload[BCH_PAYLOAD_LEN], bch_payload_unpacked[BCH_PAYLOAD_LEN];
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if (ue_mib_sync_init(&ue_mib, cell->id, cell->cp, cuhd_recv_wrapper_cs, uhd)) {
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fprintf(stderr, "Error initiating ue_mib_sync\n");
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goto clean_exit;
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}
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int srate = lte_sampling_freq_hz(MIB_NOF_PRB);
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INFO("Setting sampling frequency %.2f MHz for PSS search\n", (float) srate/1000000);
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cuhd_set_rx_srate(uhd, (float) srate);
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INFO("Starting receiver...\n", 0);
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cuhd_start_rx_stream(uhd);
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/* Find and decody MIB */
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ret = ue_mib_sync_decode(&ue_mib, max_nof_frames, bch_payload, &cell->nof_ports, NULL);
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if (ret < 0) {
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fprintf(stderr, "Error decoding MIB\n");
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goto clean_exit;
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}
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if (ret == 1) {
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bit_unpack_vector(bch_payload, bch_payload_unpacked, BCH_PAYLOAD_LEN);
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bcch_bch_unpack(bch_payload_unpacked, BCH_PAYLOAD_LEN, cell, NULL);
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}
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clean_exit:
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cuhd_stop_rx_stream(uhd);
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ue_mib_sync_free(&ue_mib);
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return ret;
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}
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/** This function is simply a wrapper to the ue_cell_search module for cuhd devices
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*/
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int cuhd_cell_search(void *uhd, cell_search_cfg_t *config,
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int force_N_id_2, lte_cell_t *cell)
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{
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int ret = LIBLTE_ERROR;
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ue_cell_search_t cs;
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ue_cell_search_result_t found_cells[3];
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bzero(found_cells, 3*sizeof(ue_cell_search_result_t));
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if (ue_cell_search_init(&cs, cuhd_recv_wrapper_cs, uhd)) {
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fprintf(stderr, "Error initiating UE cell detect\n");
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return LIBLTE_ERROR;
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}
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2014-12-15 05:43:54 -08:00
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if (config->max_frames_pss) {
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ue_cell_search_set_nof_frames_to_scan(&cs, config->max_frames_pss);
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2014-12-11 15:04:21 -08:00
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}
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if (config->threshold) {
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ue_cell_search_set_threshold(&cs, config->threshold);
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}
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INFO("Setting sampling frequency %.2f MHz for PSS search\n", CS_SAMP_FREQ/1000000);
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cuhd_set_rx_srate(uhd, CS_SAMP_FREQ);
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INFO("Starting receiver...\n", 0);
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cuhd_start_rx_stream(uhd);
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/* Find a cell in the given N_id_2 or go through the 3 of them to find the strongest */
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uint32_t max_peak_cell = 0;
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if (force_N_id_2 >= 0) {
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ret = ue_cell_search_scan_N_id_2(&cs, force_N_id_2, &found_cells[force_N_id_2]);
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max_peak_cell = force_N_id_2;
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} else {
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ret = ue_cell_search_scan(&cs, found_cells, &max_peak_cell);
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}
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if (ret < 0) {
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fprintf(stderr, "Error searching cell\n");
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return LIBLTE_ERROR;
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} else if (ret == 0) {
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fprintf(stderr, "Could not find any cell in this frequency\n");
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return LIBLTE_SUCCESS;
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}
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// Save result
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if (cell) {
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cell->id = found_cells[max_peak_cell].cell_id;
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cell->cp = found_cells[max_peak_cell].cp;
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}
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cuhd_stop_rx_stream(uhd);
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ue_cell_search_free(&cs);
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return ret;
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}
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/* Finds a cell and decodes MIB from the PBCH.
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* Returns 1 if the cell is found and MIB is decoded successfully.
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* 0 if no cell was found or MIB could not be decoded,
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* -1 on error
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*/
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int cuhd_search_and_decode_mib(void *uhd, cell_search_cfg_t *config, int force_N_id_2, lte_cell_t *cell)
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{
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int ret = LIBLTE_ERROR;
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printf("Searching for cell...\n");
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ret = cuhd_cell_search(uhd, config, force_N_id_2, cell);
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if (ret > 0) {
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printf("Decoding PBCH for cell %d (N_id_2=%d)\n", cell->id, cell->id%3);
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2014-12-15 05:43:54 -08:00
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ret = cuhd_mib_decoder(uhd, config->max_frames_pbch, cell);
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2014-12-11 15:04:21 -08:00
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if (ret < 0) {
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fprintf(stderr, "Could not decode PBCH from CELL ID %d\n", cell->id);
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return LIBLTE_ERROR;
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}
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}
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return ret;
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}
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#endif
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