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Commit c5734aa1 authored by Thomas Schlichter's avatar Thomas Schlichter
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NR_UE: slightly cleanup PRACH generation

parent 92e654c6
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Showing with 66 additions and 87 deletions
openair1/PHY/NR_UE_TRANSPORT/nr_prach.c
View file @ c5734aa1
...@@ -244,85 +244,57 @@ int32_t generate_nr_prach(PHY_VARS_NR_UE *ue, uint8_t gNB_id, uint8_t slot){ ...@@ -244,85 +244,57 @@ int32_t generate_nr_prach(PHY_VARS_NR_UE *ue, uint8_t gNB_id, uint8_t slot){
*********************************************************/ *********************************************************/
if (mu==1) { if (mu==1) {
if (fp->N_RB_UL <= 100) switch(fp->samples_per_subframe) {
AssertFatal(1 == 0, "N_RB_UL %d not support for NR PRACH yet\n", fp->N_RB_UL); case 46080:
else if (fp->N_RB_UL < 137) {
if (fp->threequarter_fs == 0) {
//40 MHz @ 61.44 Ms/s
//50 MHz @ 61.44 Ms/s
if (prach_sequence_length == 0) {
if (prach_fmt_id == 0 || prach_fmt_id == 1 || prach_fmt_id == 2)
dftlen = 49152;
if (prach_fmt_id == 3)
dftlen = 12288;
} // 839 sequence
else {
switch (mu){
case 1:
dftlen = 2048;
break;
default:
AssertFatal(1 == 0, "Shouldn't get here\n");
break;
}
}
} else { // threequarter sampling
// 40 MHz @ 46.08 Ms/s // 40 MHz @ 46.08 Ms/s
if (prach_sequence_length == 0) { if (prach_sequence_length == 0) {
AssertFatal(fp->N_RB_UL <= 107, "cannot do 108..136 PRBs with 3/4 sampling\n");
if (prach_fmt_id == 0 || prach_fmt_id == 1 || prach_fmt_id == 2) if (prach_fmt_id == 0 || prach_fmt_id == 1 || prach_fmt_id == 2)
dftlen = 36864; dftlen = 36864;
if (prach_fmt_id == 3) if (prach_fmt_id == 3)
dftlen = 9216; dftlen = 9216;
} else { } else { // 839 sequence
switch (mu){
case 1:
dftlen = 1536; dftlen = 1536;
break;
default:
AssertFatal(1 == 0, "Shouldn't get here\n");
break;
} }
} // short format break;
} // 3/4 sampling
} // <=50 MHz BW case 61440:
else if (fp->N_RB_UL <= 273) { // 40, 50, 60 MHz @ 61.44 Ms/s
if (fp->threequarter_fs == 0) {
//80,90,100 MHz @ 122.88 Ms/s
if (prach_sequence_length == 0) { if (prach_sequence_length == 0) {
if (prach_fmt_id == 0 || prach_fmt_id == 1 || prach_fmt_id == 2) if (prach_fmt_id == 0 || prach_fmt_id == 1 || prach_fmt_id == 2)
dftlen = 98304; dftlen = 49152;
if (prach_fmt_id == 3) if (prach_fmt_id == 3)
dftlen = 24576; dftlen = 12288;
} else { // 839 sequence
dftlen = 2048;
} }
} else { // threequarter sampling
switch (mu){
case 1:
dftlen = 4096;
break; break;
default:
AssertFatal(1 == 0, "Shouldn't get here\n"); case 92160:
break; // 50, 60, 70, 80, 90 MHz @ 92.16 Ms/s
}
}
} else {
AssertFatal(fp->N_RB_UL <= 217, "cannot do more than 217 PRBs with 3/4 sampling\n");
// 80 MHz @ 92.16 Ms/s
if (prach_sequence_length == 0) { if (prach_sequence_length == 0) {
if (prach_fmt_id == 0 || prach_fmt_id == 1 || prach_fmt_id == 2) if (prach_fmt_id == 0 || prach_fmt_id == 1 || prach_fmt_id == 2)
dftlen = 73728; dftlen = 73728;
if (prach_fmt_id == 3) if (prach_fmt_id == 3)
dftlen = 18432; dftlen = 18432;
} else { } else { // 839 sequence
switch (mu){
case 1:
dftlen = 3072; dftlen = 3072;
break;
default:
AssertFatal(1 == 0, "Shouldn't get here\n");
break;
} }
break;
case 122880:
// 70, 80, 90, 100 MHz @ 122.88 Ms/s
if (prach_sequence_length == 0) {
if (prach_fmt_id == 0 || prach_fmt_id == 1 || prach_fmt_id == 2)
dftlen = 98304;
if (prach_fmt_id == 3)
dftlen = 24576;
} else { // 839 sequence
dftlen = 4096;
} }
break;
default:
AssertFatal(1==0,"sample rate %f MHz not supported for numerology %d\n", fp->samples_per_subframe / 1000.0, mu);
} }
} }
else if (mu==3) { else if (mu==3) {
...@@ -432,8 +404,9 @@ int32_t generate_nr_prach(PHY_VARS_NR_UE *ue, uint8_t gNB_id, uint8_t slot){ ...@@ -432,8 +404,9 @@ int32_t generate_nr_prach(PHY_VARS_NR_UE *ue, uint8_t gNB_id, uint8_t slot){
use_extended_prach_prefix = 1; use_extended_prach_prefix = 1;
} }
if (fp->N_RB_UL <= 34) { //32 PRB case 61.44Msps if (mu == 3) {
if (fp->threequarter_fs == 0) { switch (fp->samples_per_subframe) {
case 61440: // 32 PRB case, 61.44 Msps
Ncp<<=1; //to account for 61.44Mbps Ncp<<=1; //to account for 61.44Mbps
// This is after cyclic prefix // This is after cyclic prefix
prach2 = prach+(Ncp<<1); //times 2 for complex samples prach2 = prach+(Ncp<<1); //times 2 for complex samples
...@@ -491,13 +464,9 @@ int32_t generate_nr_prach(PHY_VARS_NR_UE *ue, uint8_t gNB_id, uint8_t slot){ ...@@ -491,13 +464,9 @@ int32_t generate_nr_prach(PHY_VARS_NR_UE *ue, uint8_t gNB_id, uint8_t slot){
prach_len = (512*12)+Ncp; prach_len = (512*12)+Ncp;
} }
} }
} break;
else
AssertFatal(1==0,"3/4 sampling not supported for this PRACH size %d\n",fp->N_RB_UL);
} case 122880: // 66 PRB case, 122.88 Msps
else if (fp->N_RB_UL <= 68) {//66 PRB case, 122.88 Msps
if (fp->threequarter_fs == 0) {
Ncp<<=2; //to account for 122.88Mbps Ncp<<=2; //to account for 122.88Mbps
// This is after cyclic prefix // This is after cyclic prefix
prach2 = prach+(Ncp<<1); //times 2 for complex samples prach2 = prach+(Ncp<<1); //times 2 for complex samples
...@@ -555,13 +524,15 @@ int32_t generate_nr_prach(PHY_VARS_NR_UE *ue, uint8_t gNB_id, uint8_t slot){ ...@@ -555,13 +524,15 @@ int32_t generate_nr_prach(PHY_VARS_NR_UE *ue, uint8_t gNB_id, uint8_t slot){
prach_len = (1024*12)+Ncp; prach_len = (1024*12)+Ncp;
} }
} }
break;
default:
AssertFatal(1==0,"sample rate %f MHz not supported for numerology %d\n", fp->samples_per_subframe / 1000.0, mu);
} }
else } else if (mu == 1) {
AssertFatal(1==0,"3/4 sampling not supported for this PRACH size %d\n",fp->N_RB_UL); switch (fp->samples_per_subframe) {
} case 61440: // full sampling @ 61.44 Ms/s
else if (fp->N_RB_UL < 137) { // 46.08 or 61.44 Ms/s Ncp = Ncp*2; // to account for 61.44 Ms/s
if (fp->threequarter_fs == 0) { // full sampling @ 61.44 Ms/s
Ncp<<=1; //to account for 61.44Mbps
// This is after cyclic prefix // This is after cyclic prefix
prach2 = prach+(Ncp<<1); //times 2 for complex samples prach2 = prach+(Ncp<<1); //times 2 for complex samples
if (prach_sequence_length == 0){ if (prach_sequence_length == 0){
...@@ -587,7 +558,7 @@ int32_t generate_nr_prach(PHY_VARS_NR_UE *ue, uint8_t gNB_id, uint8_t slot){ ...@@ -587,7 +558,7 @@ int32_t generate_nr_prach(PHY_VARS_NR_UE *ue, uint8_t gNB_id, uint8_t slot){
memmove(prach,prach+(49152<<3),(Ncp<<2)); memmove(prach,prach+(49152<<3),(Ncp<<2));
// here we have |Prefix | Prach49152 | Prach49152| Prach49152 | Prach49152 // here we have |Prefix | Prach49152 | Prach49152| Prach49152 | Prach49152
prach_len = (49152*4)+Ncp; prach_len = (49152*4)+Ncp;
} else if (prach_fmt_id == 3) { // //6144 samples @ 30.72 Ms/s, 12288 samples @ 61.44 Ms/s } else if (prach_fmt_id == 3) { // 6144 samples @ 30.72 Ms/s, 12288 samples @ 61.44 Ms/s
idft(IDFT_12288,prachF,prach2,1); idft(IDFT_12288,prachF,prach2,1);
memmove(prach2+(12288<<1),prach2,(12288<<2)); memmove(prach2+(12288<<1),prach2,(12288<<2));
// here we have |empty | Prach12288 | Prach12288| empty12288 | empty12288 // here we have |empty | Prach12288 | Prach12288| empty12288 | empty12288
...@@ -649,7 +620,9 @@ int32_t generate_nr_prach(PHY_VARS_NR_UE *ue, uint8_t gNB_id, uint8_t slot){ ...@@ -649,7 +620,9 @@ int32_t generate_nr_prach(PHY_VARS_NR_UE *ue, uint8_t gNB_id, uint8_t slot){
prach_len = (2048*12)+Ncp; prach_len = (2048*12)+Ncp;
} }
} }
} else { // threequarter sampling @ 46.08 Ms/s break;
case 46080: // threequarter sampling @ 46.08 Ms/s
Ncp = (Ncp*3)/2; Ncp = (Ncp*3)/2;
prach2 = prach+(Ncp<<1); prach2 = prach+(Ncp<<1);
if (prach_sequence_length == 0){ if (prach_sequence_length == 0){
...@@ -738,9 +711,9 @@ int32_t generate_nr_prach(PHY_VARS_NR_UE *ue, uint8_t gNB_id, uint8_t slot){ ...@@ -738,9 +711,9 @@ int32_t generate_nr_prach(PHY_VARS_NR_UE *ue, uint8_t gNB_id, uint8_t slot){
prach_len = (1536*12)+Ncp; prach_len = (1536*12)+Ncp;
} }
} }
} break;
} else if (fp->N_RB_UL <= 273) {// 92.16 or 122.88 Ms/s
if (fp->threequarter_fs == 0) { // full sampling @ 122.88 Ms/s case 122880: // full sampling @ 122.88 Ms/s
Ncp<<=2; //to account for 122.88Mbps Ncp<<=2; //to account for 122.88Mbps
// This is after cyclic prefix // This is after cyclic prefix
prach2 = prach+(Ncp<<1); //times 2 for complex samples prach2 = prach+(Ncp<<1); //times 2 for complex samples
...@@ -828,7 +801,9 @@ int32_t generate_nr_prach(PHY_VARS_NR_UE *ue, uint8_t gNB_id, uint8_t slot){ ...@@ -828,7 +801,9 @@ int32_t generate_nr_prach(PHY_VARS_NR_UE *ue, uint8_t gNB_id, uint8_t slot){
prach_len = (4096*12)+Ncp; prach_len = (4096*12)+Ncp;
} }
} }
} else { // three quarter sampling @ 92.16 Ms/s break;
case 92160: // three quarter sampling @ 92.16 Ms/s
Ncp = (Ncp*3); //to account for 92.16 Msps Ncp = (Ncp*3); //to account for 92.16 Msps
prach2 = prach+(Ncp<<1); //times 2 for complex samples prach2 = prach+(Ncp<<1); //times 2 for complex samples
if (prach_sequence_length == 0){ if (prach_sequence_length == 0){
...@@ -915,6 +890,10 @@ int32_t generate_nr_prach(PHY_VARS_NR_UE *ue, uint8_t gNB_id, uint8_t slot){ ...@@ -915,6 +890,10 @@ int32_t generate_nr_prach(PHY_VARS_NR_UE *ue, uint8_t gNB_id, uint8_t slot){
prach_len = (3072*12)+Ncp; prach_len = (3072*12)+Ncp;
} }
} }
break;
default:
AssertFatal(1==0,"sample rate %f MHz not supported for numerology %d\n", fp->samples_per_subframe / 1000.0, mu);
} }
} }
......
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