/* High-Level API */
int mod_initialize(srslte_mod_hl* hl) {
srslte_modem_table_init(&hl->obj);
if (srslte_modem_table_lte(&hl->obj,hl->init.std,false)) {
return -1;
}
return 0;
}
int srslte_modem_table_lte(srslte_modem_table_t* q, srslte_mod_t modulation) {
srslte_modem_table_init(q);
switch(modulation) {
case SRSLTE_MOD_LAST:
case SRSLTE_MOD_BPSK:
q->nbits_x_symbol = 1;
q->nsymbols = 2;
if (table_create(q)) {
return SRSLTE_ERROR;
}
set_BPSKtable(q->symbol_table);
break;
case SRSLTE_MOD_QPSK:
q->nbits_x_symbol = 2;
q->nsymbols = 4;
if (table_create(q)) {
return SRSLTE_ERROR;
}
set_QPSKtable(q->symbol_table);
break;
case SRSLTE_MOD_16QAM:
q->nbits_x_symbol = 4;
q->nsymbols = 16;
if (table_create(q)) {
return SRSLTE_ERROR;
}
set_16QAMtable(q->symbol_table);
break;
case SRSLTE_MOD_64QAM:
q->nbits_x_symbol = 6;
q->nsymbols = 64;
if (table_create(q)) {
return SRSLTE_ERROR;
}
set_64QAMtable(q->symbol_table);
break;
}
return SRSLTE_SUCCESS;
}
int main(int argc, char **argv) {
int sf_idx=0, N_id_2=0;
cf_t pss_signal[SRSLTE_PSS_LEN];
float sss_signal0[SRSLTE_SSS_LEN]; // for subframe 0
float sss_signal5[SRSLTE_SSS_LEN]; // for subframe 5
int i;
#ifdef DISABLE_UHD
if (argc < 3) {
usage(argv[0]);
exit(-1);
}
#endif
parse_args(argc, argv);
N_id_2 = cell.id % 3;
sf_n_re = 2 * SRSLTE_CP_NORM_NSYMB * cell.nof_prb * SRSLTE_NRE;
sf_n_samples = 2 * SRSLTE_SLOT_LEN(srslte_symbol_sz(cell.nof_prb));
cell.phich_length = SRSLTE_PHICH_NORM;
cell.phich_resources = SRSLTE_PHICH_R_1;
/* this *must* be called after setting slot_len_* */
base_init();
/* Generate PSS/SSS signals */
srslte_pss_generate(pss_signal, N_id_2);
srslte_sss_generate(sss_signal0, sss_signal5, cell.id);
printf("Set TX rate: %.2f MHz\n",
cuhd_set_tx_srate(uhd, srslte_sampling_freq_hz(cell.nof_prb)) / 1000000);
printf("Set TX gain: %.1f dB\n", cuhd_set_tx_gain(uhd, uhd_gain));
printf("Set TX freq: %.2f MHz\n",
cuhd_set_tx_freq(uhd, uhd_freq) / 1000000);
uint32_t nbits;
srslte_modem_table_t modulator;
srslte_modem_table_init(&modulator);
srslte_modem_table_lte(&modulator, modulation);
srslte_tcod_t turbocoder;
srslte_tcod_init(&turbocoder, SRSLTE_TCOD_MAX_LEN_CB);
srslte_dft_precoding_t dft_precod;
srslte_dft_precoding_init(&dft_precod, 12);
nbits = srslte_cbsegm_cbindex(sf_n_samples/8/srslte_mod_bits_x_symbol(modulation)/3 - 12);
uint32_t ncoded_bits = sf_n_samples/8/srslte_mod_bits_x_symbol(modulation);
uint8_t *data = malloc(sizeof(uint8_t)*nbits);
uint8_t *data_enc = malloc(sizeof(uint8_t)*ncoded_bits);
cf_t *symbols = malloc(sizeof(cf_t)*sf_n_samples);
bzero(data_enc, sizeof(uint8_t)*ncoded_bits);
while (1) {
for (sf_idx = 0; sf_idx < SRSLTE_NSUBFRAMES_X_FRAME; sf_idx++) {
bzero(sf_buffer, sizeof(cf_t) * sf_n_re);
#ifdef kk
if (sf_idx == 0 || sf_idx == 5) {
srslte_pss_put_slot(pss_signal, sf_buffer, cell.nof_prb, SRSLTE_CP_NORM);
srslte_sss_put_slot(sf_idx ? sss_signal5 : sss_signal0, sf_buffer, cell.nof_prb,
SRSLTE_CP_NORM);
/* Transform to OFDM symbols */
srslte_ofdm_tx_sf(&ifft, sf_buffer, output_buffer);
float norm_factor = (float) sqrtf(cell.nof_prb)/15;
srslte_vec_sc_prod_cfc(output_buffer, uhd_amp*norm_factor, output_buffer, SRSLTE_SF_LEN_PRB(cell.nof_prb));
} else {
#endif
/* Generate random data */
for (i=0;i<nbits;i++) {
data[i] = rand()%2;
}
srslte_tcod_encode(&turbocoder, data, data_enc, nbits);
srslte_mod_modulate(&modulator, data_enc, symbols, ncoded_bits);
srslte_interp_linear_offset_cabs(symbols, output_buffer, 8, sf_n_samples/8, 0, 0);
// }
/* send to usrp */
srslte_vec_sc_prod_cfc(output_buffer, uhd_amp, output_buffer, sf_n_samples);
cuhd_send(uhd, output_buffer, sf_n_samples, true);
}
}
base_free();
printf("Done\n");
exit(0);
}
void srslte_modem_table_reset(srslte_modem_table_t* q) {
srslte_modem_table_free(q);
srslte_modem_table_init(q);
}
