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srsRAN_4G/lte/examples/pdsch_ue.c

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/**
*
* \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 <math.h>
#include <sys/time.h>
#include <unistd.h>
#include <assert.h>
#include <signal.h>
#include <pthread.h>
#include <semaphore.h>
#include "liblte/rrc/rrc.h"
#include "liblte/phy/phy.h"
#ifndef DISABLE_UHD
#include "liblte/cuhd/cuhd.h"
#include "cuhd_utils.h"
cell_search_cfg_t cell_detect_config = {
5000,
100, // nof_frames_total
16.0 // threshold
};
#endif
//#define STDOUT_COMPACT
#ifndef DISABLE_GRAPHICS
#include "liblte/graphics/plot.h"
void init_plots();
pthread_t plot_thread;
sem_t plot_sem;
uint32_t plot_sf_idx=0;
#endif
#define B210_DEFAULT_GAIN 40.0
#define B210_DEFAULT_GAIN_CORREC 110.0 // Gain of the Rx chain when the gain is set to 40
float gain_offset = B210_DEFAULT_GAIN_CORREC;
/**********************************************************************
* Program arguments processing
***********************************************************************/
typedef struct {
int nof_subframes;
bool disable_plots;
int force_N_id_2;
uint16_t rnti;
char *input_file_name;
uint32_t file_nof_prb;
char *uhd_args;
float uhd_freq;
float uhd_gain;
int net_port;
char *net_address;
int net_port_signal;
char *net_address_signal;
}prog_args_t;
void args_default(prog_args_t *args) {
args->nof_subframes = -1;
args->rnti = SIRNTI;
args->force_N_id_2 = -1; // Pick the best
args->input_file_name = NULL;
args->file_nof_prb = 6;
args->uhd_args = "";
args->uhd_freq = -1.0;
args->uhd_gain = 60.0;
args->net_port = -1;
args->net_address = "127.0.0.1";
args->net_port_signal = -1;
args->net_address_signal = "127.0.0.1";
}
void usage(prog_args_t *args, char *prog) {
printf("Usage: %s [agildnruv] -f rx_frequency (in Hz) | -i input_file\n", prog);
#ifndef DISABLE_UHD
printf("\t-a UHD args [Default %s]\n", args->uhd_args);
printf("\t-g UHD RX gain [Default %.2f dB]\n", args->uhd_gain);
#else
printf("\t UHD is disabled. CUHD library not available\n");
#endif
printf("\t-i input_file [Default USRP]\n");
printf("\t-p nof_prb for input file [Default %d]\n", args->file_nof_prb);
printf("\t-r RNTI [Default 0x%x]\n",args->rnti);
printf("\t-l Force N_id_2 [Default best]\n");
#ifndef DISABLE_GRAPHICS
printf("\t-d disable plots [Default enabled]\n");
#else
printf("\t plots are disabled. Graphics library not available\n");
#endif
printf("\t-n nof_subframes [Default %d]\n", args->nof_subframes);
printf("\t-s remote UDP port to send input signal (-1 does nothing with it) [Default %d]\n", args->net_port_signal);
printf("\t-S remote UDP address to send input signal [Default %s]\n", args->net_address_signal);
printf("\t-u remote TCP port to send data (-1 does nothing with it) [Default %d]\n", args->net_port);
printf("\t-U remote TCP address to send data [Default %s]\n", args->net_address);
printf("\t-v [set verbose to debug, default none]\n");
}
void parse_args(prog_args_t *args, int argc, char **argv) {
int opt;
args_default(args);
while ((opt = getopt(argc, argv, "aglipdnvrfuUsS")) != -1) {
switch (opt) {
case 'i':
args->input_file_name = argv[optind];
break;
case 'p':
args->file_nof_prb = atoi(argv[optind]);
break;
case 'a':
args->uhd_args = argv[optind];
break;
case 'g':
args->uhd_gain = atof(argv[optind]);
break;
case 'f':
args->uhd_freq = atof(argv[optind]);
break;
case 'n':
args->nof_subframes = atoi(argv[optind]);
break;
case 'r':
args->rnti = atoi(argv[optind]);
break;
case 'l':
args->force_N_id_2 = atoi(argv[optind]);
break;
case 'u':
args->net_port = atoi(argv[optind]);
break;
case 'U':
args->net_address = argv[optind];
break;
case 's':
args->net_port_signal = atoi(argv[optind]);
break;
case 'S':
args->net_address_signal = argv[optind];
break;
case 'd':
args->disable_plots = true;
break;
case 'v':
verbose++;
break;
default:
usage(args, argv[0]);
exit(-1);
}
}
if (args->uhd_freq < 0 && args->input_file_name == NULL) {
usage(args, argv[0]);
exit(-1);
}
}
/**********************************************************************/
/* TODO: Do something with the output data */
uint8_t data[20000], data_packed[20000];
bool go_exit = false;
void sig_int_handler(int signo)
{
if (signo == SIGINT) {
go_exit = true;
}
}
#ifndef DISABLE_UHD
int cuhd_recv_wrapper(void *h, void *data, uint32_t nsamples, timestamp_t *t) {
DEBUG(" ---- Receive %d samples ---- \n", nsamples);
return cuhd_recv(h, data, nsamples, 1);
}
#endif
extern float mean_exec_time;
enum receiver_state { DECODE_MIB, DECODE_PDSCH} state;
ue_dl_t ue_dl;
ue_sync_t ue_sync;
prog_args_t prog_args;
uint32_t sfn = 0; // system frame number
cf_t *sf_buffer = NULL;
netsink_t net_sink, net_sink_signal;
int main(int argc, char **argv) {
int ret;
lte_cell_t cell;
int64_t sf_cnt;
ue_mib_t ue_mib;
#ifndef DISABLE_UHD
void *uhd;
#endif
uint32_t nof_trials = 0;
int n;
uint8_t bch_payload[BCH_PAYLOAD_LEN], bch_payload_unpacked[BCH_PAYLOAD_LEN];
uint32_t sfn_offset;
parse_args(&prog_args, argc, argv);
if (prog_args.net_port > 0) {
if (netsink_init(&net_sink, prog_args.net_address, prog_args.net_port, NETSINK_TCP)) {
fprintf(stderr, "Error initiating UDP socket to %s:%d\n", prog_args.net_address, prog_args.net_port);
exit(-1);
}
netsink_set_nonblocking(&net_sink);
}
if (prog_args.net_port_signal > 0) {
if (netsink_init(&net_sink_signal, prog_args.net_address_signal, prog_args.net_port_signal, NETSINK_UDP)) {
fprintf(stderr, "Error initiating UDP socket to %s:%d\n", prog_args.net_address_signal, prog_args.net_port_signal);
exit(-1);
}
netsink_set_nonblocking(&net_sink_signal);
}
#ifndef DISABLE_UHD
if (!prog_args.input_file_name) {
printf("Opening UHD device...\n");
if (cuhd_open(prog_args.uhd_args, &uhd)) {
fprintf(stderr, "Error opening uhd\n");
exit(-1);
}
/* Set receiver gain */
cuhd_set_rx_gain(uhd, prog_args.uhd_gain);
/* set receiver frequency */
cuhd_set_rx_freq(uhd, (double) prog_args.uhd_freq);
cuhd_rx_wait_lo_locked(uhd);
printf("Tunning receiver to %.3f MHz\n", (double ) prog_args.uhd_freq/1000000);
ret = cuhd_search_and_decode_mib(uhd, &cell_detect_config, prog_args.force_N_id_2, &cell);
if (ret < 0) {
fprintf(stderr, "Error searching for cell\n");
exit(-1);
} else if (ret == 0) {
printf("Cell not found\n");
exit(0);
}
/* set sampling frequency */
int srate = lte_sampling_freq_hz(cell.nof_prb);
if (srate != -1) {
cuhd_set_rx_srate(uhd, (double) srate);
} else {
fprintf(stderr, "Invalid number of PRB %d\n", cell.nof_prb);
return LIBLTE_ERROR;
}
INFO("Stopping UHD and flushing buffer...\r",0);
cuhd_stop_rx_stream(uhd);
cuhd_flush_buffer(uhd);
if (ue_mib_init(&ue_mib, cell)) {
fprintf(stderr, "Error initaiting UE MIB decoder\n");
exit(-1);
}
}
#endif
/* If reading from file, go straight to PDSCH decoding. Otherwise, decode MIB first */
if (prog_args.input_file_name) {
state = DECODE_PDSCH;
/* preset cell configuration */
cell.id = 1;
cell.cp = CPNORM;
cell.phich_length = PHICH_NORM;
cell.phich_resources = R_1;
cell.nof_ports = 1;
cell.nof_prb = prog_args.file_nof_prb;
if (ue_sync_init_file(&ue_sync, prog_args.file_nof_prb, prog_args.input_file_name)) {
fprintf(stderr, "Error initiating ue_sync\n");
exit(-1);
}
} else {
#ifndef DISABLE_UHD
state = DECODE_MIB;
if (ue_sync_init(&ue_sync, cell, cuhd_recv_wrapper, uhd)) {
fprintf(stderr, "Error initiating ue_sync\n");
exit(-1);
}
#endif
}
if (ue_dl_init(&ue_dl, cell)) { // This is the User RNTI
fprintf(stderr, "Error initiating UE downlink processing module\n");
exit(-1);
}
ue_dl_set_user_rnti(&ue_dl, prog_args.rnti==SIRNTI?1:prog_args.rnti);
/* Configure downlink receiver for the SI-RNTI since will be the only one we'll use */
ue_dl_set_rnti(&ue_dl, prog_args.rnti);
/* Initialize subframe counter */
sf_cnt = 0;
// Register Ctrl+C handler
signal(SIGINT, sig_int_handler);
#ifndef DISABLE_GRAPHICS
if (!prog_args.disable_plots) {
init_plots(cell);
}
#endif
#ifndef DISABLE_UHD
if (!prog_args.input_file_name) {
cuhd_start_rx_stream(uhd);
}
#endif
// Variables for measurements
uint32_t nframes=0;
float rsrp=0.0, rsrq=0.0, snr=0.0;
bool decode_pdsch;
int pdcch_tx=0;
/* Main loop */
while (!go_exit && (sf_cnt < prog_args.nof_subframes || prog_args.nof_subframes == -1)) {
ret = ue_sync_get_buffer(&ue_sync, &sf_buffer);
if (ret < 0) {
fprintf(stderr, "Error calling ue_sync_work()\n");
}
/* ue_sync_get_buffer returns 1 if successfully read 1 aligned subframe */
if (ret == 1) {
switch (state) {
case DECODE_MIB:
if (ue_sync_get_sfidx(&ue_sync) == 0) {
pbch_decode_reset(&ue_mib.pbch);
n = ue_mib_decode(&ue_mib, sf_buffer, bch_payload_unpacked, NULL, &sfn_offset);
if (n < 0) {
fprintf(stderr, "Error decoding UE MIB\n");
exit(-1);
} else if (n == MIB_FOUND) {
bit_unpack_vector(bch_payload_unpacked, bch_payload, BCH_PAYLOAD_LEN);
bcch_bch_unpack(bch_payload, BCH_PAYLOAD_LEN, &cell, &sfn);
printf("Decoded MIB. SFN: %d, offset: %d\n", sfn, sfn_offset);
sfn = (sfn + sfn_offset)%1024;
state = DECODE_PDSCH;
}
}
break;
case DECODE_PDSCH:
if (prog_args.rnti != SIRNTI) {
decode_pdsch = true;
} else {
/* We are looking for SIB1 Blocks, search only in appropiate places */
if ((ue_sync_get_sfidx(&ue_sync) == 5 && (sfn%2)==0)) {
decode_pdsch = true;
} else {
decode_pdsch = false;
}
}
if (decode_pdsch) {
if (prog_args.rnti != SIRNTI) {
n = ue_dl_decode(&ue_dl, sf_buffer, data_packed, ue_sync_get_sfidx(&ue_sync));
} else {
n = ue_dl_decode_sib(&ue_dl, sf_buffer, data_packed, ue_sync_get_sfidx(&ue_sync),
((int) ceilf((float)3*(((sfn)/2)%4)/2))%4);
}
if (n < 0) {
// fprintf(stderr, "Error decoding UE DL\n");fflush(stdout);
} else if (n > 0) {
/* Send data if socket active */
if (prog_args.net_port > 0) {
bit_unpack_vector(data_packed, data, n);
netsink_write(&net_sink, data, 1+(n-1)/8);
}
}
nof_trials++;
rsrq = VEC_EMA(chest_dl_get_rsrq(&ue_dl.chest), rsrq, 0.05);
rsrp = VEC_EMA(chest_dl_get_rsrp(&ue_dl.chest), rsrp, 0.05);
snr = VEC_EMA(chest_dl_get_snr(&ue_dl.chest), snr, 0.01);
nframes++;
if (isnan(rsrq)) {
rsrq = 0;
}
if (isnan(snr)) {
snr = 0;
}
if (isnan(rsrp)) {
rsrp = 0;
}
#ifdef adjust_estimator
/* Adjust channel estimator based on SNR */
if (10*log10(snr) < 5.0) {
float f_low_snr[5]={0.05, 0.15, 0.6, 0.15, 0.05};
chest_dl_set_filter_freq(&ue_dl.chest, f_low_snr, 5);
} else if (10*log10(snr) < 10.0) {
float f_mid_snr[3]={0.1, 0.8, 0.1};
chest_dl_set_filter_freq(&ue_dl.chest, f_mid_snr, 3);
} else {
float f_high_snr[3]={0.05, 0.9, 0.05};
chest_dl_set_filter_freq(&ue_dl.chest, f_high_snr, 3);
}
#endif
}
if (ue_sync_get_sfidx(&ue_sync) != 5 && ue_sync_get_sfidx(&ue_sync) != 0) {
pdcch_tx++;
}
// Plot and Printf
if (ue_sync_get_sfidx(&ue_sync) == 5) {
#ifdef STDOUT_COMPACT
printf("SFN: %4d, PDCCH-Miss: %5.2f%% (%d missed), PDSCH-BLER: %5.2f%% (%d errors)\r",
sfn, 100*(1-(float) ue_dl.nof_pdcch_detected/nof_trials),pdcch_tx-ue_dl.nof_pdcch_detected,
(float) 100*ue_dl.pkt_errors/ue_dl.pkts_total,ue_dl.pkt_errors);
#else
printf("CFO: %+6.2f KHz, SFO: %+6.2f Khz, "
"RSRP: %+5.1f dBm, RSRQ: %5.1f dB, SNR: %4.1f dB, "
"PDCCH-Miss: %5.2f%% (%d), PDSCH-BLER: %5.2f%% (%d)\r",
ue_sync_get_cfo(&ue_sync)/1000, ue_sync_get_sfo(&ue_sync)/1000,
10*log10(rsrp*1000)-gain_offset,
10*log10(rsrq), 10*log10(snr),
100*(1-(float) ue_dl.nof_pdcch_detected/nof_trials), pdcch_tx-ue_dl.nof_pdcch_detected,
(float) 100*ue_dl.pkt_errors/ue_dl.pkts_total, ue_dl.pkt_errors);
#endif
}
break;
}
if (ue_sync_get_sfidx(&ue_sync) == 9) {
sfn++;
if (sfn == 1024) {
sfn = 0;
}
}
#ifndef DISABLE_GRAPHICS
if (!prog_args.disable_plots) {
plot_sf_idx = ue_sync_get_sfidx(&ue_sync);
sem_post(&plot_sem);
}
#endif
} else if (ret == 0) {
printf("Finding PSS... Peak: %8.1f, FrameCnt: %d, State: %d\r",
sync_get_peak_value(&ue_sync.sfind),
ue_sync.frame_total_cnt, ue_sync.state);
}
sf_cnt++;
} // Main loop
ue_dl_free(&ue_dl);
ue_sync_free(&ue_sync);
#ifndef DISABLE_UHD
if (!prog_args.input_file_name) {
ue_mib_free(&ue_mib);
cuhd_close(uhd);
}
#endif
printf("\nBye\n");
exit(0);
}
/**********************************************************************
* Plotting Functions
***********************************************************************/
#ifndef DISABLE_GRAPHICS
//plot_waterfall_t poutfft;
plot_real_t p_sync, pce;
plot_scatter_t pscatequal, pscatequal_pdcch;
float tmp_plot[SLOT_LEN_RE(MAX_PRB, CPNORM)];
float tmp_plot2[SLOT_LEN_RE(MAX_PRB, CPNORM)];
float tmp_plot3[SLOT_LEN_RE(MAX_PRB, CPNORM)];
void *plot_thread_run(void *arg) {
int i;
uint32_t nof_re = SF_LEN_RE(ue_dl.cell.nof_prb, ue_dl.cell.cp);
while(1) {
sem_wait(&plot_sem);
uint32_t nof_symbols = ue_dl.harq_process[0].dl_alloc.re_sf[plot_sf_idx];
for (i = 0; i < nof_re; i++) {
tmp_plot[i] = 20 * log10f(cabsf(ue_dl.sf_symbols[i]));
if (isinf(tmp_plot[i])) {
tmp_plot[i] = -80;
}
}
for (i = 0; i < REFSIGNAL_NUM_SF(ue_dl.cell.nof_prb,0); i++) {
tmp_plot2[i] = 20 * log10f(cabsf(ue_dl.chest.pilot_estimates_average[0][i]));
if (isinf(tmp_plot2[i])) {
tmp_plot2[i] = -80;
}
}
//for (i=0;i<CP_NSYMB(ue_dl.cell.cp);i++) {
// plot_waterfall_appendNewData(&poutfft, &tmp_plot[i*RE_X_RB*ue_dl.cell.nof_prb], RE_X_RB*ue_dl.cell.nof_prb);
//}
plot_real_setNewData(&pce, tmp_plot2, REFSIGNAL_NUM_SF(ue_dl.cell.nof_prb,0));
if (!prog_args.input_file_name) {
int max = vec_max_fi(ue_sync.strack.pss.conv_output_avg, ue_sync.strack.pss.frame_size+ue_sync.strack.pss.fft_size-1);
vec_sc_prod_fff(ue_sync.strack.pss.conv_output_avg,
1/ue_sync.strack.pss.conv_output_avg[max],
tmp_plot2,
ue_sync.strack.pss.frame_size+ue_sync.strack.pss.fft_size-1);
plot_real_setNewData(&p_sync, tmp_plot2, ue_sync.strack.pss.frame_size);
}
plot_scatter_setNewData(&pscatequal, ue_dl.pdsch.pdsch_d, nof_symbols);
plot_scatter_setNewData(&pscatequal_pdcch, ue_dl.pdcch.pdcch_d, 36*ue_dl.pdcch.nof_cce);
if (plot_sf_idx == 1) {
if (prog_args.net_port_signal > 0) {
netsink_write(&net_sink_signal, &sf_buffer[ue_sync_sf_len(&ue_sync)/7],
ue_sync_sf_len(&ue_sync));
}
}
}
return NULL;
}
void init_plots() {
plot_init();
//plot_waterfall_init(&poutfft, RE_X_RB * ue_dl.cell.nof_prb, 1000);
//plot_waterfall_setTitle(&poutfft, "Output FFT - Magnitude");
//plot_waterfall_setPlotYAxisScale(&poutfft, -40, 40);
plot_real_init(&pce);
plot_real_setTitle(&pce, "Channel Response - Magnitude");
plot_real_setLabels(&pce, "Index", "dB");
plot_real_setYAxisScale(&pce, -40, 40);
plot_real_init(&p_sync);
plot_real_setTitle(&p_sync, "PSS Cross-Corr abs value");
plot_real_setYAxisScale(&p_sync, 0, 1);
plot_scatter_init(&pscatequal);
plot_scatter_setTitle(&pscatequal, "PDSCH - Equalized Symbols");
plot_scatter_setXAxisScale(&pscatequal, -4, 4);
plot_scatter_setYAxisScale(&pscatequal, -4, 4);
plot_scatter_init(&pscatequal_pdcch);
plot_scatter_setTitle(&pscatequal_pdcch, "PDCCH - Equalized Symbols");
plot_scatter_setXAxisScale(&pscatequal_pdcch, -4, 4);
plot_scatter_setYAxisScale(&pscatequal_pdcch, -4, 4);
if (sem_init(&plot_sem, 0, 0)) {
perror("sem_init");
exit(-1);
}
if (pthread_create(&plot_thread, NULL, plot_thread_run, NULL)) {
perror("pthread_create");
exit(-1);
}
}
#endif
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