int srslte_dft_precoding_init_tx(srslte_dft_precoding_t *q, uint32_t max_prb) { return srslte_dft_precoding_init(q, max_prb, true); }
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); }
int srslte_dft_precoding_init_rx(srslte_dft_precoding_t *q, uint32_t max_prb) { return srslte_dft_precoding_init(q, max_prb, false); }