mirror of https://github.com/PentHertz/srsLTE.git
Added cell measurement example
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ismagom
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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 <assert.h>
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#include <signal.h>
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#include "liblte/phy/phy.h"
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#include "liblte/cuhd/cuhd.h"
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#include "cell_search_utils.h"
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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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int nof_subframes;
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bool disable_plots;
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int force_N_id_2;
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char *uhd_args;
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float uhd_freq;
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float uhd_gain;
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}prog_args_t;
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void args_default(prog_args_t *args) {
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args->nof_subframes = -1;
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args->force_N_id_2 = -1; // Pick the best
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args->uhd_args = "";
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args->uhd_freq = -1.0;
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args->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 [aglnv] -f rx_frequency (in Hz)\n", prog);
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printf("\t-a UHD args [Default %s]\n", args->uhd_args);
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printf("\t-g UHD RX gain [Default %.2f dB]\n", args->uhd_gain);
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printf("\t-l Force N_id_2 [Default best]\n");
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printf("\t-n nof_subframes [Default %d]\n", args->nof_subframes);
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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, "aglnvf")) != -1) {
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switch (opt) {
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case 'a':
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args->uhd_args = argv[optind];
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break;
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case 'g':
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args->uhd_gain = atof(argv[optind]);
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break;
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case 'f':
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args->uhd_freq = 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->force_N_id_2 = atoi(argv[optind]);
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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->uhd_freq < 0) {
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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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/* TODO: Do something with the output data */
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char data[10000];
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int cuhd_recv_wrapper(void *h, void *data, uint32_t nsamples) {
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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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int main(int argc, char **argv) {
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int ret;
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cf_t *sf_buffer;
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prog_args_t prog_args;
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lte_cell_t cell;
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int64_t sf_cnt;
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pbch_mib_t mib;
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ue_sync_t ue_sync;
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void *uhd;
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parse_args(&prog_args, argc, argv);
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printf("Opening UHD device...\n");
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if (cuhd_open(prog_args.uhd_args, &uhd)) {
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fprintf(stderr, "Error opening uhd\n");
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exit(-1);
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}
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/* Set receiver gain */
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cuhd_set_rx_gain(uhd, prog_args.uhd_gain);
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/* set receiver frequency */
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cuhd_set_rx_freq(uhd, (double) prog_args.uhd_freq);
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cuhd_rx_wait_lo_locked(uhd);
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printf("Tunning receiver to %.3f MHz\n", (double ) prog_args.uhd_freq/1000000);
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if (cell_search(uhd, prog_args.force_N_id_2, &cell, &mib)) {
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fprintf(stderr, "Cell not found\n");
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exit(-1);
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}
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cuhd_start_rx_stream(uhd);
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if (ue_sync_init(&ue_sync, cell, cuhd_recv_wrapper, uhd)) {
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fprintf(stderr, "Error initiating ue_sync\n");
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exit(-1);
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}
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/* Initialize subframe counter */
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sf_cnt = 0;
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lte_fft_t fft;
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chest_t chest;
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if (lte_fft_init(&fft, cell.cp, cell.nof_prb)) {
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fprintf(stderr, "Error initiating FFT\n");
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return -1;
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}
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if (chest_init_LTEDL(&chest, cell)) {
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fprintf(stderr, "Error initiating channel estimator\n");
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return -1;
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}
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int sf_re = SF_LEN_RE(cell.nof_prb, cell.cp);
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cf_t *sf_symbols = vec_malloc(sf_re * sizeof(cf_t));
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unsigned int nframes=0;
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/* Main loop */
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while (sf_cnt < prog_args.nof_subframes || prog_args.nof_subframes == -1) {
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ret = ue_sync_get_buffer(&ue_sync, &sf_buffer);
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if (ret < 0) {
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fprintf(stderr, "Error calling ue_sync_work()\n");
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}
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float rssi=0, rsrp=0, rsrq=0;
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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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/* Run FFT for all subframe data */
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lte_fft_run_sf(&fft, sf_buffer, sf_symbols);
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chest_measure_sf(&chest, sf_symbols, ue_sync_get_sfidx(&ue_sync));
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rssi = VEC_CMA(chest_rssi_sf(&chest, sf_symbols),rssi,nframes);
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rsrq = VEC_CMA(chest_rsrq_sf(&chest, sf_symbols, ue_sync_get_sfidx(&ue_sync)),rsrq,nframes);
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rsrp = VEC_CMA(chest_rsrp_sf(&chest, ue_sync_get_sfidx(&ue_sync)),rsrp,nframes);
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nframes++;
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// Plot and Printf
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if ((nframes%10) == 0) {
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printf("CFO: %+6.4f KHz, SFO: %+6.4f Khz, RSSI: %+5.2f dBm, RSRP: %+4.2f dBm, RSRQ: %4.2f dB\r",
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ue_sync_get_cfo(&ue_sync)/1000, ue_sync_get_sfo(&ue_sync)/1000,
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10*log10(rssi*1000/4/cell.nof_prb/12/2)-prog_args.uhd_gain,
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10*log10(rsrp*1000)-prog_args.uhd_gain,
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10*log10(rsrq));
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}
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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(&ue_sync.sfind),
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ue_sync.frame_total_cnt, ue_sync.state);
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}
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sf_cnt++;
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} // Main loop
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ue_sync_free(&ue_sync);
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cuhd_close(uhd);
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printf("\nBye\n");
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exit(0);
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}
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