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Merge remote-tracking branch 'origin/develop' into feature-131-new-license

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Conflicts:
	openair1/PHY/INIT/lte_init.c
	openair1/PHY/LTE_TRANSPORT/dci_tools.c
	openair1/PHY/LTE_TRANSPORT/ulsch_decoding.c
	openair1/SCHED/phy_procedures_lte_eNb.c
	openair1/SCHED/phy_procedures_lte_ue.c
	openair1/SIMULATION/LTE_PHY/dlsim.c
	openair1/SIMULATION/RF/adc.c
	openair2/LAYER2/MAC/lte_transport_init.c
	targets/RT/USER/lte-softmodem.c
	targets/RT/USER/sched_dlsch.c
	targets/RT/USER/sched_rx_pdsch.c
	targets/RT/USER/sched_ulsch.c
	targets/SIMU/USER/oaisim.c
This commit is contained in:
Cedric Roux
2016-09-27 15:05:00 +02:00
parent f06dd02fe8 e08e2577f5
commit 7a724e7d2e
200 changed files with 22970 additions and 19972 deletions
Download Patch File Download Diff File Expand all files Collapse all files
openair1/PHY/LTE_REFSIG/lte_dl_cell_spec.c
+23 -23
View File
@@ -12,7 +12,7 @@
//Calibration
int lte_dl_cell_spec_SS(PHY_VARS_eNB *phy_vars_eNB,
int lte_dl_cell_spec_SS(PHY_VARS_eNB *eNB,
int32_t *output,
short amp,
unsigned char Ns,
@@ -48,27 +48,27 @@ int lte_dl_cell_spec_SS(PHY_VARS_eNB *phy_vars_eNB,
return(-1);
}
mprime = 110 - phy_vars_eNB->lte_frame_parms.N_RB_DL;
mprime = 110 - eNB->frame_parms.N_RB_DL;
k = (nu + phy_vars_eNB->lte_frame_parms.nushift);
k = (nu + eNB->frame_parms.nushift);
if (k > 6)//b
k -=6;//b
k+=phy_vars_eNB->lte_frame_parms.first_carrier_offset;
k+=eNB->frame_parms.first_carrier_offset;
for (m=0; m<phy_vars_eNB->lte_frame_parms.N_RB_DL<<1; m++) { // loop over pilots in one slot/symbol, 2*N_RB_DL pilots
for (m=0; m<eNB->frame_parms.N_RB_DL<<1; m++) { // loop over pilots in one slot/symbol, 2*N_RB_DL pilots
mprime_dword = mprime>>4;
mprime_qpsk_symb = mprime&0xf;
// this is r_mprime from 3GPP 36-211 6.10.1.2
output[k] = qpsk[(phy_vars_eNB->lte_gold_table[Ns][l][mprime_dword]>>(2*mprime_qpsk_symb))&3];
output[k] = qpsk[(eNB->lte_gold_table[Ns][l][mprime_dword]>>(2*mprime_qpsk_symb))&3];
//output[k] = (lte_gold_table[eNB_offset][Ns][l][mprime_dword]>>(2*mprime_qpsk_symb))&3;
#ifdef DEBUG_DL_CELL_SPEC
printf("Ns %d, l %d, m %d,mprime_dword %d, mprime_qpsk_symbol %d\n",
Ns,l,m,mprime_dword,mprime_qpsk_symb);
printf("index = %d (k %d)\n",(phy_vars_eNB->lte_gold_table[Ns][l][mprime_dword]>>(2*mprime_qpsk_symb))&3,k);
printf("index = %d (k %d)\n",(eNB->lte_gold_table[Ns][l][mprime_dword]>>(2*mprime_qpsk_symb))&3,k);
#endif
mprime++;
@@ -80,9 +80,9 @@ int lte_dl_cell_spec_SS(PHY_VARS_eNB *phy_vars_eNB,
#endif
k+=6;//b
if (k >= phy_vars_eNB->lte_frame_parms.ofdm_symbol_size) {
if (k >= eNB->frame_parms.ofdm_symbol_size) {
k++; // skip DC carrier
k-=phy_vars_eNB->lte_frame_parms.ofdm_symbol_size;
k-=eNB->frame_parms.ofdm_symbol_size;
}
// printf("** k %d\n",k);
@@ -92,7 +92,7 @@ int lte_dl_cell_spec_SS(PHY_VARS_eNB *phy_vars_eNB,
}
int lte_dl_cell_spec(PHY_VARS_eNB *phy_vars_eNB,
int lte_dl_cell_spec(PHY_VARS_eNB *eNB,
int32_t *output,
short amp,
unsigned char Ns,
@@ -127,31 +127,31 @@ int lte_dl_cell_spec(PHY_VARS_eNB *phy_vars_eNB,
return(-1);
}
mprime = 110 - phy_vars_eNB->lte_frame_parms.N_RB_DL;
mprime = 110 - eNB->frame_parms.N_RB_DL;
k = (nu + phy_vars_eNB->lte_frame_parms.nushift);
k = (nu + eNB->frame_parms.nushift);
if (k > 5)
k -=6;
k+=phy_vars_eNB->lte_frame_parms.first_carrier_offset;
k+=eNB->frame_parms.first_carrier_offset;
DevAssert( Ns < 20 );
DevAssert( l < 2 );
DevAssert( mprime>>4 < 14 );
for (m=0; m<phy_vars_eNB->lte_frame_parms.N_RB_DL<<1; m++) {
for (m=0; m<eNB->frame_parms.N_RB_DL<<1; m++) {
mprime_dword = mprime>>4;
mprime_qpsk_symb = mprime&0xf;
// this is r_mprime from 3GPP 36-211 6.10.1.2
output[k] = qpsk[(phy_vars_eNB->lte_gold_table[Ns][l][mprime_dword]>>(2*mprime_qpsk_symb))&3];
output[k] = qpsk[(eNB->lte_gold_table[Ns][l][mprime_dword]>>(2*mprime_qpsk_symb))&3];
//output[k] = (lte_gold_table[eNB_offset][Ns][l][mprime_dword]>>(2*mprime_qpsk_symb))&3;
#ifdef DEBUG_DL_CELL_SPEC
printf("Ns %d, l %d, m %d,mprime_dword %d, mprime_qpsk_symbol %d\n",
Ns,l,m,mprime_dword,mprime_qpsk_symb);
printf("index = %d (k %d)\n",(phy_vars_eNB->lte_gold_table[Ns][l][mprime_dword]>>(2*mprime_qpsk_symb))&3,k);
printf("index = %d (k %d)\n",(eNB->lte_gold_table[Ns][l][mprime_dword]>>(2*mprime_qpsk_symb))&3,k);
#endif
mprime++;
@@ -163,9 +163,9 @@ int lte_dl_cell_spec(PHY_VARS_eNB *phy_vars_eNB,
#endif
k+=6;
if (k >= phy_vars_eNB->lte_frame_parms.ofdm_symbol_size) {
if (k >= eNB->frame_parms.ofdm_symbol_size) {
k++; // skip DC carrier
k-=phy_vars_eNB->lte_frame_parms.ofdm_symbol_size;
k-=eNB->frame_parms.ofdm_symbol_size;
}
// printf("** k %d\n",k);
@@ -174,7 +174,7 @@ int lte_dl_cell_spec(PHY_VARS_eNB *phy_vars_eNB,
return(0);
}
int lte_dl_cell_spec_rx(PHY_VARS_UE *phy_vars_ue,
int lte_dl_cell_spec_rx(PHY_VARS_UE *ue,
uint8_t eNB_offset,
int *output,
unsigned char Ns,
@@ -202,19 +202,19 @@ int lte_dl_cell_spec_rx(PHY_VARS_UE *phy_vars_ue,
((short *)&qpsk[3])[0] = -pamp;
((short *)&qpsk[3])[1] = pamp;
mprime = 110 - phy_vars_ue->lte_frame_parms.N_RB_DL;
mprime = 110 - ue->frame_parms.N_RB_DL;
for (m=0; m<phy_vars_ue->lte_frame_parms.N_RB_DL<<1; m++) {
for (m=0; m<ue->frame_parms.N_RB_DL<<1; m++) {
mprime_dword = mprime>>4;
mprime_qpsk_symb = mprime&0xf;
// this is r_mprime from 3GPP 36-211 6.10.1.2
output[k] = qpsk[(phy_vars_ue->lte_gold_table[eNB_offset][Ns][l][mprime_dword]>>(2*mprime_qpsk_symb))&3];
output[k] = qpsk[(ue->lte_gold_table[eNB_offset][Ns][l][mprime_dword]>>(2*mprime_qpsk_symb))&3];
#ifdef DEBUG_DL_CELL_SPEC
printf("Ns %d, l %d, m %d,mprime_dword %d, mprime_qpsk_symbol %d\n",
Ns,l,m,mprime_dword,mprime_qpsk_symb);
printf("index = %d (k %d)\n",(phy_vars_ue->lte_gold_table[eNB_offset][Ns][l][mprime_dword]>>(2*mprime_qpsk_symb))&3,k);
printf("index = %d (k %d)\n",(ue->lte_gold_table[eNB_offset][Ns][l][mprime_dword]>>(2*mprime_qpsk_symb))&3,k);
#endif
mprime++;
openair1/PHY/LTE_REFSIG/lte_dl_mbsfn.c
+13 -13
View File
@@ -11,7 +11,7 @@
//extern unsigned int lte_gold_table[10][3][42];
//#define DEBUG_DL_MBSFN
int lte_dl_mbsfn(PHY_VARS_eNB *phy_vars_eNB, int32_t *output,
int lte_dl_mbsfn(PHY_VARS_eNB *eNB, int32_t *output,
short amp,
int subframe,
unsigned char l)
@@ -34,9 +34,9 @@ int lte_dl_mbsfn(PHY_VARS_eNB *phy_vars_eNB, int32_t *output,
((short *)&qpsk[3])[1] = -a;
mprime = 3*(110 - phy_vars_eNB->lte_frame_parms.N_RB_DL);
mprime = 3*(110 - eNB->frame_parms.N_RB_DL);
for (m=0; m<phy_vars_eNB->lte_frame_parms.N_RB_DL*6; m++) {
for (m=0; m<eNB->frame_parms.N_RB_DL*6; m++) {
if ((l==0) || (l==2))
k = m<<1;
@@ -47,24 +47,24 @@ int lte_dl_mbsfn(PHY_VARS_eNB *phy_vars_eNB, int32_t *output,
return(-1);
}
k+=phy_vars_eNB->lte_frame_parms.first_carrier_offset;
k+=eNB->frame_parms.first_carrier_offset;
mprime_dword = mprime>>4;
mprime_qpsk_symb = mprime&0xf;
if (k >= phy_vars_eNB->lte_frame_parms.ofdm_symbol_size) {
if (k >= eNB->frame_parms.ofdm_symbol_size) {
k++; // skip DC carrier
k-=phy_vars_eNB->lte_frame_parms.ofdm_symbol_size;
k-=eNB->frame_parms.ofdm_symbol_size;
}
output[k] = qpsk[(phy_vars_eNB->lte_gold_mbsfn_table[subframe][l][mprime_dword]>>(2*mprime_qpsk_symb))&3];
output[k] = qpsk[(eNB->lte_gold_mbsfn_table[subframe][l][mprime_dword]>>(2*mprime_qpsk_symb))&3];
//output[k] = (lte_gold_table[eNB_offset][subframe][l][mprime_dword]>>(2*mprime_qpsk_symb))&3;
#ifdef DEBUG_DL_MBSFN
msg("subframe %d, l %d, m %d, mprime %d, mprime_dword %d, mprime_qpsk_symbol %d\n",
subframe,l,m,mprime,mprime_dword,mprime_qpsk_symb);
msg("index = %d (k %d)(%x)\n",(phy_vars_eNB->lte_gold_mbsfn_table[subframe][l][mprime_dword]>>(2*mprime_qpsk_symb))&3,k,phy_vars_eNB->lte_gold_mbsfn_table[subframe][l][mprime_dword]);
msg("index = %d (k %d)(%x)\n",(eNB->lte_gold_mbsfn_table[subframe][l][mprime_dword]>>(2*mprime_qpsk_symb))&3,k,eNB->lte_gold_mbsfn_table[subframe][l][mprime_dword]);
#endif
mprime++;
@@ -82,7 +82,7 @@ int lte_dl_mbsfn(PHY_VARS_eNB *phy_vars_eNB, int32_t *output,
int lte_dl_mbsfn_rx(PHY_VARS_UE *phy_vars_ue,
int lte_dl_mbsfn_rx(PHY_VARS_UE *ue,
int *output,
int subframe,
unsigned char l)
@@ -103,20 +103,20 @@ int lte_dl_mbsfn_rx(PHY_VARS_UE *phy_vars_ue,
((short *)&qpsk[3])[0] = -ONE_OVER_SQRT2_Q15;
((short *)&qpsk[3])[1] = ONE_OVER_SQRT2_Q15;
mprime = 3*(110 - phy_vars_ue->lte_frame_parms.N_RB_DL);
mprime = 3*(110 - ue->frame_parms.N_RB_DL);
for (m=0; m<phy_vars_ue->lte_frame_parms.N_RB_DL*6; m++) {
for (m=0; m<ue->frame_parms.N_RB_DL*6; m++) {
mprime_dword = mprime>>4;
mprime_qpsk_symb = mprime&0xf;
// this is r_mprime from 3GPP 36-211 6.10.1.2
output[k] = qpsk[(phy_vars_ue->lte_gold_mbsfn_table[subframe][l][mprime_dword]>>(2*mprime_qpsk_symb))&3];
output[k] = qpsk[(ue->lte_gold_mbsfn_table[subframe][l][mprime_dword]>>(2*mprime_qpsk_symb))&3];
#ifdef DEBUG_DL_MBSFN
printf("subframe %d, l %d, m %d, mprime %d, mprime_dword %d, mprime_qpsk_symbol %d\n",
subframe,l,m,mprime, mprime_dword,mprime_qpsk_symb);
printf("index = %d (k %d) (%x)\n",(phy_vars_ue->lte_gold_mbsfn_table[subframe][l][mprime_dword]>>(2*mprime_qpsk_symb))&3,k,phy_vars_ue->lte_gold_mbsfn_table[subframe][l][mprime_dword]);
printf("index = %d (k %d) (%x)\n",(ue->lte_gold_mbsfn_table[subframe][l][mprime_dword]>>(2*mprime_qpsk_symb))&3,k,ue->lte_gold_mbsfn_table[subframe][l][mprime_dword]);
#endif
mprime++;
openair1/PHY/LTE_REFSIG/lte_dl_uespec.c
+20 -20
View File
@@ -23,7 +23,7 @@
int Wbar_NCP[8][4] = {{1,1,1,1},{1,-1,1,-1},{1,1,1,1},{1,-1,1,-1},{1,1,-1,-1},{-1,-1,1,1},{1,-1,-1,1},{-1,1,1,-1}};
int lte_dl_ue_spec(PHY_VARS_eNB *phy_vars_eNB,
int lte_dl_ue_spec(PHY_VARS_eNB *eNB,
uint8_t UE_id,
int32_t *output,
short amp,
@@ -35,7 +35,7 @@ int lte_dl_ue_spec(PHY_VARS_eNB *phy_vars_eNB,
int32_t qpsk[4],nqpsk[4],*qpsk_p,*output_p;
int16_t a;
int w,lprime,ind,l,ind_dword,ind_qpsk_symb,nPRB;
// LTE_eNB_DLSCH_t *dlsch = phy_vars_eNB->dlsch_eNB[UE_id][0];
// LTE_eNB_DLSCH_t *dlsch = eNB->dlsch_eNB[UE_id][0];
a = (amp*ONE_OVER_SQRT2_Q15)>>15;
((short *)&qpsk[0])[0] = a;
@@ -58,13 +58,13 @@ int lte_dl_ue_spec(PHY_VARS_eNB *phy_vars_eNB,
if (p>=7) {
if (SS_flag==0) {
if (phy_vars_eNB->lte_frame_parms.Ncp == NORMAL) {
if (eNB->frame_parms.Ncp == NORMAL) {
// this is 3GPP 36-211 6.10.3.2, NORMAL CP, p>=7
// position output pointer to 5th symbol in slot
output_p = output+(60*phy_vars_eNB->lte_frame_parms.N_RB_DL);
output_p = output+(60*eNB->frame_parms.N_RB_DL);
// shift to 2nd RE in PRB for p=7,8,11,13
if ((p==7) || (p==8) || (p==11) || (p==13)) output_p++;
@@ -72,12 +72,12 @@ int lte_dl_ue_spec(PHY_VARS_eNB *phy_vars_eNB,
for (lprime=0; lprime<2; lprime++) {
ind = 3*lprime*phy_vars_eNB->lte_frame_parms.N_RB_DL;
ind = 3*lprime*eNB->frame_parms.N_RB_DL;
l = lprime + ((Ns&1)<<1);
// loop over pairs of PRBs, this is the periodicity of the W_bar_NCP sequence
// unroll the computations for the 6 pilots, select qpsk or nqpsk as function of W_bar_NCP
for (nPRB=0; nPRB<phy_vars_eNB->lte_frame_parms.N_RB_DL; nPRB+=2) {
for (nPRB=0; nPRB<eNB->frame_parms.N_RB_DL; nPRB+=2) {
// First pilot
w = Wbar_NCP[p-7][l];
@@ -87,13 +87,13 @@ int lte_dl_ue_spec(PHY_VARS_eNB *phy_vars_eNB,
ind_dword = ind>>4;
ind_qpsk_symb = ind&0xf;
*output_p = qpsk_p[(phy_vars_eNB->lte_gold_uespec_table[0][Ns][lprime][ind_dword]>>(2*ind_qpsk_symb))&3];
*output_p = qpsk_p[(eNB->lte_gold_uespec_table[0][Ns][lprime][ind_dword]>>(2*ind_qpsk_symb))&3];
#ifdef DEBUG_DL_UESPEC
LOG_D(PHY,"Ns %d, l %d, m %d,ind_dword %d, ind_qpsk_symbol %d\n",
Ns,l,m,mprime_dword,mprime_qpsk_symb);
LOG_D(PHY,"index = %d\n",(phy_vars_eNB->lte_gold_uespec_table[0][Ns][lprime][ind_dword]>>(2*ind_qpsk_symb))&3);
LOG_D(PHY,"index = %d\n",(eNB->lte_gold_uespec_table[0][Ns][lprime][ind_dword]>>(2*ind_qpsk_symb))&3);
#endif
output_p+=5;
@@ -106,12 +106,12 @@ int lte_dl_ue_spec(PHY_VARS_eNB *phy_vars_eNB,
ind_dword = ind>>4;
ind_qpsk_symb = ind&0xf;
*output_p = qpsk_p[(phy_vars_eNB->lte_gold_uespec_table[0][Ns][lprime][ind_dword]>>(2*ind_qpsk_symb))&3];
*output_p = qpsk_p[(eNB->lte_gold_uespec_table[0][Ns][lprime][ind_dword]>>(2*ind_qpsk_symb))&3];
#ifdef DEBUG_DL_UESPEC
LOG_D(PHY,"Ns %d, l %d, m %d,ind_dword %d, ind_qpsk_symbol %d\n",
Ns,l,m,mprime_dword,mprime_qpsk_symb);
LOG_D(PHY,"index = %d\n",(phy_vars_eNB->lte_gold_uespec_table[0][Ns][lprime][ind_dword]>>(2*ind_qpsk_symb))&3);
LOG_D(PHY,"index = %d\n",(eNB->lte_gold_uespec_table[0][Ns][lprime][ind_dword]>>(2*ind_qpsk_symb))&3);
#endif
output_p+=5;
@@ -123,12 +123,12 @@ int lte_dl_ue_spec(PHY_VARS_eNB *phy_vars_eNB,
ind_dword = ind>>4;
ind_qpsk_symb = ind&0xf;
*output_p = qpsk_p[(phy_vars_eNB->lte_gold_uespec_table[0][Ns][lprime][ind_dword]>>(2*ind_qpsk_symb))&3];
*output_p = qpsk_p[(eNB->lte_gold_uespec_table[0][Ns][lprime][ind_dword]>>(2*ind_qpsk_symb))&3];
#ifdef DEBUG_DL_UESPEC
LOG_D(PHY,"Ns %d, l %d, m %d,ind_dword %d, ind_qpsk_symbol %d\n",
Ns,l,m,mprime_dword,mprime_qpsk_symb);
LOG_D(PHY,"index = %d\n",(phy_vars_eNB->lte_gold_uespec_table[0][Ns][lprime][ind_dword]>>(2*ind_qpsk_symb))&3);
LOG_D(PHY,"index = %d\n",(eNB->lte_gold_uespec_table[0][Ns][lprime][ind_dword]>>(2*ind_qpsk_symb))&3);
#endif
output_p+=2;
@@ -142,13 +142,13 @@ int lte_dl_ue_spec(PHY_VARS_eNB *phy_vars_eNB,
ind_dword = ind>>4;
ind_qpsk_symb = ind&0xf;
*output_p = qpsk_p[(phy_vars_eNB->lte_gold_uespec_table[0][Ns][lprime][ind_dword]>>(2*ind_qpsk_symb))&3];
*output_p = qpsk_p[(eNB->lte_gold_uespec_table[0][Ns][lprime][ind_dword]>>(2*ind_qpsk_symb))&3];
#ifdef DEBUG_DL_UESPEC
LOG_D(PHY,"Ns %d, l %d, m %d,ind_dword %d, ind_qpsk_symbol %d\n",
Ns,l,m,mprime_dword,mprime_qpsk_symb);
LOG_D(PHY,"index = %d\n",(phy_vars_eNB->lte_gold_uespec_table[0][Ns][lprime][ind_dword]>>(2*ind_qpsk_symb))&3);
LOG_D(PHY,"index = %d\n",(eNB->lte_gold_uespec_table[0][Ns][lprime][ind_dword]>>(2*ind_qpsk_symb))&3);
#endif
output_p+=5;
@@ -161,12 +161,12 @@ int lte_dl_ue_spec(PHY_VARS_eNB *phy_vars_eNB,
ind_dword = ind>>4;
ind_qpsk_symb = ind&0xf;
*output_p = qpsk_p[(phy_vars_eNB->lte_gold_uespec_table[0][Ns][lprime][ind_dword]>>(2*ind_qpsk_symb))&3];
*output_p = qpsk_p[(eNB->lte_gold_uespec_table[0][Ns][lprime][ind_dword]>>(2*ind_qpsk_symb))&3];
#ifdef DEBUG_DL_UESPEC
LOG_D(PHY,"Ns %d, l %d, m %d,ind_dword %d, ind_qpsk_symbol %d\n",
Ns,l,m,mprime_dword,mprime_qpsk_symb);
LOG_D(PHY,"index = %d\n",(phy_vars_eNB->lte_gold_uespec_table[0][Ns][lprime][ind_dword]>>(2*ind_qpsk_symb))&3);
LOG_D(PHY,"index = %d\n",(eNB->lte_gold_uespec_table[0][Ns][lprime][ind_dword]>>(2*ind_qpsk_symb))&3);
#endif
output_p+=5;
@@ -178,12 +178,12 @@ int lte_dl_ue_spec(PHY_VARS_eNB *phy_vars_eNB,
ind_dword = ind>>4;
ind_qpsk_symb = ind&0xf;
*output_p = qpsk_p[(phy_vars_eNB->lte_gold_uespec_table[0][Ns][lprime][ind_dword]>>(2*ind_qpsk_symb))&3];
*output_p = qpsk_p[(eNB->lte_gold_uespec_table[0][Ns][lprime][ind_dword]>>(2*ind_qpsk_symb))&3];
#ifdef DEBUG_DL_UESPEC
LOG_D(PHY,"Ns %d, l %d, m %d,ind_dword %d, ind_qpsk_symbol %d\n",
Ns,l,m,mprime_dword,mprime_qpsk_symb);
LOG_D(PHY,"index = %d\n",(phy_vars_eNB->lte_gold_uespec_table[0][Ns][lprime][ind_dword]>>(2*ind_qpsk_symb))&3);
LOG_D(PHY,"index = %d\n",(eNB->lte_gold_uespec_table[0][Ns][lprime][ind_dword]>>(2*ind_qpsk_symb))&3);
#endif
output_p+=2;
@@ -231,9 +231,9 @@ int lte_dl_cell_spec_rx(PHY_VARS_UE *phy_vars_ue,
((short *)&qpsk[3])[0] = -pamp;
((short *)&qpsk[3])[1] = pamp;
mprime = 110 - phy_vars_ue->lte_frame_parms.N_RB_DL;
mprime = 110 - phy_vars_ue->frame_parms.N_RB_DL;
for (m=0;m<phy_vars_ue->lte_frame_parms.N_RB_DL<<1;m++) {
for (m=0;m<phy_vars_ue->frame_parms.N_RB_DL<<1;m++) {
mprime_dword = mprime>>4;
mprime_qpsk_symb = mprime&0xf;