mirror of https://github.com/pvnis/srsRAN_4G.git
Improved PCFICH detection using soft bit correlation.
ismagom
10 years ago
parent
10ce33d47d
commit
5e6abc7186
@ -1,28 +0,0 @@
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#
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# Copyright 2012-2013 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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# 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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# CELL SCANNER TEST
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#################################################################
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add_executable(cell_scanner_test cell_scanner_test.c cell_scanner.c ../cuhd_utils.c)
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target_link_libraries(cell_scanner_test lte_phy lte_rrc cuhd)
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@ -1,283 +0,0 @@
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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/rrc/rrc.h"
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#include "liblte/phy/phy.h"
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#include "liblte/cuhd/cuhd.h"
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#include "../cuhd_utils.h"
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#include "cell_scanner.h"
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#define B210_DEFAULT_GAIN 40.0
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#define B210_DEFAULT_GAIN_CORREC 80.0 // Gain of the Rx chain when the gain is set to 40
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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 cell_scanner_init(cell_scanner_t *q, cell_scanner_config_t *config)
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{
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bzero(q, sizeof(cell_scanner_t));
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memcpy(&q->config, config, sizeof(cell_scanner_config_t));
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printf("Opening UHD device...\n");
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if (cuhd_open(q->config.uhd_args, &q->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(q->uhd, B210_DEFAULT_GAIN);
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return 0;
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}
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void cell_scanner_close(cell_scanner_t *q) {
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cuhd_close(q->uhd);
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}
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int cell_scanner_all_cells(cell_scanner_t *q, float frequency, cell_scanner_result_t *result)
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{
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return cell_scanner_cell(q, frequency, -1, result);
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}
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#define MAX_SINFO 10
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int cell_scanner_cell(cell_scanner_t *q, float frequency, int N_id_2, cell_scanner_result_t *result)
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{
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int ret;
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cf_t *sf_buffer;
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lte_cell_t cell;
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int64_t sf_cnt;
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ue_sync_t ue_sync;
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ue_mib_t ue_mib;
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ue_dl_t ue_dl;
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lte_fft_t fft;
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chest_dl_t chest;
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uint32_t nframes_measure=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], bch_payload_unpacked[BCH_PAYLOAD_LEN];
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uint32_t sfn_offset;
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uint8_t data[1024];
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uint8_t data_unpacked[1024];
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bzero(result, sizeof(cell_scanner_result_t));
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/* set receiver frequency */
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cuhd_set_rx_freq(q->uhd, (double) frequency);
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cuhd_rx_wait_lo_locked(q->uhd);
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printf("Tunning receiver to %.3f MHz\n", (double ) frequency/1000000);
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cell_search_cfg_t cfg;
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cfg.max_frames_pss = q->config.pss_max_frames;
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cfg.max_frames_pbch = q->config.pbch_max_frames;
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cfg.threshold = q->config.cell_detect_early_stop_threshold;
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ret = cuhd_search_and_decode_mib(q->uhd, &cfg, 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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exit(-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 = lte_sampling_freq_hz(cell.nof_prb);
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if (srate != -1) {
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cuhd_set_rx_srate(q->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 LIBLTE_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(q->uhd);
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cuhd_flush_buffer(q->uhd);
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if (ue_sync_init(&ue_sync, cell, cuhd_recv_wrapper, q->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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if (ue_dl_init(&ue_dl, cell, 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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if (ue_mib_init(&ue_mib, cell)) {
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fprintf(stderr, "Error initaiting UE MIB decoder\n");
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exit(-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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ue_dl_set_rnti(&ue_dl, SIRNTI);
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/* Initialize subframe counter */
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sf_cnt = 0;
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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_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 = 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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cf_t *ce[MAX_PORTS];
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for (int i=0;i<MAX_PORTS;i++) {
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ce[i] = vec_malloc(sizeof(cf_t) * sf_re);
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}
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cuhd_start_rx_stream(q->uhd);
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memcpy(&result->phy_cell, &cell, sizeof(lte_cell_t));
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chest_dl_t *chest_ptr = &ue_dl.chest;
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bool mib_decoded = false;
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bool sib_decoded = false;
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/* Main loop */
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while (sf_cnt < q->config.measure_avg_nof_frames) {
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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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/* ue_sync_get_buffer returns 1 if successfully read 1 aligned subframe */
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if (ret == 1) {
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if (!mib_decoded) {
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if (ue_sync_get_sfidx(&ue_sync) == 0) {
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pbch_decode_reset(&ue_mib.pbch);
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n = ue_mib_decode(&ue_mib, sf_buffer, bch_payload_unpacked, 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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exit(-1);
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} else if (n == MIB_FOUND) {
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bit_unpack_vector(bch_payload_unpacked, bch_payload, BCH_PAYLOAD_LEN);
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bcch_bch_unpack(bch_payload, BCH_PAYLOAD_LEN, &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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mib_decoded = true;
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}
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}
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}
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/* We are looking for SI Blocks, search only in appropiate places */
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if (mib_decoded && !sib_decoded &&
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(ue_sync_get_sfidx(&ue_sync) == 5 && (sfn%2)==0))
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{
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n = ue_dl_decode_sib(&ue_dl, sf_buffer, data, ue_sync_get_sfidx(&ue_sync),
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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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exit(-1);
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} else if (n == 0) {
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nof_trials++;
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} else {
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bit_unpack_vector(data, data_unpacked, n);
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void *dlsch_msg = bcch_dlsch_unpack(data_unpacked, n);
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if (dlsch_msg) {
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printf("\n");fflush(stdout);
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cell_access_info_t cell_info;
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bcch_dlsch_sib1_get_cell_access_info(dlsch_msg, &cell_info);
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printf("Decoded SIB1. Cell ID: 0x%x\n", cell_info.cell_id);
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result->cell_id = cell_info.cell_id;
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bcch_dlsch_fprint(dlsch_msg, stdout);
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sib_decoded = true;
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}
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}
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} else {
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chest_ptr = &chest;
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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_dl_estimate(&chest, sf_symbols, ce, ue_sync_get_sfidx(&ue_sync));
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}
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result->rssi = VEC_CMA(vec_avg_power_cf(sf_buffer,SF_LEN(lte_symbol_sz(cell.nof_prb))),
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result->rssi,nframes_measure);
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result->rsrq = VEC_EMA(chest_dl_get_rsrq(chest_ptr),result->rsrq,0.01);
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result->rsrp = VEC_CMA(chest_dl_get_rsrp(chest_ptr),result->rsrp,nframes_measure);
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result->snr = VEC_EMA(chest_dl_get_snr(chest_ptr),result->snr,0.01);
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nframes_measure++;
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// Plot and Printf
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if ((nframes_measure%10) == 0) {
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printf("CFO: %+8.4f KHz, SFO: %+8.4f Khz, RSSI: %5.1f dBm, "
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"RSRP: %+5.1f dBm, RSRQ: %5.1f dB, SNR: %5.1f 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(result->rssi*1000)-B210_DEFAULT_GAIN_CORREC,
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10*log10(result->rsrp*1000)-B210_DEFAULT_GAIN_CORREC,
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10*log10(result->rsrq), 10*log10(result->snr));
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if (verbose != VERBOSE_NONE) {
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printf("\n");
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}
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}
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if (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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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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// Correct RSRP and RSSI measurements
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result->rssi /= pow(10, 8);
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result->rsrp /= pow(10, 8);
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ue_sync_free(&ue_sync);
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return 0;
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}
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@ -1,64 +0,0 @@
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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
|
||||
* 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
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* and at http://www.gnu.org/licenses/.
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*
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*/
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#include "liblte/phy/phy.h"
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typedef struct {
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int pss_max_frames;
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int pbch_max_frames;
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float cell_detect_early_stop_threshold;
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int measure_avg_nof_frames;
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char *uhd_args;
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} cell_scanner_config_t;
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typedef struct {
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lte_cell_t phy_cell;
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uint32_t cell_id;
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float rsrp;
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float rsrq;
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float rssi;
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float snr;
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} cell_scanner_result_t;
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typedef struct {
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cell_scanner_config_t config;
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void *uhd;
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} cell_scanner_t;
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int cell_scanner_init(cell_scanner_t *q,
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cell_scanner_config_t *config);
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void cell_scanner_close(cell_scanner_t *q);
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int cell_scanner_all_cells(cell_scanner_t *q,
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float frequency,
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cell_scanner_result_t *result);
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int cell_scanner_cell(cell_scanner_t *q,
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float frequency,
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int N_id_2,
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cell_scanner_result_t *result);
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@ -1,143 +0,0 @@
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/**
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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/.
|
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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/rrc/rrc.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_scanner.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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int force_N_id_2;
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char *uhd_args;
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float uhd_freq;
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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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}
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void usage(prog_args_t *args, char *prog) {
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printf("Usage: %s [alnv] -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-l Force N_id_2 [Default best]\n");
|
||||
printf("\t-n nof_subframes [Default %d]\n", args->nof_subframes);
|
||||
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, "alnvf")) != -1) {
|
||||
switch (opt) {
|
||||
case 'a':
|
||||
args->uhd_args = argv[optind];
|
||||
break;
|
||||
case 'f':
|
||||
args->uhd_freq = atof(argv[optind]);
|
||||
break;
|
||||
case 'n':
|
||||
args->nof_subframes = atoi(argv[optind]);
|
||||
break;
|
||||
case 'l':
|
||||
args->force_N_id_2 = atoi(argv[optind]);
|
||||
break;
|
||||
case 'v':
|
||||
verbose++;
|
||||
break;
|
||||
default:
|
||||
usage(args, argv[0]);
|
||||
exit(-1);
|
||||
}
|
||||
}
|
||||
if (args->uhd_freq < 0) {
|
||||
usage(args, argv[0]);
|
||||
exit(-1);
|
||||
}
|
||||
}
|
||||
/**********************************************************************/
|
||||
|
||||
int main(int argc, char **argv) {
|
||||
prog_args_t prog_args;
|
||||
cell_scanner_result_t result;
|
||||
cell_scanner_config_t cfg;
|
||||
cell_scanner_t cs;
|
||||
|
||||
parse_args(&prog_args, argc, argv);
|
||||
|
||||
// Peak-to-sidelobe ratio (PSR) threshold for cell detection early stopping.
|
||||
cfg.cell_detect_early_stop_threshold = 20.0; // This is a normal value.
|
||||
// maximum 5 ms frames that will be scanned maximum in the case the threshold is not exceed
|
||||
// ie for bad cells
|
||||
cfg.pss_max_frames = 50; // this is 250 ms
|
||||
|
||||
// maximum 5 ms frames that will be received to decode the PBCH
|
||||
// ie for bad cells
|
||||
cfg.pbch_max_frames = 500; // this is 2500 ms
|
||||
|
||||
// Number of 1 ms subframes that will be used to compute rsrp, rsrq, snr, etc average
|
||||
cfg.measure_avg_nof_frames = 1000; // 1 sec
|
||||
|
||||
cfg.uhd_args = prog_args.uhd_args;
|
||||
|
||||
// Init USRP
|
||||
if (cell_scanner_init(&cs, &cfg)) {
|
||||
fprintf(stderr, "Error initiating cell scanner\n");
|
||||
exit(-1);
|
||||
}
|
||||
|
||||
// Scan for a frequency
|
||||
if (prog_args.force_N_id_2 < 0) {
|
||||
// We have 2 options, either we scan for the three possible N_id_2 root sequences...
|
||||
cell_scanner_all_cells(&cs, prog_args.uhd_freq, &result);
|
||||
} else {
|
||||
// or we scan for a single one.
|
||||
cell_scanner_cell(&cs, prog_args.uhd_freq, prog_args.force_N_id_2, &result);
|
||||
}
|
||||
|
||||
printf("\nResult: CellID: %d, PHYID: %d, RSRP: %.1f dBm, RSRQ: %.1f dB, SNR: %.1f dB\n",
|
||||
result.cell_id, result.phy_cell.id,
|
||||
10*log10(result.rsrp*1000), 10*log10(result.rsrq), 10*log10(result.snr));
|
||||
}
|
||||
Loading…
Reference in New Issue