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srsRAN_4G
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Merge branch 'next' into raa

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master
Ismael Gomez 7 years ago
parent 2cf6f96f24 a568db3b04
commit feb093aa07
1 changed files with 298 additions and 315 deletions
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311
lib/src/phy/phch/prach.c
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@ -57,18 +57,18 @@ float save_corr[4096];
uint32_t prach_Tcp[5] = {3168, 21024, 6240, 21024, 448};
// Table 5.7.1-1 T_seq for preamble formats
uint32_t prach_Tseq[5] = {24576, 24576, 2*24576, 2*24576, 4096};
uint32_t prach_Tseq[5] = {24576, 24576, 2 * 24576, 2 * 24576, 4096};
// Table 5.7.2-2 - N_cs values for unrestricted sets
uint32_t prach_Ncs_unrestricted[16] = {0,13,15,18,22,26,32,38,46,59,76,93,119,167,279,419};
uint32_t prach_Ncs_unrestricted[16] = {0, 13, 15, 18, 22, 26, 32, 38, 46, 59, 76, 93, 119, 167, 279, 419};
#define MAX_N_zc 839
// Table 5.7.2-2 - N_cs values for restricted sets
uint32_t prach_Ncs_restricted[15] = {15,18,22,26,32,38,46,55,68,82,100,128,158,202,237};
uint32_t prach_Ncs_restricted[15] = {15, 18, 22, 26, 32, 38, 46, 55, 68, 82, 100, 128, 158, 202, 237};
// Table 5.7.2-3 - N_cs values for preamble format 4
uint32_t prach_Ncs_format4[7] = {2,4,6,8,10,12,15};
uint32_t prach_Ncs_format4[7] = {2, 4, 6, 8, 10, 12, 15};
// Table 5.7.2-4 - Root ZC sequence order
uint32_t prach_zc_roots[838] = {
@ -158,7 +158,6 @@ uint32_t prach_zc_roots_format4[138] = {
61, 78, 62, 77, 63, 76, 64, 75, 65, 74, 66, 73,
67, 72, 68, 71, 69, 70};
srslte_prach_sf_config_t prach_sf_config[16] = {
{1, {1, 0, 0, 0, 0}},
{1, {4, 0, 0, 0, 0}},
@ -178,11 +177,11 @@ srslte_prach_sf_config_t prach_sf_config[16] = {
{1, {9, 0, 0, 0, 0}}};
uint32_t srslte_prach_get_preamble_format(uint32_t config_idx) {
return config_idx/16;
return config_idx / 16;
}
srslte_prach_sfn_t srslte_prach_get_sfn(uint32_t config_idx) {
if ((config_idx%16)<3 || (config_idx%16)==15) {
if ((config_idx % 16) < 3 || (config_idx % 16) == 15) {
return SRSLTE_PRACH_SFN_EVEN;
} else {
return SRSLTE_PRACH_SFN_ANY;
@ -192,26 +191,23 @@ srslte_prach_sfn_t srslte_prach_get_sfn(uint32_t config_idx) {
/* Returns true if current_tti is a valid opportunity for PRACH transmission and the is an allowed subframe,
* or allowed_subframe == -1
*/
bool srslte_prach_tti_opportunity(srslte_prach_t *p, uint32_t current_tti, int allowed_subframe)
{
bool srslte_prach_tti_opportunity(srslte_prach_t *p, uint32_t current_tti, int allowed_subframe) {
uint32_t config_idx = p->config_idx;
// Get SFN and sf_idx from the PRACH configuration index
srslte_prach_sfn_t prach_sfn = srslte_prach_get_sfn(config_idx);
// This is the only option which provides always an opportunity for PRACH transmission.
if(config_idx == 14) {
if (config_idx == 14) {
return true;
}
if ((prach_sfn == SRSLTE_PRACH_SFN_EVEN && ((current_tti/10)%2)==0) ||
prach_sfn == SRSLTE_PRACH_SFN_ANY)
{
if ((prach_sfn == SRSLTE_PRACH_SFN_EVEN && ((current_tti / 10) % 2) == 0) ||
prach_sfn == SRSLTE_PRACH_SFN_ANY) {
srslte_prach_sf_config_t sf_config;
srslte_prach_sf_config(config_idx, &sf_config);
for (int i=0;i<sf_config.nof_sf;i++) {
if (((current_tti%10) == sf_config.sf[i] && allowed_subframe == -1) ||
((current_tti%10) == sf_config.sf[i] && (current_tti%10) == allowed_subframe))
{
for (int i = 0; i < sf_config.nof_sf; i++) {
if (((current_tti % 10) == sf_config.sf[i] && allowed_subframe == -1) ||
((current_tti % 10) == sf_config.sf[i] && (current_tti % 10) == allowed_subframe)) {
return true;
}
}
@ -219,23 +215,19 @@ bool srslte_prach_tti_opportunity(srslte_prach_t *p, uint32_t current_tti, int a
return false;
}
void srslte_prach_sf_config(uint32_t config_idx, srslte_prach_sf_config_t *sf_config) {
memcpy(sf_config, &prach_sf_config[config_idx%16], sizeof(srslte_prach_sf_config_t));
memcpy(sf_config, &prach_sf_config[config_idx % 16], sizeof(srslte_prach_sf_config_t));
}
// For debug use only
void print(void *d, uint32_t size, uint32_t len, char* file_str)
{
void print(void *d, uint32_t size, uint32_t len, char *file_str) {
FILE *f;
f = fopen(file_str, "wb");
fwrite(d , size, len, f);
fwrite(d, size, len, f);
fclose(f);
}
int srslte_prach_gen_seqs(srslte_prach_t *p)
{
int srslte_prach_gen_seqs(srslte_prach_t *p) {
uint32_t u = 0;
uint32_t v = 1;
int v_max = 0;
@ -249,79 +241,86 @@ int srslte_prach_gen_seqs(srslte_prach_t *p)
cf_t root[839];
// Generate our 64 preamble sequences
for(int i=0;i<N_SEQS;i++){
for (int i = 0; i < N_SEQS; i++) {
if(v > v_max){
if (v > v_max) {
// Get a new root sequence
if(4 == p->f){
u = prach_zc_roots_format4[(p->rsi + p->N_roots)%138];
}else{
u = prach_zc_roots[(p->rsi + p->N_roots)%838];
if (4 == p->f) {
u = prach_zc_roots_format4[(p->rsi + p->N_roots) % 138];
} else {
u = prach_zc_roots[(p->rsi + p->N_roots) % 838];
}
for(int j=0;j<p->N_zc;j++){
double phase = -M_PI*u*j*(j+1)/p->N_zc;
root[j] = cexp(phase*I);
for (int j = 0; j < p->N_zc; j++) {
double phase = -M_PI * u * j * (j + 1) / p->N_zc;
root[j] = cexp(phase * I);
}
p->root_seqs_idx[p->N_roots++] = i;
// Determine v_max
if(p->hs){
if (p->hs) {
// High-speed cell
for(p_=1; p_<=p->N_zc; p_++){
if(((p_*u) % p->N_zc) == 1)
for (p_ = 1; p_ <= p->N_zc; p_++) {
if (((p_ * u) % p->N_zc) == 1)
break;
}
if(p_ < p->N_zc/2){
if (p_ < p->N_zc / 2) {
d_u = p_;
}else{
} else {
d_u = p->N_zc - p_;
}
if(d_u >= p->N_cs && d_u < p->N_zc/3){
N_shift = d_u/p->N_cs;
d_start = 2*d_u + N_shift*p->N_cs;
N_group = p->N_zc/d_start;
N_neg_shift = (p->N_zc - 2*d_u - N_group*d_start)/p->N_cs;
if(N_neg_shift < 0)
if (d_u >= p->N_cs && d_u < p->N_zc / 3) {
N_shift = d_u / p->N_cs;
d_start = 2 * d_u + N_shift * p->N_cs;
N_group = p->N_zc / d_start;
if (p->N_zc > 2 * d_u + N_group * d_start) {
N_neg_shift = (p->N_zc - 2 * d_u - N_group * d_start) / p->N_cs;
} else {
N_neg_shift = 0;
}else{
N_shift = (p->N_zc - 2*d_u)/p->N_cs;
d_start = p->N_zc - 2*d_u + N_shift*p->N_cs;
N_group = d_u/d_start;
N_neg_shift = (d_u - N_group*d_start)/p->N_cs;
if(N_neg_shift < 0)
}
} else if (p->N_zc / 3 <= d_u && d_u <= (p->N_zc - p->N_cs) / 2) {
N_shift = (p->N_zc - 2 * d_u) / p->N_cs;
d_start = p->N_zc - 2 * d_u + N_shift * p->N_cs;
N_group = d_u / d_start;
N_neg_shift = (d_u - N_group * d_start) / p->N_cs;
if (N_neg_shift < 0)
N_neg_shift = 0;
if(N_neg_shift > N_shift)
if (N_neg_shift > N_shift)
N_neg_shift = N_shift;
} else {
N_shift = 0;
}
v_max = N_shift*N_group + N_neg_shift - 1;
if(v_max < 0){
v_max = N_shift * N_group + N_neg_shift - 1;
if (v_max < 0) {
v_max = 0;
}
}else{
} else {
// Normal cell
if(0 == p->N_cs){
if (0 == p->N_cs) {
v_max = 0;
}else{
v_max = (p->N_zc/p->N_cs)-1;
} else {
v_max = (p->N_zc / p->N_cs) - 1;
}
}
v=0;
v = 0;
}
// Shift root and add to set
if(p->hs){
if(N_shift==0){
if (p->hs) {
if (N_shift == 0) {
C_v = 0;
}else{
C_v = d_start*floor(v/N_shift) + (v % N_shift)*p->N_cs;
} else {
C_v = d_start * floor(v / N_shift) + (v % N_shift) * p->N_cs;
}
}else{
C_v = v*p->N_cs;
} else {
C_v = v * p->N_cs;
}
for(int j=0;j<p->N_zc;j++){
p->seqs[i][j] = root[(j+C_v) % p->N_zc];
if (i == 46) {
printf("i=%d, C_v=%d\n", i, C_v);
}
for (int j = 0; j < p->N_zc; j++) {
p->seqs[i][j] = root[(j + C_v) % p->N_zc];
}
v++;
@ -329,8 +328,7 @@ int srslte_prach_gen_seqs(srslte_prach_t *p)
return 0;
}
int srslte_prach_init_cfg(srslte_prach_t *p, srslte_prach_cfg_t *cfg, uint32_t nof_prb)
{
int srslte_prach_init_cfg(srslte_prach_t *p, srslte_prach_cfg_t *cfg, uint32_t nof_prb) {
if (srslte_prach_init(p, srslte_symbol_sz(nof_prb))) {
return -1;
}
@ -342,51 +340,49 @@ int srslte_prach_init_cfg(srslte_prach_t *p, srslte_prach_cfg_t *cfg, uint32_t n
cfg->zero_corr_zone);
}
int srslte_prach_init(srslte_prach_t *p, uint32_t max_N_ifft_ul)
{
int srslte_prach_init(srslte_prach_t *p, uint32_t max_N_ifft_ul) {
int ret = SRSLTE_ERROR;
if(p != NULL &&
max_N_ifft_ul < 2049)
{
if (p != NULL &&
max_N_ifft_ul < 2049) {
bzero(p, sizeof(srslte_prach_t));
p->max_N_ifft_ul = max_N_ifft_ul;
// Set up containers
p->prach_bins = srslte_vec_malloc(sizeof(cf_t)*MAX_N_zc);
p->corr_spec = srslte_vec_malloc(sizeof(cf_t)*MAX_N_zc);
p->corr = srslte_vec_malloc(sizeof(float)*MAX_N_zc);
p->prach_bins = srslte_vec_malloc(sizeof(cf_t) * MAX_N_zc);
p->corr_spec = srslte_vec_malloc(sizeof(cf_t) * MAX_N_zc);
p->corr = srslte_vec_malloc(sizeof(float) * MAX_N_zc);
// Set up ZC FFTS
if(srslte_dft_plan(&p->zc_fft, MAX_N_zc, SRSLTE_DFT_FORWARD, SRSLTE_DFT_COMPLEX)){
if (srslte_dft_plan(&p->zc_fft, MAX_N_zc, SRSLTE_DFT_FORWARD, SRSLTE_DFT_COMPLEX)) {
return SRSLTE_ERROR;
}
srslte_dft_plan_set_mirror(&p->zc_fft, false);
srslte_dft_plan_set_norm(&p->zc_fft, true);
if(srslte_dft_plan(&p->zc_ifft, MAX_N_zc, SRSLTE_DFT_BACKWARD, SRSLTE_DFT_COMPLEX)){
if (srslte_dft_plan(&p->zc_ifft, MAX_N_zc, SRSLTE_DFT_BACKWARD, SRSLTE_DFT_COMPLEX)) {
return SRSLTE_ERROR;
}
srslte_dft_plan_set_mirror(&p->zc_ifft, false);
srslte_dft_plan_set_norm(&p->zc_ifft, false);
uint32_t fft_size_alloc = max_N_ifft_ul * DELTA_F/DELTA_F_RA;
uint32_t fft_size_alloc = max_N_ifft_ul * DELTA_F / DELTA_F_RA;
p->ifft_in = (cf_t*)srslte_vec_malloc(fft_size_alloc*sizeof(cf_t));
p->ifft_out = (cf_t*)srslte_vec_malloc(fft_size_alloc*sizeof(cf_t));
if(srslte_dft_plan(&p->ifft, fft_size_alloc, SRSLTE_DFT_BACKWARD, SRSLTE_DFT_COMPLEX)) {
p->ifft_in = (cf_t *) srslte_vec_malloc(fft_size_alloc * sizeof(cf_t));
p->ifft_out = (cf_t *) srslte_vec_malloc(fft_size_alloc * sizeof(cf_t));
if (srslte_dft_plan(&p->ifft, fft_size_alloc, SRSLTE_DFT_BACKWARD, SRSLTE_DFT_COMPLEX)) {
fprintf(stderr, "Error creating DFT plan\n");
return -1;
}
srslte_dft_plan_set_mirror(&p->ifft, true);
srslte_dft_plan_set_norm(&p->ifft, true);
if(srslte_dft_plan(&p->fft, fft_size_alloc, SRSLTE_DFT_FORWARD, SRSLTE_DFT_COMPLEX)){
if (srslte_dft_plan(&p->fft, fft_size_alloc, SRSLTE_DFT_FORWARD, SRSLTE_DFT_COMPLEX)) {
fprintf(stderr, "Error creating DFT plan\n");
return -1;
}
p->signal_fft = srslte_vec_malloc(sizeof(cf_t)*fft_size_alloc);
p->signal_fft = srslte_vec_malloc(sizeof(cf_t) * fft_size_alloc);
if (!p->signal_fft) {
fprintf(stderr, "Error allocating memory\n");
return -1;
@ -403,20 +399,17 @@ int srslte_prach_init(srslte_prach_t *p, uint32_t max_N_ifft_ul)
return ret;
}
int srslte_prach_set_cell(srslte_prach_t *p,
uint32_t N_ifft_ul,
uint32_t config_idx,
uint32_t root_seq_index,
bool high_speed_flag,
uint32_t zero_corr_zone_config)
{
uint32_t zero_corr_zone_config) {
int ret = SRSLTE_ERROR;
if(p != NULL &&
if (p != NULL &&
N_ifft_ul < 2049 &&
config_idx < 64 &&
root_seq_index < MAX_ROOTS)
{
root_seq_index < MAX_ROOTS) {
if (N_ifft_ul > p->max_N_ifft_ul) {
fprintf(stderr, "PRACH: Error in set_cell(): N_ifft_ul must be lower or equal max_N_ifft_ul in init()\n");
return -1;
@ -432,7 +425,7 @@ int srslte_prach_set_cell(srslte_prach_t *p,
// Determine N_zc and N_cs
if(4 == preamble_format){
if (4 == preamble_format) {
if (p->zczc < 7) {
p->N_zc = 139;
p->N_cs = prach_Ncs_format4[p->zczc];
@ -440,16 +433,16 @@ int srslte_prach_set_cell(srslte_prach_t *p,
fprintf(stderr, "Invalid zeroCorrelationZoneConfig=%d for format4\n", p->zczc);
return SRSLTE_ERROR;
}
}else{
} else {
p->N_zc = MAX_N_zc;
if(p->hs){
if (p->hs) {
if (p->zczc < 15) {
p->N_cs = prach_Ncs_restricted[p->zczc];
} else {
fprintf(stderr, "Invalid zeroCorrelationZoneConfig=%d for restricted set\n", p->zczc);
return SRSLTE_ERROR;
}
}else{
} else {
if (p->zczc < 16) {
p->N_cs = prach_Ncs_unrestricted[p->zczc];
} else {
@ -461,10 +454,10 @@ int srslte_prach_set_cell(srslte_prach_t *p,
// Set up ZC FFTS
if (p->N_zc != MAX_N_zc) {
if(srslte_dft_replan(&p->zc_fft, p->N_zc)){
if (srslte_dft_replan(&p->zc_fft, p->N_zc)) {
return SRSLTE_ERROR;
}
if(srslte_dft_replan(&p->zc_ifft, p->N_zc)){
if (srslte_dft_replan(&p->zc_ifft, p->N_zc)) {
return SRSLTE_ERROR;
}
}
@ -474,16 +467,16 @@ int srslte_prach_set_cell(srslte_prach_t *p,
srslte_prach_gen_seqs(p);
// Generate sequence FFTs
for(int i=0;i<N_SEQS;i++){
for (int i = 0; i < N_SEQS; i++) {
srslte_dft_run(&p->zc_fft, p->seqs[i], p->dft_seqs[i]);
}
// Create our FFT objects and buffers
p->N_ifft_ul = N_ifft_ul;
if(4 == preamble_format){
p->N_ifft_prach = p->N_ifft_ul * DELTA_F/DELTA_F_RA_4;
}else{
p->N_ifft_prach = p->N_ifft_ul * DELTA_F/DELTA_F_RA;
if (4 == preamble_format) {
p->N_ifft_prach = p->N_ifft_ul * DELTA_F / DELTA_F_RA_4;
} else {
p->N_ifft_prach = p->N_ifft_ul * DELTA_F / DELTA_F_RA;
}
/* The deadzone specifies the number of samples at the end of the correlation window
@ -496,19 +489,19 @@ int srslte_prach_set_cell(srslte_prach_t *p,
p->deadzone = (uint32_t) ceil((float) samp_rate/((float) p->N_zc*subcarrier_spacing));
}*/
if(srslte_dft_replan(&p->ifft, p->N_ifft_prach)) {
if (srslte_dft_replan(&p->ifft, p->N_ifft_prach)) {
fprintf(stderr, "Error creating DFT plan\n");
return -1;
}
if(srslte_dft_replan(&p->fft, p->N_ifft_prach)){
if (srslte_dft_replan(&p->fft, p->N_ifft_prach)) {
fprintf(stderr, "Error creating DFT plan\n");
return -1;
}
p->N_seq = prach_Tseq[p->f]*p->N_ifft_ul/2048;
p->N_cp = prach_Tcp[p->f]*p->N_ifft_ul/2048;
p->T_seq = prach_Tseq[p->f]*SRSLTE_LTE_TS;
p->T_tot = (prach_Tseq[p->f]+prach_Tcp[p->f])*SRSLTE_LTE_TS;
p->N_seq = prach_Tseq[p->f] * p->N_ifft_ul / 2048;
p->N_cp = prach_Tcp[p->f] * p->N_ifft_ul / 2048;
p->T_seq = prach_Tseq[p->f] * SRSLTE_LTE_TS;
p->T_tot = (prach_Tseq[p->f] + prach_Tcp[p->f]) * SRSLTE_LTE_TS;
ret = SRSLTE_SUCCESS;
} else {
@ -521,18 +514,16 @@ int srslte_prach_set_cell(srslte_prach_t *p,
int srslte_prach_gen(srslte_prach_t *p,
uint32_t seq_index,
uint32_t freq_offset,
cf_t *signal)
{
cf_t *signal) {
int ret = SRSLTE_ERROR;
if(p != NULL &&
if (p != NULL &&
seq_index < N_SEQS &&
signal != NULL)
{
signal != NULL) {
// Calculate parameters
uint32_t N_rb_ul = srslte_nof_prb(p->N_ifft_ul);
uint32_t k_0 = freq_offset*N_RB_SC - N_rb_ul*N_RB_SC/2 + p->N_ifft_ul/2;
uint32_t K = DELTA_F/DELTA_F_RA;
uint32_t begin = PHI + (K*k_0) + (K/2);
uint32_t k_0 = freq_offset * N_RB_SC - N_rb_ul * N_RB_SC / 2 + p->N_ifft_ul / 2;
uint32_t K = DELTA_F / DELTA_F_RA;
uint32_t begin = PHI + (K * k_0) + (K / 2);
if (6 + freq_offset > N_rb_ul) {
fprintf(stderr, "Error no space for PRACH: frequency offset=%d, N_rb_ul=%d\n", freq_offset, N_rb_ul);
@ -543,18 +534,18 @@ int srslte_prach_gen(srslte_prach_t *p,
p->N_zc, p->N_cp, p->N_seq, p->N_ifft_prach, begin);
// Map dft-precoded sequence to ifft bins
memset(p->ifft_in, 0, begin*sizeof(cf_t));
memset(p->ifft_in, 0, begin * sizeof(cf_t));
memcpy(&p->ifft_in[begin], p->dft_seqs[seq_index], p->N_zc * sizeof(cf_t));
memset(&p->ifft_in[begin+p->N_zc], 0, (p->N_ifft_prach - begin - p->N_zc) * sizeof(cf_t));
memset(&p->ifft_in[begin + p->N_zc], 0, (p->N_ifft_prach - begin - p->N_zc) * sizeof(cf_t));
srslte_dft_run(&p->ifft, p->ifft_in, p->ifft_out);
// Copy CP into buffer
memcpy(signal, &p->ifft_out[p->N_ifft_prach-p->N_cp], p->N_cp*sizeof(cf_t));
memcpy(signal, &p->ifft_out[p->N_ifft_prach - p->N_cp], p->N_cp * sizeof(cf_t));
// Copy preamble sequence into buffer
for(int i=0;i<p->N_seq;i++){
signal[p->N_cp+i] = p->ifft_out[i%p->N_ifft_prach];
for (int i = 0; i < p->N_seq; i++) {
signal[p->N_cp + i] = p->ifft_out[i % p->N_ifft_prach];
}
ret = SRSLTE_SUCCESS;
@ -572,8 +563,7 @@ int srslte_prach_detect(srslte_prach_t *p,
cf_t *signal,
uint32_t sig_len,
uint32_t *indices,
uint32_t *n_indices)
{
uint32_t *n_indices) {
return srslte_prach_detect_offset(p, freq_offset, signal, sig_len, indices, NULL, NULL, n_indices);
}
@ -584,16 +574,14 @@ int srslte_prach_detect_offset(srslte_prach_t *p,
uint32_t *indices,
float *t_offsets,
float *peak_to_avg,
uint32_t *n_indices)
{
uint32_t *n_indices) {
int ret = SRSLTE_ERROR;
if(p != NULL &&
if (p != NULL &&
signal != NULL &&
sig_len > 0 &&
indices != NULL)
{
indices != NULL) {
if(sig_len < p->N_ifft_prach){
if (sig_len < p->N_ifft_prach) {
fprintf(stderr, "srslte_prach_detect: Signal length is %d and should be %d\n", sig_len, p->N_ifft_prach);
return SRSLTE_ERROR_INVALID_INPUTS;
}
@ -605,13 +593,13 @@ int srslte_prach_detect_offset(srslte_prach_t *p,
// Extract bins of interest
uint32_t N_rb_ul = srslte_nof_prb(p->N_ifft_ul);
uint32_t k_0 = freq_offset*N_RB_SC - N_rb_ul*N_RB_SC/2 + p->N_ifft_ul/2;
uint32_t K = DELTA_F/DELTA_F_RA;
uint32_t begin = PHI + (K*k_0) + (K/2);
uint32_t k_0 = freq_offset * N_RB_SC - N_rb_ul * N_RB_SC / 2 + p->N_ifft_ul / 2;
uint32_t K = DELTA_F / DELTA_F_RA;
uint32_t begin = PHI + (K * k_0) + (K / 2);
memcpy(p->prach_bins, &p->signal_fft[begin], p->N_zc*sizeof(cf_t));
memcpy(p->prach_bins, &p->signal_fft[begin], p->N_zc * sizeof(cf_t));
for(int i=0;i<p->N_roots;i++){
for (int i = 0; i < p->N_roots; i++) {
cf_t *root_spec = p->dft_seqs[p->root_seqs_idx[i]];
srslte_vec_prod_conj_ccc(p->prach_bins, root_spec, p->corr_spec, p->N_zc);
@ -620,49 +608,48 @@ int srslte_prach_detect_offset(srslte_prach_t *p,
srslte_vec_abs_square_cf(p->corr_spec, p->corr, p->N_zc);
float corr_ave = srslte_vec_acc_ff(p->corr, p->N_zc)/p->N_zc;
float corr_ave = srslte_vec_acc_ff(p->corr, p->N_zc) / p->N_zc;
uint32_t winsize = 0;
if(p->N_cs != 0){
if (p->N_cs != 0) {
winsize = p->N_cs;
}else{
} else {
winsize = p->N_zc;
}
uint32_t n_wins = p->N_zc/winsize;
uint32_t n_wins = p->N_zc / winsize;
float max_peak = 0;
for(int j=0;j<n_wins;j++) {
uint32_t start = (p->N_zc-(j*p->N_cs))%p->N_zc;
uint32_t end = start+winsize;
if (end>p->deadzone) {
end-=p->deadzone;
for (int j = 0; j < n_wins; j++) {
uint32_t start = (p->N_zc - (j * p->N_cs)) % p->N_zc;
uint32_t end = start + winsize;
if (end > p->deadzone) {
end -= p->deadzone;
}
start += p->deadzone;
p->peak_values[j] = 0;
for(int k=start;k<end;k++) {
if(p->corr[k] > p->peak_values[j]) {
for (int k = start; k < end; k++) {
if (p->corr[k] > p->peak_values[j]) {
p->peak_values[j] = p->corr[k];
p->peak_offsets[j] = k-start;
p->peak_offsets[j] = k - start;
if (p->peak_values[j] > max_peak) {
max_peak = p->peak_values[j];
}
}
}
}
if (max_peak > p->detect_factor*corr_ave) {
for (int j=0;j<n_wins;j++) {
if(p->peak_values[j] > p->detect_factor*corr_ave)
{
if (max_peak > p->detect_factor * corr_ave) {
for (int j = 0; j < n_wins; j++) {
if (p->peak_values[j] > p->detect_factor * corr_ave) {
//printf("saving prach correlation\n");
//memcpy(save_corr, p->corr, p->N_zc*sizeof(float));
if (indices) {
indices[*n_indices] = (i*n_wins)+j;
indices[*n_indices] = (i * n_wins) + j;
}
if (peak_to_avg) {
peak_to_avg[*n_indices] = p->peak_values[j]/corr_ave;
peak_to_avg[*n_indices] = p->peak_values[j] / corr_ave;
}
if (t_offsets) {
t_offsets[*n_indices] = (float) p->peak_offsets[j]*p->T_seq/p->N_zc;
t_offsets[*n_indices] = (float) p->peak_offsets[j] * p->T_seq / p->N_zc;
}
(*n_indices)++;
}
@ -695,33 +682,29 @@ int srslte_prach_free(srslte_prach_t *p) {
return 0;
}
int srslte_prach_print_seqs(srslte_prach_t *p)
{
for(int i=0; i<N_SEQS;i++)
{
int srslte_prach_print_seqs(srslte_prach_t *p) {
for (int i = 0; i < N_SEQS; i++) {
FILE *f;
char str[32];
sprintf(str, "prach_seq_%d.bin", i);
f = fopen(str, "wb");
fwrite(p->seqs[i] , sizeof(cf_t), p->N_zc, f);
fwrite(p->seqs[i], sizeof(cf_t), p->N_zc, f);
fclose(f);
}
for(int i=0; i<N_SEQS;i++)
{
for (int i = 0; i < N_SEQS; i++) {
FILE *f;
char str[32];
sprintf(str, "prach_dft_seq_%d.bin", i);
f = fopen(str, "wb");
fwrite(p->dft_seqs[i] , sizeof(cf_t), p->N_zc, f);
fwrite(p->dft_seqs[i], sizeof(cf_t), p->N_zc, f);
fclose(f);
}
for(int i=0;i<p->N_roots;i++)
{
for (int i = 0; i < p->N_roots; i++) {
FILE *f;
char str[32];
sprintf(str, "prach_root_seq_%d.bin", i);
f = fopen(str, "wb");
fwrite(p->seqs[p->root_seqs_idx[i]] , sizeof(cf_t), p->N_zc, f);
fwrite(p->seqs[p->root_seqs_idx[i]], sizeof(cf_t), p->N_zc, f);
fclose(f);
}
return 0;

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