2014-01-28 03:41:17 -08:00
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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 "lte.h"
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char *input_file_name = NULL;
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int nof_slots=100;
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float corr_peak_threshold=2.5;
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int ntime = 4;
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int nfreq = 10;
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int file_binary = 0;
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int force_N_id_2=-1;
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filesource_t fsrc;
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cf_t *input_buffer, *fft_buffer;
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pbch_t pbch;
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dft_plan_t fft_plan;
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chest_t chest;
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sync_t synch;
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void usage(char *prog) {
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printf("Usage: %s [onlt] -i input_file\n", prog);
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printf("\t-n number of frames [Default %d]\n", nof_slots);
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printf("\t-t correlation threshold [Default %g]\n", corr_peak_threshold);
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printf("\t-v [set verbose to debug, default none]\n");
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printf("\t-b Input files is binary [Default %s]\n", file_binary?"yes":"no");
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printf("\t-f force_N_id_2 [Default %d]\n", force_N_id_2);
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}
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void parse_args(int argc, char **argv) {
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int opt;
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while ((opt = getopt(argc, argv, "intvbf")) != -1) {
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switch(opt) {
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case 'i':
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input_file_name = argv[optind];
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break;
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case 'n':
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nof_slots = atoi(argv[optind]);
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break;
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case 't':
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corr_peak_threshold = atof(argv[optind]);
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break;
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case 'b':
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file_binary = 1;
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break;
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case 'v':
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verbose++;
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break;
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case 'f':
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force_N_id_2 = atoi(argv[optind]);
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break;
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default:
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usage(argv[0]);
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exit(-1);
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}
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}
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if (!input_file_name) {
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usage(argv[0]);
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exit(-1);
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}
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}
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int base_init() {
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file_data_type_t type = file_binary?COMPLEX_FLOAT_BIN:COMPLEX_FLOAT;
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if (filesource_init(&fsrc, input_file_name, type)) {
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fprintf(stderr, "Error opening file %s\n", input_file_name);
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exit(-1);
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}
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input_buffer = malloc(4 * 960 * sizeof(cf_t));
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if (!input_buffer) {
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perror("malloc");
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exit(-1);
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}
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fft_buffer = malloc(CPNORM_NSYMB * 128 * sizeof(cf_t));
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if (!fft_buffer) {
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perror("malloc");
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return -1;
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}
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/* Init FFT plan */
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if (dft_plan_c2c(128, FORWARD, &fft_plan)) {
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fprintf(stderr, "Error initiating FFT plan\n");
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return -1;
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}
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fft_plan.options = DFT_DC_OFFSET | DFT_MIRROR_POS | DFT_NORMALIZE;
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DEBUG("Memory init OK\n",0);
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return 0;
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}
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int mib_decoder_init(int cell_id) {
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/*
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if (chest_LTEDL_init(&chest, ntime, nfreq, CPNORM_NSYMB, cell_id, 6)) {
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fprintf(stderr, "Error initiating LTE equalizer\n");
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return -1;
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}
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*/
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DEBUG("Channel estimation initiated ntime=%d nfreq=%d\n", ntime, nfreq);
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if (pbch_init(&pbch, cell_id, CPNORM)) {
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fprintf(stderr, "Error initiating PBCH\n");
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return -1;
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}
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DEBUG("PBCH initiated cell_id=%d\n", cell_id);
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return 0;
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}
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void fft_run_slot(dft_plan_t *fft_plan, cf_t *input, cf_t *output) {
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int i;
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for (i=0;i<CPNORM_NSYMB;i++) {
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DEBUG("Running FFT %d\n", i);
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input += CP_NORM(i, 128);
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dft_run_c2c(fft_plan, input, output);
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input += 128;
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output += 128;
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}
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}
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int mib_decoder_run(cf_t *input, pbch_mib_t *mib) {
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fft_run_slot(&fft_plan, input, fft_buffer);
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DEBUG("Decoding PBCH\n", 0);
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return pbch_decode(&pbch, fft_buffer, mib, 6, 1);
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}
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int get_samples(int length, int offset) {
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int n = 0;
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if (length != -1 && offset != -1) {
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while(n < length) {
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DEBUG("Reading %d samples offset=%d\n", length - n, offset + n);
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n = filesource_read(&fsrc, &input_buffer[offset + n], length - n);
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if (n == -1) {
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fprintf(stderr, "Error reading %d samples from file\n", length - n);
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break;
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} else if (n == 0) {
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printf("End of file\n");
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return -1;
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}
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}
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return n;
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} else {
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return -1;
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}
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}
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enum radio_state { DONE, SYNC, MIB};
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int main(int argc, char **argv) {
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enum radio_state state;
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int sf_size, slot_start;
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int read_length, slot_idx;
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int mib_attempts;
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pbch_mib_t mib;
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int cell_id;
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int idx;
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int frame_cnt;
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int read_offset;
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float cfo;
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if (argc < 3) {
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usage(argv[0]);
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exit(-1);
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}
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parse_args(argc,argv);
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if (base_init()) {
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fprintf(stderr, "Error initializing memory\n");
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exit(-1);
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}
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2014-01-30 06:45:59 -08:00
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if (sync_init(&synch, 960)) {
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2014-01-28 03:41:17 -08:00
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fprintf(stderr, "Error initiating PSS/SSS\n");
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exit(-1);
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}
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sync_force_N_id_2(&synch, force_N_id_2);
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sync_set_threshold(&synch, corr_peak_threshold);
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state = SYNC;
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sf_size = 960;
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read_length = sf_size;
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slot_start = 0;
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slot_idx = 0;
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mib_attempts = 0;
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frame_cnt = -1;
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read_offset = 0;
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cfo = 0.0;
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printf("\n\n-- Initiating MIB search --\n\n");
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while(state != DONE && frame_cnt < nof_slots) {
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if (get_samples(read_length, read_offset) == -1) {
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fprintf(stderr, "Error reading %d samples sf_start=%d\n", read_length, slot_start);
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break;
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}
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if (read_length) {
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frame_cnt++;
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INFO("\n\tSlot idx=%d\n\n", slot_idx);
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INFO("Correcting CFO=%.4f\n", cfo);
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nco_cexp_f_direct(&input_buffer[read_offset], -cfo/128, read_length);
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}
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switch(state) {
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case SYNC:
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INFO("State Sync, Slot idx=%d\n", slot_idx);
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idx = sync_run(&synch, input_buffer, read_offset);
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if (idx != -1) {
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slot_start = read_offset + idx;
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read_length = idx;
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read_offset += 960;
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cell_id = sync_get_cell_id(&synch);
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cfo = sync_get_cfo(&synch);
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slot_idx = sync_get_slot_id(&synch);
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state = MIB;
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if (mib_decoder_init(cell_id)) {
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fprintf(stderr, "Error initiating MIB decoder\n");
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exit(-1);
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}
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INFO("SYNC done, cell_id=%d slot_start=%d\n", cell_id, slot_start);
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} else {
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read_offset = 960;
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memcpy(input_buffer, &input_buffer[960], 960 * sizeof(cf_t));
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}
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break;
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case MIB:
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read_length = 960;
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read_offset = slot_start;
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INFO("State MIB, Slot idx=%d\n", slot_idx);
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if (slot_idx == 1) {
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INFO("Trying to find MIB offset %d\n", slot_start);
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if (mib_decoder_run(&input_buffer[slot_start], &mib)) {
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INFO("MIB detected attempt=%d\n", mib_attempts);
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state = DONE;
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} else {
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INFO("MIB not detected attempt=%d\n", mib_attempts);
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if (mib_attempts >= 4) {
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state = SYNC;
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}
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}
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mib_attempts++;
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}
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break;
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case DONE:
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INFO("State Done, Slot idx=%d\n", slot_idx);
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pbch_mib_fprint(stdout, &mib);
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printf("Done\n");
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break;
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}
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if (read_length) {
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slot_idx++;
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if (slot_idx == 20) {
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slot_idx = 0;
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}
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}
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}
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sync_free(&synch);
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filesource_close(&fsrc);
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free(input_buffer);
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printf("Done\n");
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exit(0);
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}
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