int dci_format1_unpack(dci_msg_t *msg, ra_pdsch_t *data, int nof_prb) {
/* pack bits */
char *y = msg->data;
/* Make sure it's a Format1 message */
if (msg->location.nof_bits != dci_format_sizeof(Format1, nof_prb)) {
fprintf(stderr, "Invalid message length for format 1\n");
return -1;
}
if (nof_prb > 10) {
data->alloc_type = *y++;
} else {
data->alloc_type = alloc_type0;
}
/* Resource allocation: type0 or type 1 */
int P = ra_type0_P(nof_prb);
int alloc_size = (int) ceilf((float) nof_prb / P);
switch (data->alloc_type) {
case alloc_type0:
data->type0_alloc.rbg_bitmask = bit_unpack(&y, alloc_size);
break;
case alloc_type1:
data->type1_alloc.rbg_subset = bit_unpack(&y, (int) ceilf(log2f(P)));
data->type1_alloc.shift = *y++ ? true : false;
data->type1_alloc.vrb_bitmask = bit_unpack(&y,
alloc_size - (int) ceilf(log2f(P)) - 1);
break;
default:
fprintf(stderr,
"Format 1 accepts type0 or type1 resource allocation only\n");
return -1;
}
/* pack MCS according to 7.1.7 of 36.213 */
uint32_t mcs = bit_unpack(&y, 5);
data->mcs.mcs_idx = mcs;
ra_mcs_from_idx_dl(mcs, &data->mcs);
data->mcs.tbs = ra_tbs_from_idx(data->mcs.tbs_idx, ra_nprb_dl(data, nof_prb));
/* harq process number */
data->harq_process = bit_unpack(&y, 3);
data->ndi = *y++ ? true : false;
// rv version
data->rv_idx = bit_unpack(&y, 2);
// TPC not implemented
return 0;
}
int main(int argc, char **argv) {
int nf, sf_idx, N_id_2;
cf_t pss_signal[PSS_LEN];
float sss_signal0[SSS_LEN]; // for subframe 0
float sss_signal5[SSS_LEN]; // for subframe 5
pbch_mib_t mib;
ra_pdsch_t ra_dl;
ra_prb_t prb_alloc;
refsignal_t refs[NSLOTS_X_FRAME];
int i, n;
char *data;
cf_t *sf_symbols[MAX_PORTS];
dci_msg_t dci_msg;
dci_location_t locations[NSUBFRAMES_X_FRAME][10];
#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 * CPNORM_NSYMB * cell.nof_prb * RE_X_RB;
sf_n_samples = 2 * SLOT_LEN(lte_symbol_sz(cell.nof_prb));
/* this *must* be called after setting slot_len_* */
base_init();
/* Generate PSS/SSS signals */
pss_generate(pss_signal, N_id_2);
sss_generate(sss_signal0, sss_signal5, cell.id);
/* Generate CRS signals */
for (i = 0; i < NSLOTS_X_FRAME; i++) {
if (refsignal_init_LTEDL(&refs[i], 0, i, cell)) {
fprintf(stderr, "Error initiating CRS slot=%d\n", i);
return -1;
}
}
mib.nof_ports = cell.nof_ports;
mib.nof_prb = cell.nof_prb;
mib.phich_length = PHICH_NORM;
mib.phich_resources = R_1;
mib.sfn = 0;
for (i = 0; i < MAX_PORTS; i++) { // now there's only 1 port
sf_symbols[i] = sf_buffer;
}
#ifndef DISABLE_UHD
if (!output_file_name) {
printf("Set TX rate: %.2f MHz\n",
cuhd_set_tx_srate(uhd, lte_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);
}
#endif
bzero(&ra_dl, sizeof(ra_pdsch_t));
ra_dl.harq_process = 0;
ra_dl.mcs_idx = mcs_idx;
ra_dl.ndi = 0;
ra_dl.rv_idx = 0;
ra_dl.alloc_type = alloc_type0;
ra_dl.type0_alloc.rbg_bitmask = 0xffffffff;
dci_msg_pack_pdsch(&ra_dl, &dci_msg, Format1, cell.nof_prb, false);
ra_prb_get_dl(&prb_alloc, &ra_dl, cell.nof_prb);
ra_prb_get_re_dl(&prb_alloc, cell.nof_prb, 1, cell.nof_prb<10?(cfi+1):cfi, CPNORM);
ra_mcs_from_idx_dl(mcs_idx, cell.nof_prb, &ra_dl.mcs);
ra_pdsch_fprint(stdout, &ra_dl, cell.nof_prb);
/* Initiate valid DCI locations */
for (i=0;i<NSUBFRAMES_X_FRAME;i++) {
pdcch_ue_locations(&pdcch, locations[i], 10, i, cfi, 1234);
}
data = malloc(sizeof(char) * ra_dl.mcs.tbs);
if (!data) {
perror("malloc");
exit(-1);
}
nf = 0;
if (pdsch_harq_setup(&harq_process, ra_dl.mcs, &prb_alloc)) {
fprintf(stderr, "Error configuring HARQ process\n");
exit(-1);
}
while (nf < nof_frames || nof_frames == -1) {
for (sf_idx = 0; sf_idx < NSUBFRAMES_X_FRAME && (nf < nof_frames || nof_frames == -1); sf_idx++) {
bzero(sf_buffer, sizeof(cf_t) * sf_n_re);
if (sf_idx == 0 || sf_idx == 5) {
pss_put_slot(pss_signal, sf_buffer, cell.nof_prb, CPNORM);
sss_put_slot(sf_idx ? sss_signal5 : sss_signal0, sf_buffer, cell.nof_prb,
CPNORM);
}
if (sf_idx == 0) {
pbch_encode(&pbch, &mib, sf_symbols);
}
for (n=0;n<2;n++) {
refsignal_put(&refs[2*sf_idx+n], &sf_buffer[n*sf_n_re/2]);
}
pcfich_encode(&pcfich, cfi, sf_symbols, sf_idx);
INFO("SF: %d, Generating %d random bits\n", sf_idx, ra_dl.mcs.tbs);
for (i=0;i<ra_dl.mcs.tbs;i++) {
data[i] = rand()%2;
}
INFO("Puttting DCI to location: n=%d, L=%d\n", locations[sf_idx][0].ncce, locations[sf_idx][0].L);
if (pdcch_encode(&pdcch, &dci_msg, locations[sf_idx][0], 1234, sf_symbols, sf_idx, cfi)) {
fprintf(stderr, "Error encoding DCI message\n");
exit(-1);
}
if (pdsch_encode(&pdsch, data, sf_symbols, sf_idx, &harq_process, ra_dl.rv_idx)) {
fprintf(stderr, "Error encoding PDSCH\n");
exit(-1);
}
/* Transform to OFDM symbols */
lte_ifft_run_sf(&ifft, sf_buffer, output_buffer);
/* send to file or usrp */
if (output_file_name) {
filesink_write(&fsink, output_buffer, sf_n_samples);
usleep(5000);
} else {
#ifndef DISABLE_UHD
vec_sc_prod_cfc(output_buffer, uhd_amp, output_buffer, sf_n_samples);
cuhd_send(uhd, output_buffer, sf_n_samples, true);
#endif
}
nf++;
}
mib.sfn = (mib.sfn + 1) % 1024;
printf("SFN: %4d\r", mib.sfn);
fflush(stdout);
}
base_free();
printf("Done\n");
exit(0);
}
