Merge pull request #7 from libLTE/master

Updating my fork from main repo
master
suttonpd 11 years ago
commit c4f149f6e3

@ -1,283 +0,0 @@
/**
*
* \section COPYRIGHT
*
* Copyright 2013-2014 The libLTE Developers. See the
* COPYRIGHT file at the top-level directory of this distribution.
*
* \section LICENSE
*
* This file is part of the libLTE library.
*
* libLTE is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version.
*
* libLTE is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* A copy of the GNU Lesser General Public License can be found in
* the LICENSE file in the top-level directory of this distribution
* and at http://www.gnu.org/licenses/.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <unistd.h>
#include "lte.h"
#ifndef DISABLE_UHD
#include "cuhd.h"
void *uhd;
#endif
char *output_file_name = NULL;
int nof_frames=-1;
int cell_id = 1;
int nof_prb = 6;
char *uhd_args = "";
float uhd_amp=0.25, uhd_gain=10.0, uhd_freq=2400000000;
filesink_t fsink;
lte_fft_t ifft;
pbch_t pbch;
cf_t *slot_buffer = NULL, *output_buffer = NULL;
int slot_n_re, slot_n_samples;
#define UHD_SAMP_FREQ 1920000
void usage(char *prog) {
printf("Usage: %s [agmfoncvp]\n", prog);
#ifndef DISABLE_UHD
printf("\t-a UHD args [Default %s]\n", uhd_args);
printf("\t-g UHD TX gain [Default %.2f dB]\n", uhd_gain);
printf("\t-m UHD signal amplitude [Default %.2f]\n", uhd_amp);
printf("\t-f UHD TX frequency [Default %.1f MHz]\n", uhd_freq/1000000);
#else
printf("\t UHD is disabled. CUHD library not available\n");
#endif
printf("\t-o output_file [Default USRP]\n");
printf("\t-n number of frames [Default %d]\n", nof_frames);
printf("\t-c cell id [Default %d]\n", cell_id);
printf("\t-p nof_prb [Default %d]\n", nof_prb);
printf("\t-v [set verbose to debug, default none]\n");
}
void parse_args(int argc, char **argv) {
int opt;
while ((opt = getopt(argc, argv, "agfmoncpv")) != -1) {
switch(opt) {
case 'a':
uhd_args = argv[optind];
break;
case 'g':
uhd_gain = atof(argv[optind]);
break;
case 'm':
uhd_amp = atof(argv[optind]);
break;
case 'f':
uhd_freq = atof(argv[optind]);
break;
case 'o':
output_file_name = argv[optind];
break;
case 'n':
nof_frames = atoi(argv[optind]);
break;
case 'p':
nof_prb = atoi(argv[optind]);
break;
case 'c':
cell_id = atoi(argv[optind]);
break;
case 'v':
verbose++;
break;
default:
usage(argv[0]);
exit(-1);
}
}
#ifdef DISABLE_UHD
if (!output_file_name) {
usage(argv[0]);
exit(-1);
}
#endif
}
void base_init() {
/* init memory */
slot_buffer = malloc(sizeof(cf_t) * slot_n_re);
if (!slot_buffer) {
perror("malloc");
exit(-1);
}
output_buffer = malloc(sizeof(cf_t) * slot_n_samples);
if (!output_buffer) {
perror("malloc");
exit(-1);
}
/* open file or USRP */
if (output_file_name) {
if (filesink_init(&fsink, output_file_name, COMPLEX_FLOAT_BIN)) {
fprintf(stderr, "Error opening file %s\n", output_file_name);
exit(-1);
}
} else {
#ifndef DISABLE_UHD
printf("Opening UHD device...\n");
if (cuhd_open(uhd_args,&uhd)) {
fprintf(stderr, "Error opening uhd\n");
exit(-1);
}
#else
printf("Error UHD not available. Select an output file\n");
exit(-1);
#endif
}
/* create ifft object */
if (lte_ifft_init(&ifft, CPNORM, nof_prb)) {
fprintf(stderr, "Error creating iFFT object\n");
exit(-1);
}
if (pbch_init(&pbch, 6, cell_id, CPNORM)) {
fprintf(stderr, "Error creating PBCH object\n");
exit(-1);
}
}
void base_free() {
pbch_free(&pbch);
lte_ifft_free(&ifft);
if (slot_buffer) {
free(slot_buffer);
}
if (output_buffer) {
free(output_buffer);
}
if (output_file_name) {
filesink_free(&fsink);
} else {
#ifndef DISABLE_UHD
cuhd_close(&uhd);
#endif
}
}
int main(int argc, char **argv) {
int nf, ns, N_id_2;
cf_t pss_signal[PSS_LEN];
float sss_signal0[SSS_LEN]; // for subframe 0
float sss_signal5[SSS_LEN]; // for subframe 5
pbch_mib_t mib;
refsignal_t refs[NSLOTS_X_FRAME];
int i;
cf_t *slot1_symbols[MAX_PORTS_CTRL];
#ifdef DISABLE_UHD
if (argc < 3) {
usage(argv[0]);
exit(-1);
}
#endif
parse_args(argc,argv);
N_id_2 = cell_id%3;
slot_n_re = CPNORM_NSYMB * nof_prb * RE_X_RB;
slot_n_samples = SLOT_LEN_CPNORM(lte_symbol_sz(nof_prb));
/* this *must* be called after setting slot_len_* */
base_init();
/* Generate PSS/SSS signals */
pss_generate(pss_signal, N_id_2);
sss_generate(sss_signal0, sss_signal5, cell_id);
/* Generate CRS signals */
for (i=0;i<NSLOTS_X_FRAME;i++) {
if (refsignal_init_LTEDL(&refs[i], 0, i, cell_id, CPNORM, nof_prb)) {
fprintf(stderr, "Error initiating CRS slot=%d\n", i);
return -1;
}
}
mib.nof_ports = 1;
mib.nof_prb = 6;
mib.phich_length = PHICH_NORM;
mib.phich_resources = R_1;
mib.sfn = 0;
for (i=0;i<MAX_PORTS_CTRL;i++) { // now there's only 1 port
slot1_symbols[i] = slot_buffer;
}
#ifndef DISABLE_UHD
if (!output_file_name) {
printf("Set TX rate: %.2f MHz\n", cuhd_set_tx_srate(uhd, UHD_SAMP_FREQ)/1000000);
printf("Set TX gain: %.1f dB\n", cuhd_set_tx_gain(uhd, uhd_gain));
printf("Set TX freq: %.2f MHz\n", cuhd_set_tx_freq(uhd, uhd_freq)/1000000);
}
#endif
nf = 0;
while(nf<nof_frames || nof_frames == -1) {
for (ns=0;ns<NSLOTS_X_FRAME;ns++) {
bzero(slot_buffer, sizeof(cf_t) * slot_n_re);
switch(ns) {
case 0: // tx pss/sss
case 10: // tx pss/sss
pss_put_slot(pss_signal, slot_buffer, nof_prb, CPNORM);
sss_put_slot(ns?sss_signal5:sss_signal0, slot_buffer, nof_prb, CPNORM);
break;
case 1: // tx pbch
pbch_encode(&pbch, &mib, slot1_symbols, 1);
break;
default: // transmit zeros
break;
}
refsignal_put(&refs[ns], slot_buffer);
/* Transform to OFDM symbols */
lte_ifft_run(&ifft, slot_buffer, output_buffer);
/* send to file or usrp */
if (output_file_name) {
filesink_write(&fsink, output_buffer, slot_n_samples);
usleep(5000);
} else {
#ifndef DISABLE_UHD
vec_sc_prod_cfc(output_buffer, uhd_amp, output_buffer, slot_n_samples);
cuhd_send(uhd, output_buffer, slot_n_samples, 1);
#endif
}
}
mib.sfn=(mib.sfn+1)%1024;
printf("SFN: %4d\r", mib.sfn);fflush(stdout);
nf++;
}
base_free();
printf("Done\n");
exit(0);
}
Loading…
Cancel
Save