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@ -32,6 +32,7 @@
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#include <unistd.h>
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#include <unistd.h>
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#include <math.h>
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#include <math.h>
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#include <sys/time.h>
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#include <sys/time.h>
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#include <signal.h>
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#include <unistd.h>
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#include <unistd.h>
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@ -55,10 +56,22 @@
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int band = -1;
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int band = -1;
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int earfcn_start=-1, earfcn_end = -1;
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int earfcn_start=-1, earfcn_end = -1;
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cell_search_cfg_t config = {100, 10, 10.0, 50};
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cell_search_cfg_t config = {
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50, // maximum number of 5ms frames to capture for MIB decoding
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50, // maximum number of 5ms frames to capture for PSS correlation
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float uhd_gain = 60.0;
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4.0, // early-stops cell detection if mean PSR is above this value
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0 // 0 or negative to disable AGC
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};
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struct cells {
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srslte_cell_t cell;
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float freq;
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int dl_earfcn;
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float power;
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};
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struct cells results[1024];
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float uhd_gain = 70.0;
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char *uhd_args="";
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char *uhd_args="";
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void usage(char *prog) {
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void usage(char *prog) {
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@ -116,6 +129,15 @@ int cuhd_recv_wrapper(void *h, void *data, uint32_t nsamples, srslte_timestamp_t
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return cuhd_recv(h, data, nsamples, 1);
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return cuhd_recv(h, data, nsamples, 1);
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}
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}
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bool go_exit = false;
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void sig_int_handler(int signo)
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{
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if (signo == SIGINT) {
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go_exit = true;
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}
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}
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int main(int argc, char **argv) {
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int main(int argc, char **argv) {
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int n;
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int n;
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void *uhd;
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void *uhd;
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@ -124,15 +146,27 @@ int main(int argc, char **argv) {
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int nof_freqs;
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int nof_freqs;
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srslte_earfcn_t channels[MAX_EARFCN];
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srslte_earfcn_t channels[MAX_EARFCN];
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uint32_t freq;
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uint32_t freq;
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uint32_t n_found_cells=0;
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parse_args(argc, argv);
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parse_args(argc, argv);
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printf("Opening UHD device...\n");
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if (!config.init_agc) {
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if (cuhd_open(uhd_args, &uhd)) {
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printf("Opening UHD device...\n");
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fprintf(stderr, "Error opening uhd\n");
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if (cuhd_open(uhd_args, &uhd)) {
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exit(-1);
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fprintf(stderr, "Error opening uhd\n");
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exit(-1);
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}
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cuhd_set_rx_gain(uhd, uhd_gain);
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} else {
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printf("Opening UHD device with threaded RX Gain control ...\n");
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if (cuhd_open_th(uhd_args, &uhd, false)) {
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fprintf(stderr, "Error opening uhd\n");
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exit(-1);
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}
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cuhd_set_rx_gain(uhd, 50);
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}
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}
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cuhd_set_rx_gain(uhd, uhd_gain);
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// Supress UHD messages
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cuhd_supress_stdout();
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nof_freqs = srslte_band_get_fd_band(band, channels, earfcn_start, earfcn_end, MAX_EARFCN);
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nof_freqs = srslte_band_get_fd_band(band, channels, earfcn_start, earfcn_end, MAX_EARFCN);
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if (nof_freqs < 0) {
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if (nof_freqs < 0) {
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@ -140,15 +174,17 @@ int main(int argc, char **argv) {
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exit(-1);
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exit(-1);
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}
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}
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for (freq=0;freq<nof_freqs;freq++) {
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signal(SIGINT, sig_int_handler);
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for (freq=0;freq<nof_freqs && !go_exit;freq++) {
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/* set uhd_freq */
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/* set uhd_freq */
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cuhd_set_rx_freq(uhd, (double) channels[freq].fd * MHZ);
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cuhd_set_rx_freq(uhd, (double) channels[freq].fd * MHZ);
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cuhd_rx_wait_lo_locked(uhd);
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cuhd_rx_wait_lo_locked(uhd);
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INFO("Set uhd_freq to %.3f MHz\n", (double) channels[freq].fd * MHZ/1000000);
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INFO("Set uhd_freq to %.3f MHz\n", (double) channels[freq].fd * MHZ/1000000);
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printf("[%3d/%d]: EARFCN %d Freq. %.2f MHz looking for PSS. \n", freq, nof_freqs,
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printf("[%3d/%d]: EARFCN %d Freq. %.2f MHz looking for PSS.\n", freq, nof_freqs,
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channels[freq].id, channels[freq].fd);
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channels[freq].id, channels[freq].fd);fflush(stdout);
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if (SRSLTE_VERBOSE_ISINFO()) {
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if (SRSLTE_VERBOSE_ISINFO()) {
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printf("\n");
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printf("\n");
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@ -171,7 +207,7 @@ int main(int argc, char **argv) {
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srslte_ue_sync_start_agc(&cs.ue_sync, cuhd_set_rx_gain, config.init_agc);
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srslte_ue_sync_start_agc(&cs.ue_sync, cuhd_set_rx_gain, config.init_agc);
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}
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}
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INFO("Setting sampling frequency %.2f MHz for PSS search\n", SRSLTE_CS_SAMP_FREQ/1000);
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INFO("Setting sampling frequency %.2f MHz for PSS search\n", SRSLTE_CS_SAMP_FREQ/1000000);
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cuhd_set_rx_srate(uhd, SRSLTE_CS_SAMP_FREQ);
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cuhd_set_rx_srate(uhd, SRSLTE_CS_SAMP_FREQ);
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INFO("Starting receiver...\n", 0);
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INFO("Starting receiver...\n", 0);
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cuhd_start_rx_stream(uhd);
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cuhd_start_rx_stream(uhd);
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@ -180,9 +216,9 @@ int main(int argc, char **argv) {
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if (n < 0) {
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if (n < 0) {
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fprintf(stderr, "Error searching cell\n");
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fprintf(stderr, "Error searching cell\n");
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exit(-1);
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exit(-1);
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} else if (n == 1) {
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} else if (n > 0) {
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for (int i=0;i<3;i++) {
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for (int i=0;i<3;i++) {
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if (found_cells[i].peak > config.threshold/2) {
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if (found_cells[i].psr > config.threshold/2) {
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srslte_cell_t cell;
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srslte_cell_t cell;
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cell.id = found_cells[i].cell_id;
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cell.id = found_cells[i].cell_id;
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cell.cp = found_cells[i].cp;
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cell.cp = found_cells[i].cp;
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@ -193,13 +229,34 @@ int main(int argc, char **argv) {
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}
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}
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if (ret == SRSLTE_UE_MIB_FOUND) {
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if (ret == SRSLTE_UE_MIB_FOUND) {
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printf("Found CELL ID %d. %d PRB, %d ports\n",
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printf("Found CELL ID %d. %d PRB, %d ports\n",
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cell.id, cell.nof_prb, cell.nof_ports);
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cell.id,
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cell.nof_prb,
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cell.nof_ports);
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if (cell.nof_ports > 0) {
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memcpy(&results[n_found_cells].cell, &cell, sizeof(srslte_cell_t));
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results[n_found_cells].freq = channels[freq].fd;
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results[n_found_cells].dl_earfcn = channels[freq].id;
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results[n_found_cells].power = found_cells[i].peak;
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n_found_cells++;
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}
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}
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}
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}
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}
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}
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}
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}
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}
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}
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}
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printf("\n\nFound %d cells\n", n_found_cells);
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for (int i=0;i<n_found_cells;i++) {
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printf("Found CELL %.1f MHz, EARFCN=%d, PHYID=%d, %d PRB, %d ports, PSS power=%.1f dBm\n",
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results[i].freq,
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results[i].dl_earfcn,
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results[i].cell.id,
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results[i].cell.nof_prb,
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results[i].cell.nof_ports,
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10*log10(results[i].power));
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}
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printf("\nBye\n");
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printf("\nBye\n");
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cuhd_close(uhd);
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cuhd_close(uhd);
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