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310 lines
9.1 KiB
C
310 lines
9.1 KiB
C
/**
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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 <assert.h>
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#include <signal.h>
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#include "liblte/phy/phy.h"
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#include "iodev.h"
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#ifndef DISABLE_GRAPHICS
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void init_plots();
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void do_plots(ue_dl_t *q, uint32_t sf_idx);
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#endif
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int go_exit = 0;
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/* Local function definitions */
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void init_plots();
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/**********************************************************************
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* Program arguments processing
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***********************************************************************/
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typedef struct {
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uint16_t rnti;
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int nof_subframes;
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bool disable_plots;
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iodev_cfg_t io_config;
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}prog_args_t;
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void args_default(prog_args_t *args) {
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args->io_config.cell_id_file = 195;
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args->io_config.nof_prb_file = 50;
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args->io_config.nof_ports_file = 2;
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args->rnti = SIRNTI;
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args->nof_subframes = -1;
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args->disable_plots = false;
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args->io_config.find_threshold = -1.0;
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args->io_config.input_file_name = NULL;
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args->io_config.force_N_id_2 = -1; // Pick the best
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args->io_config.uhd_args = "";
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args->io_config.uhd_freq = -1.0;
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args->io_config.uhd_gain = 60.0;
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}
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void usage(prog_args_t *args, char *prog) {
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printf("Usage: %s [cargndvtbl] [-i input_file | -f rx_frequency (in Hz)]\n", prog);
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printf("\t-c cell_id if reading from file [Default %d]\n", args->io_config.cell_id_file);
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printf("\t-p nof_prb if reading from file [Default %d]\n", args->io_config.nof_prb_file);
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printf("\t-o nof_ports if reading from file [Default %d]\n", args->io_config.nof_ports_file);
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printf("\t-r RNTI to look for [Default 0x%x]\n", args->rnti);
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#ifndef DISABLE_UHD
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printf("\t-a UHD args [Default %s]\n", args->io_config.uhd_args);
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printf("\t-g UHD RX gain [Default %.2f dB]\n", args->io_config.uhd_gain);
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#else
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printf("\t UHD is disabled. CUHD library not available\n");
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#endif
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printf("\t-l Force N_id_2 [Default best]\n");
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printf("\t-b Decode PBCH only [Default All channels]\n");
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printf("\t-n nof_subframes [Default %d]\n", args->nof_subframes);
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printf("\t-t PSS threshold [Default %f]\n", args->io_config.find_threshold);
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#ifndef DISABLE_GRAPHICS
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printf("\t-d disable plots [Default enabled]\n");
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#else
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printf("\t plots are disabled. Graphics library not available\n");
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#endif
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printf("\t-v [set verbose to debug, default none]\n");
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}
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void parse_args(prog_args_t *args, int argc, char **argv) {
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int opt;
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args_default(args);
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while ((opt = getopt(argc, argv, "icagfndvtbprol")) != -1) {
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switch (opt) {
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case 'i':
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args->io_config.input_file_name = argv[optind];
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break;
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case 'c':
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args->io_config.cell_id_file = atoi(argv[optind]);
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break;
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case 'p':
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args->io_config.nof_prb_file = atoi(argv[optind]);
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break;
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case 'o':
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args->io_config.nof_ports_file = atoi(argv[optind]);
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break;
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case 'a':
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args->io_config.uhd_args = argv[optind];
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break;
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case 'g':
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args->io_config.uhd_gain = atof(argv[optind]);
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break;
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case 'f':
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args->io_config.uhd_freq = atof(argv[optind]);
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break;
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case 't':
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args->io_config.find_threshold = atof(argv[optind]);
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break;
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case 'n':
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args->nof_subframes = atoi(argv[optind]);
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break;
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case 'l':
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args->io_config.force_N_id_2 = atoi(argv[optind]);
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break;
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case 'r':
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args->rnti= atoi(argv[optind]);
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break;
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case 'd':
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args->disable_plots = true;
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break;
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case 'v':
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verbose++;
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break;
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default:
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usage(args, argv[0]);
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exit(-1);
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}
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}
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if (args->io_config.uhd_freq < 0 && args->io_config.input_file_name == NULL) {
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usage(args, argv[0]);
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exit(-1);
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}
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}
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/**********************************************************************/
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void sigintHandler(int x) {
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go_exit = 1;
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}
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/* TODO: Do something with the output data */
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uint8_t data[10000];
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extern float mean_exec_time;
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int main(int argc, char **argv) {
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int ret;
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cf_t *sf_buffer;
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iodev_t iodev;
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prog_args_t prog_args;
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lte_cell_t cell;
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ue_dl_t ue_dl;
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int64_t sf_cnt;
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pbch_mib_t mib;
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bool printed_sib = false;
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int rlen;
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parse_args(&prog_args, argc, argv);
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#ifndef DISABLE_GRAPHICS
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if (!prog_args.disable_plots) {
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init_plots();
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}
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#endif
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/* Initialize subframe counter */
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sf_cnt = 0;
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if (iodev_init(&iodev, &prog_args.io_config, &cell, &mib)) {
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exit(-1);
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}
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if (ue_dl_init(&ue_dl, cell, mib.phich_resources, mib.phich_length, 1234)) {
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fprintf(stderr, "Error initiating UE downlink processing module\n");
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exit(-1);
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}
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pdsch_set_rnti(&ue_dl.pdsch, prog_args.rnti);
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/* Main loop */
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while (!go_exit && (sf_cnt < prog_args.nof_subframes || prog_args.nof_subframes == -1)) {
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ret = iodev_receive(&iodev, &sf_buffer);
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if (ret < 0) {
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fprintf(stderr, "Error reading from input device (%d)\n", ret);
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break;
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}
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/* iodev_receive returns 1 if successfully read 1 aligned subframe */
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if (ret == 1) {
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rlen = ue_dl_decode(&ue_dl, sf_buffer, data, iodev_get_sfidx(&iodev), prog_args.rnti);
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if (rlen < 0) {
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fprintf(stderr, "\nError running receiver\n");fflush(stdout);
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exit(-1);
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}
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if (prog_args.rnti == SIRNTI && !printed_sib && rlen > 0) {
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printf("\n\nDecoded SIB1 Message: ");
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vec_fprint_hex(stdout, data, rlen);
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printf("\n");fflush(stdout);
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printed_sib = true;
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}
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// Plot and Printf
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if (!(sf_cnt % 10)) {
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printf("CFO: %+.4f KHz, SFO: %+.4f Khz, NOI: %.2f Errors: %4d/%4d/%4d, BLER: %.1e, Texec: %.2f\r",
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ue_sync_get_cfo(&iodev.sframe)/1000, ue_sync_get_sfo(&iodev.sframe)/1000,
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pdsch_average_noi(&ue_dl.pdsch),
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(int) ue_dl.pkt_errors, (int) ue_dl.pkts_total, (int) ue_dl.nof_trials,
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(float) ue_dl.pkt_errors / ue_dl.pkts_total,
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mean_exec_time);
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}
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#ifndef DISABLE_GRAPHICS
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if (!prog_args.disable_plots && iodev_get_sfidx(&iodev) == 5) {
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do_plots(&ue_dl, 5);
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}
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#endif
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} else if (ret == 0) {
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printf("Finding PSS... Peak: %8.1f, FrameCnt: %d, State: %d\r",
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sync_get_peak_value(&iodev.sframe.sfind),
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iodev.sframe.frame_total_cnt, iodev.sframe.state);
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}
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sf_cnt++;
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} // Main loop
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ue_dl_free(&ue_dl);
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iodev_free(&iodev);
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printf("\nBye\n");
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exit(0);
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}
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/**********************************************************************
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* Plotting Functions
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***********************************************************************/
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#ifndef DISABLE_GRAPHICS
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#include "liblte/graphics/plot.h"
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plot_real_t poutfft;
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plot_complex_t pce;
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plot_scatter_t pscatrecv, pscatequal;
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float tmp_plot[SLOT_LEN_RE(MAX_PRB, CPNORM)];
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void init_plots() {
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plot_init();
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plot_real_init(&poutfft);
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plot_real_setTitle(&poutfft, "Output FFT - Magnitude");
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plot_real_setLabels(&poutfft, "Index", "dB");
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plot_real_setYAxisScale(&poutfft, -30, 20);
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plot_complex_init(&pce);
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plot_complex_setTitle(&pce, "Channel Estimates");
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plot_complex_setYAxisScale(&pce, Ip, -3, 3);
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plot_complex_setYAxisScale(&pce, Q, -3, 3);
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plot_complex_setYAxisScale(&pce, Magnitude, 0, 4);
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plot_complex_setYAxisScale(&pce, Phase, -M_PI, M_PI);
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plot_scatter_init(&pscatrecv);
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plot_scatter_setTitle(&pscatrecv, "Received Symbols");
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plot_scatter_setXAxisScale(&pscatrecv, -4, 4);
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plot_scatter_setYAxisScale(&pscatrecv, -4, 4);
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plot_scatter_init(&pscatequal);
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plot_scatter_setTitle(&pscatequal, "Equalized Symbols");
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plot_scatter_setXAxisScale(&pscatequal, -2, 2);
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plot_scatter_setYAxisScale(&pscatequal, -2, 2);
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}
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void do_plots(ue_dl_t *q, uint32_t sf_idx) {
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int i;
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uint32_t nof_re = SLOT_LEN_RE(q->cell.nof_prb, q->cell.cp);
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uint32_t nof_symbols = q->harq_process[0].prb_alloc.re_sf[sf_idx];
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for (i = 0; i < nof_re; i++) {
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tmp_plot[i] = 10 * log10f(cabsf(q->sf_symbols[i]));
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if (isinf(tmp_plot[i])) {
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tmp_plot[i] = -80;
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}
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}
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plot_real_setNewData(&poutfft, tmp_plot, nof_re);
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plot_complex_setNewData(&pce, q->ce[0], nof_re);
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plot_scatter_setNewData(&pscatrecv, q->pdsch.pdsch_symbols[0], nof_symbols);
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plot_scatter_setNewData(&pscatequal, q->pdsch.pdsch_d, nof_symbols);
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}
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#endif
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