int srslte_ue_dl_decode_estimate(srslte_ue_dl_t *q, uint32_t sf_idx, uint32_t *cfi) {
float cfi_corr;
if (q && cfi && sf_idx < SRSLTE_NSUBFRAMES_X_FRAME) {
/* Get channel estimates for each port */
srslte_chest_dl_estimate(&q->chest, q->sf_symbols, q->ce, sf_idx);
/* First decode PCFICH and obtain CFI */
if (srslte_pcfich_decode(&q->pcfich, q->sf_symbols, q->ce,
srslte_chest_dl_get_noise_estimate(&q->chest), sf_idx, cfi, &cfi_corr)<0) {
fprintf(stderr, "Error decoding PCFICH\n");
return SRSLTE_ERROR;
}
INFO("Decoded CFI=%d with correlation %.2f, sf_idx=%d\n", *cfi, cfi_corr, sf_idx);
if (srslte_regs_set_cfi(&q->regs, *cfi)) {
fprintf(stderr, "Error setting CFI\n");
return SRSLTE_ERROR;
}
return SRSLTE_SUCCESS;
} else {
return SRSLTE_ERROR_INVALID_INPUTS;
}
}
int base_init() {
int i;
if (srslte_filesource_init(&fsrc, input_file_name, SRSLTE_COMPLEX_FLOAT_BIN)) {
fprintf(stderr, "Error opening file %s\n", input_file_name);
exit(-1);
}
flen = 2 * (SRSLTE_SLOT_LEN(srslte_symbol_sz(cell.nof_prb)));
input_buffer = malloc(flen * sizeof(cf_t));
if (!input_buffer) {
perror("malloc");
exit(-1);
}
fft_buffer = malloc(SRSLTE_SF_LEN_RE(cell.nof_prb, cell.cp) * sizeof(cf_t));
if (!fft_buffer) {
perror("malloc");
return -1;
}
for (i=0;i<SRSLTE_MAX_PORTS;i++) {
ce[i] = malloc(SRSLTE_SF_LEN_RE(cell.nof_prb, cell.cp) * sizeof(cf_t));
if (!ce[i]) {
perror("malloc");
return -1;
}
}
if (srslte_chest_dl_init(&chest, cell)) {
fprintf(stderr, "Error initializing equalizer\n");
return -1;
}
if (srslte_ofdm_rx_init(&fft, cell.cp, cell.nof_prb)) {
fprintf(stderr, "Error initializing FFT\n");
return -1;
}
if (srslte_regs_init(®s, cell)) {
fprintf(stderr, "Error initiating regs\n");
return -1;
}
if (srslte_regs_set_cfi(®s, cfi)) {
fprintf(stderr, "Error setting CFI %d\n", cfi);
return -1;
}
if (srslte_pdcch_init(&pdcch, ®s, cell)) {
fprintf(stderr, "Error creating PDCCH object\n");
exit(-1);
}
DEBUG("Memory init OK\n",0);
return 0;
}