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334 lines
10 KiB
C
334 lines
10 KiB
C
/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2014 The srsLTE 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 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 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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* 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 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 "srslte/srslte.h"
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#include "srslte/cuhd/cuhd.h"
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#include "cuhd_utils.h"
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#define B210_DEFAULT_GAIN 40.0
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#define B210_DEFAULT_GAIN_CORREC 110.0 // Gain of the Rx chain when the gain is set to 40
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float gain_offset = B210_DEFAULT_GAIN_CORREC;
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cell_search_cfg_t cell_detect_config = {
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5000, // maximum number of frames to receive for MIB decoding
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50, // maximum number of frames to receive for PSS correlation
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16.0 // early-stops cell detection if mean PSR is above this value
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};
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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 = B210_DEFAULT_GAIN;
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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 srslte_verbose to debug, default none]\n");
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}
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int 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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srslte_verbose++;
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break;
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default:
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usage(args, argv[0]);
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return -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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return -1;
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}
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return 0;
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}
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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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int cuhd_recv_wrapper(void *h, void *data, uint32_t nsamples, srslte_timestamp_t *q) {
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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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enum receiver_state { DECODE_MIB, DECODE_SIB, MEASURE} state;
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#define MAX_SINFO 10
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#define MAX_NEIGHBOUR_CELLS 128
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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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srslte_cell_t cell;
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int64_t sf_cnt;
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srslte_ue_sync_t ue_sync;
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srslte_ue_mib_t ue_mib;
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void *uhd;
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srslte_ue_dl_t ue_dl;
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srslte_ofdm_t fft;
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srslte_chest_dl_t chest;
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uint32_t nframes=0;
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uint32_t nof_trials = 0;
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uint32_t sfn = 0; // system frame number
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int n;
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uint8_t bch_payload[BCH_PAYLOAD_LEN];
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uint32_t sfn_offset;
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float rssi_utra=0,rssi=0, rsrp=0, rsrq=0, snr=0;
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cf_t *ce[SRSLTE_MAX_PORTS];
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if (parse_args(&prog_args, argc, argv)) {
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exit(-1);
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}
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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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return -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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ret = cuhd_search_and_decode_mib(uhd, &cell_detect_config, prog_args.force_N_id_2, &cell);
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if (ret < 0) {
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fprintf(stderr, "Error searching cell\n");
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return -1;
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} else if (ret == 0) {
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printf("Cell not found\n");
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exit(0);
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}
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/* set sampling frequency */
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int srate = srslte_sampling_freq_hz(cell.nof_prb);
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if (srate != -1) {
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cuhd_set_rx_srate(uhd, (double) srate);
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} else {
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fprintf(stderr, "Invalid number of PRB %d\n", cell.nof_prb);
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return SRSLTE_ERROR;
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}
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INFO("Stopping UHD and flushing buffer...\n",0);
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cuhd_stop_rx_stream(uhd);
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cuhd_flush_buffer(uhd);
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if (srslte_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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return -1;
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}
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if (srslte_ue_dl_init(&ue_dl, cell)) {
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fprintf(stderr, "Error initiating UE downlink processing module\n");
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return -1;
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}
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if (srslte_ue_mib_init(&ue_mib, cell)) {
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fprintf(stderr, "Error initaiting UE MIB decoder\n");
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return -1;
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}
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/* Configure downlink receiver for the SI-RNTI since will be the only one we'll use */
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srslte_ue_dl_set_rnti(&ue_dl, SRSLTE_SIRNTI);
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/* Initialize subframe counter */
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sf_cnt = 0;
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if (srslte_ofdm_tx_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 (srslte_chest_dl_init(&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 = SRSLTE_SF_LEN_RE(cell.nof_prb, cell.cp);
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cf_t *sf_symbols = srslte_vec_malloc(sf_re * sizeof(cf_t));
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for (int i=0;i<SRSLTE_MAX_PORTS;i++) {
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ce[i] = srslte_vec_malloc(sizeof(cf_t) * sf_re);
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}
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cuhd_start_rx_stream(uhd);
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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 = srslte_ue_sync_get_buffer(&ue_sync, &sf_buffer);
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if (ret < 0) {
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fprintf(stderr, "Error calling srslte_ue_sync_work()\n");
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}
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/* srslte_ue_sync_get_buffer returns 1 if successfully read 1 aligned subframe */
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if (ret == 1) {
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switch (state) {
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case DECODE_MIB:
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if (srslte_ue_sync_get_sfidx(&ue_sync) == 0) {
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srslte_pbch_decode_reset(&ue_mib.pbch);
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n = srslte_ue_mib_decode(&ue_mib, sf_buffer, bch_payload, NULL, &sfn_offset);
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if (n < 0) {
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fprintf(stderr, "Error decoding UE MIB\n");
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return -1;
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} else if (n == SRSLTE_UE_MIB_FOUND) {
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srslte_pbch_mib_unpack(bch_payload, &cell, &sfn);
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printf("Decoded MIB. SFN: %d, offset: %d\n", sfn, sfn_offset);
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sfn = (sfn + sfn_offset)%1024;
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state = DECODE_SIB;
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}
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}
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break;
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case DECODE_SIB:
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/* We are looking for SI Blocks, search only in appropiate places */
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if ((srslte_ue_sync_get_sfidx(&ue_sync) == 5 && (sfn%2)==0)) {
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n = srslte_ue_dl_decode_rnti_rv(&ue_dl, sf_buffer, data, srslte_ue_sync_get_sfidx(&ue_sync), SRSLTE_SIRNTI,
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((int) ceilf((float)3*(((sfn)/2)%4)/2))%4);
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if (n < 0) {
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fprintf(stderr, "Error decoding UE DL\n");fflush(stdout);
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return -1;
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} else if (n == 0) {
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printf("CFO: %+6.4f KHz, SFO: %+6.4f Khz, NOI: %.2f, PDCCH-Det: %.3f\r",
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srslte_ue_sync_get_cfo(&ue_sync)/1000, srslte_ue_sync_get_sfo(&ue_sync)/1000,
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srslte_sch_average_noi(&ue_dl.pdsch.dl_sch),
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(float) ue_dl.nof_detected/nof_trials);
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nof_trials++;
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} else {
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printf("Decoded SIB1. Payload: ");
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srslte_vec_fprint_hex(stdout, data, n);;
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state = MEASURE;
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}
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}
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break;
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case MEASURE:
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if (srslte_ue_sync_get_sfidx(&ue_sync) == 5) {
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/* Run FFT for all subframe data */
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srslte_ofdm_tx_sf(&fft, sf_buffer, sf_symbols);
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srslte_chest_dl_estimate(&chest, sf_symbols, ce, srslte_ue_sync_get_sfidx(&ue_sync));
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rssi = SRSLTE_VEC_CMA(srslte_vec_avg_power_cf(sf_buffer,SRSLTE_SF_LEN(srslte_symbol_sz(cell.nof_prb))),rssi,nframes);
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rssi_utra = SRSLTE_VEC_CMA(srslte_chest_dl_get_rssi(&chest),rssi_utra,nframes);
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rsrq = SRSLTE_VEC_EMA(srslte_chest_dl_get_rsrq(&chest),rsrq,0.05);
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rsrp = SRSLTE_VEC_EMA(srslte_chest_dl_get_rsrp(&chest),rsrp,0.05);
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snr = SRSLTE_VEC_EMA(srslte_chest_dl_get_snr(&chest),snr,0.05);
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nframes++;
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}
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// Plot and Printf
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if ((nframes%10) == 0) {
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printf("CFO: %+8.4f KHz, SFO: %+8.4f Khz, RSSI: %5.1f dBm, RSSI/ref-symbol: %+5.1f dBm, "
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"RSRP: %+5.1f dBm, RSRQ: %5.1f dB, SNR: %5.1f dB\r",
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srslte_ue_sync_get_cfo(&ue_sync)/1000, srslte_ue_sync_get_sfo(&ue_sync)/1000,
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10*log10(rssi*1000)-gain_offset,
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10*log10(rssi_utra*1000)-gain_offset,
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10*log10(rsrp*1000)-gain_offset,
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10*log10(rsrq), 10*log10(snr));
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if (srslte_verbose != SRSLTE_VERBOSE_NONE) {
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printf("\n");
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}
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}
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break;
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}
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if (srslte_ue_sync_get_sfidx(&ue_sync) == 9) {
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sfn++;
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if (sfn == 1024) {
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sfn = 0;
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}
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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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srslte_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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srslte_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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