mirror of https://github.com/pvnis/srsRAN_4G.git
Fixed some bugs in UE PDSCH example: equalization with zero channel estimates, cell search, synchronization. CRC-based early stopping
ismagom
11 years ago
parent
182c9958bb
commit
ce2abc06fe
@ -0,0 +1,157 @@
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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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#include "liblte/phy/phy.h"
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#ifndef DISABLE_UHD
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#include "liblte/cuhd/cuhd.h"
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int decode_pbch(void *uhd, cf_t *buffer, ue_celldetect_result_t *found_cell, uint32_t nof_frames_total, pbch_mib_t *mib)
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{
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ue_mib_t uemib;
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int n;
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bzero(mib, sizeof(pbch_mib_t));
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uint32_t nof_frames = 0;
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uint32_t flen = MIB_FRAME_SIZE;
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if (ue_mib_init(&uemib, found_cell->cell_id, found_cell->cp)) {
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fprintf(stderr, "Error initiating PBCH decoder\n");
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return LIBLTE_ERROR;
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}
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INFO("Setting sampling frequency 1.92 MHz for PBCH decoding\n", 0);
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cuhd_set_rx_srate(uhd, 1920000.0);
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INFO("Starting receiver...\n", 0);
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cuhd_start_rx_stream(uhd);
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do {
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if (cuhd_recv(uhd, buffer, flen, 1)<0) {
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fprintf(stderr, "Error receiving from USRP\n");
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return LIBLTE_ERROR;
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}
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INFO("Calling ue_mib_decode() %d/%d\n", nof_frames, nof_frames_total);
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n = ue_mib_decode(&uemib, buffer, flen, mib);
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if (n == LIBLTE_ERROR || n == LIBLTE_ERROR_INVALID_INPUTS) {
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fprintf(stderr, "Error calling ue_mib_decode()\n");
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return LIBLTE_ERROR;
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}
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if (n == MIB_FRAME_UNALIGNED) {
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printf("Realigning frame\n");
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if (cuhd_recv(uhd, buffer, flen/2, 1)<0) {
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fprintf(stderr, "Error receiving from USRP\n");
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return LIBLTE_ERROR;
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}
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}
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nof_frames++;
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} while (n != MIB_FOUND && nof_frames < 2*nof_frames_total);
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if (n == MIB_FOUND) {
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printf("\n\nMIB decoded in %d ms (%d half frames)\n", nof_frames*5, nof_frames);
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pbch_mib_fprint(stdout, mib, found_cell->cell_id);
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} else {
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printf("\nCould not decode MIB\n");
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}
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cuhd_stop_rx_stream(uhd);
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cuhd_flush_buffer(uhd);
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ue_mib_free(&uemib);
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return LIBLTE_SUCCESS;
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}
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int find_cell(void *uhd, ue_celldetect_t *s, cf_t *buffer, ue_celldetect_result_t found_cell[3])
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{
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int n;
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INFO("Setting sampling frequency 960 KHz for PSS search\n", 0);
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cuhd_set_rx_srate(uhd, 960000.0);
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INFO("Starting receiver...\n", 0);
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cuhd_start_rx_stream(uhd);
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uint32_t nof_scanned_cells = 0;
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uint32_t flen = 4800;
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int nof_detected_cells = 0;
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do {
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if (cuhd_recv(uhd, buffer, flen, 1)<0) {
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fprintf(stderr, "Error receiving from USRP\n");
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return LIBLTE_ERROR;
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}
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n = ue_celldetect_scan(s, buffer, flen, &found_cell[nof_scanned_cells]);
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switch(n) {
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case CS_FRAME_UNALIGNED:
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printf("Realigning frame\n");
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if (cuhd_recv(uhd, buffer, flen/2, 1)<0) {
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fprintf(stderr, "Error receiving from USRP\n");
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return LIBLTE_ERROR;
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}
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return LIBLTE_ERROR;
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case CS_CELL_DETECTED:
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nof_detected_cells++;
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if (found_cell[nof_scanned_cells].peak > 0) {
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printf("\n\tCELL ID: %d, CP: %s, Peak: %.2f, Mode: %d/%d\n",
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found_cell[nof_scanned_cells].cell_id,
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lte_cp_string(found_cell[nof_scanned_cells].cp),
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found_cell[nof_scanned_cells].peak, found_cell[nof_scanned_cells].mode,
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s->nof_frames_detected);
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}
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nof_scanned_cells++;
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break;
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case CS_CELL_NOT_DETECTED:
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nof_scanned_cells++;
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break;
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case LIBLTE_ERROR:
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case LIBLTE_ERROR_INVALID_INPUTS:
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fprintf(stderr, "Error calling cellsearch_scan()\n");
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return LIBLTE_ERROR;
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}
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} while(nof_scanned_cells < 3);
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INFO("Stopping receiver...\n", 0);
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cuhd_stop_rx_stream(uhd);
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cuhd_flush_buffer(uhd);
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return nof_detected_cells;
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}
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#endif
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@ -0,0 +1,40 @@
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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 "liblte/phy/phy.h"
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int decode_pbch(void *uhd,
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cf_t *buffer,
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ue_celldetect_result_t *found_cell,
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uint32_t nof_frames_total,
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pbch_mib_t *mib);
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int find_cell(void *uhd,
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ue_celldetect_t *s,
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cf_t *buffer,
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ue_celldetect_result_t found_cell[3]);
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