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openair1/PHY/LTE_REFSIG/lte_dl_uespec.c 0 → 100644
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/*******************************************************************************
OpenAirInterface
Copyright(c) 1999 - 2014 Eurecom
OpenAirInterface is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
OpenAirInterface is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with OpenAirInterface.The full GNU General Public License is
included in this distribution in the file called "COPYING". If not,
see <http://www.gnu.org/licenses/>.
Contact Information
OpenAirInterface Admin: openair_admin@eurecom.fr
OpenAirInterface Tech : openair_tech@eurecom.fr
OpenAirInterface Dev : openair4g-devel@eurecom.fr
Address : Eurecom, Campus SophiaTech, 450 Route des Chappes, CS 50193 - 06904 Biot Sophia Antipolis cedex, FRANCE
*******************************************************************************/
/*! \file PHY/LTE_REFSIG/lte_dl_ue_spec.c
* \brief Top-level routines for generating UE-specific Reference signals from 36-211, V11.3.0 2013-06
* \author R. Knopp X. Jiang
* \date 2015
* \version 0.1
* \company Eurecom
* \email: knopp@eurecom.fr xiwen.jiang@eurecom.fr
* \note
* \warning
*/
#ifdef USER_MODE
#include <stdio.h>
#include <stdlib.h>
#endif
#include "defs.h"
#include "PHY/defs.h"
#include "log.h"
//extern unsigned int lte_gold_table[3][20][2][14];
//#define DEBUG_DL_CELL_SPEC
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,
uint8_t UE_id,
mod_sym_t *output,
short amp,
uint8_t Ns,
uint8_t lprime,
uint8_t p,
int SS_flag)
{
mod_sym_t qpsk[4],nqpsk[4];
int16_t k=0,a;
int mprime,ind,ind_dword,ind_qpsk_symb;
unsigned nushift,kprime;
// LTE_eNB_DLSCH_t *dlsch = phy_vars_eNB->dlsch_eNB[UE_id][0];
a = (amp*ONE_OVER_SQRT2_Q15)>>15;
((short *)&qpsk[0])[0] = a;
((short *)&qpsk[0])[1] = a;
((short *)&qpsk[1])[0] = -a;
((short *)&qpsk[1])[1] = a;
((short *)&qpsk[2])[0] = a;
((short *)&qpsk[2])[1] = -a;
((short *)&qpsk[3])[0] = -a;
((short *)&qpsk[3])[1] = -a;
((short *)&nqpsk[0])[0] = -a;
((short *)&nqpsk[0])[1] = -a;
((short *)&nqpsk[1])[0] = a;
((short *)&nqpsk[1])[1] = -a;
((short *)&nqpsk[2])[0] = -a;
((short *)&nqpsk[2])[1] = a;
((short *)&nqpsk[3])[0] = a;
((short *)&nqpsk[3])[1] = a;
if (p==5) {
if (SS_flag==0) {
if (phy_vars_eNB->lte_frame_parms.Ncp == NORMAL) {
// this is 3GPP 36-211 6.10.3.2, NORMAL CP, p=5
nushift = phy_vars_eNB->lte_frame_parms.Nid_cell%3;
if(lprime==0){
kprime=nushift;
}else{
kprime=(nushift+2*lprime)%4;
}
k = kprime+phy_vars_eNB->lte_frame_parms.first_carrier_offset;
printf("lte_dl_ue_spec:k=%d\n",k);
for (mprime=0;mprime<3*nRB_PDSCH-1;mprime++) {
ind = 3*lprime*nRB_PDSCH+mprime;
ind_dword = ind>>4;
ind_qpsk_symb = ind&0xf;
output[k] = qpsk[(phy_vars_UE->lte_gold_uespec_port5_table[Ns][ind_dword]>>(2*ind_qpsk_symb))&3];
//output[k] = 0xffffffff;
k += 4;
if (k >= phy_vars_eNB->lte_frame_parms.ofdm_symbol_size) {
k++; // skip DC carrier
k-=phy_vars_eNB->lte_frame_parms.ofdm_symbol_size;
}
}
}
}
} else if (p>=7) {
printf("lte_dl_ue_spec:antenna ports >=7 not supported yet!\n");
} else {
LOG_E(PHY,"Illegal p %d UE specific pilots\n",p);
}
return(0);
}
*/
int lte_dl_ue_spec_rx(PHY_VARS_UE *phy_vars_ue,
mod_sym_t *output,
unsigned char Ns,
unsigned char p,
int lprime,
int SS_flag,
uint16_t nRB_PDSCH)
{
mod_sym_t qpsk[4],nqpsk[4],*qpsk_p,*output_p;
int w,mprime,ind,l,ind_dword,ind_qpsk_symb,nPRB;
short pamp;
// Compute the correct pilot amplitude, sqrt_rho_b = Q3.13
pamp = ONE_OVER_SQRT2_Q15;
// This includes complex conjugate for channel estimation
((short *)&qpsk[0])[0] = pamp;
((short *)&qpsk[0])[1] = -pamp;
((short *)&qpsk[1])[0] = -pamp;
((short *)&qpsk[1])[1] = -pamp;
((short *)&qpsk[2])[0] = pamp;
((short *)&qpsk[2])[1] = pamp;
((short *)&qpsk[3])[0] = -pamp;
((short *)&qpsk[3])[1] = pamp;
((short *)&nqpsk[0])[0] = -pamp;
((short *)&nqpsk[0])[1] = pamp;
((short *)&nqpsk[1])[0] = pamp;
((short *)&nqpsk[1])[1] = pamp;
((short *)&nqpsk[2])[0] = -pamp;
((short *)&nqpsk[2])[1] = -pamp;
((short *)&nqpsk[3])[0] = pamp;
((short *)&nqpsk[3])[1] = -pamp;
if (p>=7) {
if (SS_flag==0) {
if (phy_vars_ue->lte_frame_parms.Ncp == NORMAL) {
// this is 3GPP 36-211 6.10.3.2, NORMAL CP, p>=7
output_p = output;
ind = 3*lprime*phy_vars_ue->lte_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_ue->lte_frame_parms.N_RB_DL; nPRB+=2) {
// First pilot
w = Wbar_NCP[p-7][l];
qpsk_p = (w==1) ? qpsk : nqpsk;
ind_dword = ind>>4;
ind_qpsk_symb = ind&0xf;
*output_p = qpsk_p[(phy_vars_ue->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,ind_dword,ind_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);
#endif
output_p++;
ind++;
w = Wbar_NCP[p-7][3-l];
qpsk_p = (w==1) ? qpsk : nqpsk;
// Second pilot
ind_dword = ind>>4;
ind_qpsk_symb = ind&0xf;
*output_p = qpsk_p[(phy_vars_ue->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,ind_dword,ind_qpsk_symb);
LOG_D(PHY,"index = %d\n",(phy_vars_ue->lte_gold_uespec_table[0][Ns][lprime][ind_dword]>>(2*ind_qpsk_symb))&3);
#endif
output_p++;
ind++;
w = Wbar_NCP[p-7][l];
qpsk_p = (w==1) ? qpsk : nqpsk;
// Third pilot
ind_dword = ind>>4;
ind_qpsk_symb = ind&0xf;
*output_p = qpsk_p[(phy_vars_ue->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,ind_dword,ind_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);
#endif
output_p++;
ind++;
// Fourth pilot
w = Wbar_NCP[p-7][3-l];
qpsk_p = (w==1) ? qpsk : nqpsk;
ind_dword = ind>>4;
ind_qpsk_symb = ind&0xf;
*output_p = qpsk_p[(phy_vars_ue->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,ind_dword,ind_qpsk_symb);
LOG_D(PHY,"index = %d\n",(phy_vars_ue->lte_gold_uespec_table[0][Ns][lprime][ind_dword]>>(2*ind_qpsk_symb))&3);
#endif
output_p++;
ind++;
w = Wbar_NCP[p-7][l];
qpsk_p = (w==1) ? qpsk : nqpsk;
// Fifth pilot
ind_dword = ind>>4;
ind_qpsk_symb = ind&0xf;
*output_p = qpsk_p[(phy_vars_ue->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,ind_dword,ind_qpsk_symb);
LOG_D(PHY,"index = %d\n",(phy_vars_ue->lte_gold_uespec_table[0][Ns][lprime][ind_dword]>>(2*ind_qpsk_symb))&3);
#endif
output_p++;
ind++;
w = Wbar_NCP[p-7][3-l];
qpsk_p = (w==1) ? qpsk : nqpsk;
// Sixth pilot
ind_dword = ind>>4;
ind_qpsk_symb = ind&0xf;
*output_p = qpsk_p[(phy_vars_ue->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,ind_dword,ind_qpsk_symb);
LOG_D(PHY,"index = %d\n",(phy_vars_ue->lte_gold_uespec_table[0][Ns][lprime][ind_dword]>>(2*ind_qpsk_symb))&3);
#endif
output_p++;
ind++;
}
} else {
LOG_E(PHY,"Special subframe not supported for UE specific pilots yet\n");
}
}
} else if (p==5) {
if (SS_flag==0) {
output_p = output;
if (phy_vars_ue->lte_frame_parms.Ncp == NORMAL) {
for (mprime=0;mprime<3*nRB_PDSCH;mprime++) {
ind = 3*lprime*nRB_PDSCH+mprime;
ind_dword = ind>>4;
ind_qpsk_symb = ind&0xf;
*output_p = qpsk[(phy_vars_ue->lte_gold_uespec_port5_table[Ns][ind_dword]>>(2*ind_qpsk_symb))&3];
//printf("lprime=%d,ind=%d,Ns=%d,output_p=(%d,%d)\n",lprime,ind,Ns,((short *)&output_p[0])[0],((short *)&output_p[0])[1]);
output_p++;
}
}
}
} else {
LOG_E(PHY,"Illegal p %d UE specific pilots\n",p);
}
return(0);
}
#ifdef LTE_DL_CELL_SPEC_MAIN
//extern int write_output(const char *,const char *,void *,int,int,char);
// flag change eren
extern int write_output(const char *,const char *,void *,int,int,char);
main()
{
unsigned short Nid_cell=0;
unsigned int Ncp = 0;
int output00[1024];
int output01[1024];
int output10[1024];
int output11[1024];
memset(output00,0,1024*sizeof(int));
memset(output01,0,1024*sizeof(int));
memset(output10,0,1024*sizeof(int));
memset(output11,0,1024*sizeof(int));
lte_gold(Nid_cell,Ncp);
lte_dl_ue_spec(output00,
ONE_OVER_SQRT2_Q15,
50,
Nid_cell,
Ncp,
0,
0,
0,
0);
lte_dl_ue_spec(output10,
ONE_OVER_SQRT2_Q15,
50,
Nid_cell,
Ncp,
0,
1,
0,
0);
lte_dl_ue_spec(output01,
ONE_OVER_SQRT2_Q15,
50,
Nid_cell,
Ncp,
0,
0,
1,
0);
lte_dl_ue_spec(output11,
ONE_OVER_SQRT2_Q15,
50,
Nid_cell,
Ncp,
0,
1,
1,
0);
write_output("dl_ue_spec00.m","dl_cs00",output00,1024,1,1);
write_output("dl_ue_spec01.m","dl_cs01",output01,1024,1,1);
write_output("dl_ue_spec10.m","dl_cs10",output10,1024,1,1);
write_output("dl_ue_spec11.m","dl_cs11",output11,1024,1,1);
}
#endif
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