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openairinterface5g/openair1/PHY/LTE_TRANSPORT/srs_modulation.c
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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@lists.eurecom.fr
Address : Eurecom, Campus SophiaTech, 450 Route des Chappes, CS 50193 - 06904 Biot Sophia Antipolis cedex, FRANCE
*******************************************************************************/
/*! \file PHY/LTE_TRANSPORT/srs_modulation.c
* \brief Top-level routines for generating sounding reference signal (SRS) V8.6 2009-03
* \author R. Knopp, F. Kaltenberger
* \date 2011
* \version 0.1
* \company Eurecom
* \email: knopp@eurecom.fr, florian.kaltenberger@eurecom.fr
* \note
* \warning
*/
#include "PHY/defs.h"
#include "extern.h"
#include "UTIL/LOG/log.h"
unsigned short msrsb_6_40[8][4] = {{36,12,4,4},
{32,16,8,4},
{24,4,4,4},
{20,4,4,4},
{16,4,4,4},
{12,4,4,4},
{8,4,4,4},
{4,4,4,4}
};
unsigned short msrsb_41_60[8][4] = {{48,24,12,4},
{48,16,8,4},
{40,20,4,4},
{36,12,4,4},
{32,16,8,4},
{24,4,4,4},
{20,4,4,4},
{16,4,4,4}
};
unsigned short msrsb_61_80[8][4] = {{72,24,12,4},
{64,32,16,4},
{60,20,4,4},
{48,24,12,4},
{48,16,8,4},
{40,20,4,4},
{36,12,4,4},
{32,16,8,4}
};
unsigned short msrsb_81_110[8][4] = {{96,48,24,4},
{96,32,16,4},
{80,40,20,4},
{72,24,12,4},
{64,32,16,4},
{60,20,4,4},
{48,24,12,4},
{48,16,8,4}
};
unsigned short Nb_6_40[8][4] = {{36,12,4,4},
{32,16,8,4},
{24,4,4,4},
{20,4,4,4},
{16,4,4,4},
{12,4,4,4},
{8,4,4,4},
{4,4,4,4}
};
unsigned short Nb_41_60[8][4] = {{48,24,12,4},
{48,16,8,4},
{40,20,4,4},
{36,12,4,4},
{32,16,8,4},
{24,4,4,4},
{20,4,4,4},
{16,4,4,4}
};
unsigned short Nb_61_80[8][4] = {{72,24,12,4},
{64,32,16,4},
{60,20,4,4},
{48,24,12,4},
{48,16,8,4},
{40,20,4,4},
{36,12,4,4},
{32,16,8,4}
};
unsigned short Nb_81_110[8][4] = {{96,48,24,4},
{96,32,16,4},
{80,40,20,4},
{72,24,12,4},
{64,32,16,4},
{60,20,4,4},
{48,24,12,4},
{48,16,8,4}
};
unsigned short transmission_offset_tdd[16] = {2,6,10,18,14,22,26,30,70,74,194,326,586,210};
int compareints (const void * a, const void * b)
{
return ( *(unsigned short*)a - *(unsigned short*)b );
}
int32_t generate_srs_tx(PHY_VARS_UE *ue,
uint8_t eNB_id,
int16_t amp,
uint32_t subframe)
{
LTE_DL_FRAME_PARMS *frame_parms=&ue->frame_parms;
SOUNDINGRS_UL_CONFIG_DEDICATED *soundingrs_ul_config_dedicated=&ue->soundingrs_ul_config_dedicated[eNB_id];
int32_t *txdataF = ue->common_vars.txdataF[0];
uint16_t msrsb=0,Nb=0,nb,b,msrs0=0,k,Msc_RS,Msc_RS_idx,carrier_pos,symbol_offset;
uint16_t *Msc_idx_ptr;
int32_t k0;
uint32_t T_SFC;
uint32_t subframe_offset;
uint8_t Bsrs = soundingrs_ul_config_dedicated->srs_Bandwidth;
uint8_t Csrs = frame_parms->soundingrs_ul_config_common.srs_BandwidthConfig;
uint8_t Ssrs = frame_parms->soundingrs_ul_config_common.srs_SubframeConfig;
uint8_t n_RRC = soundingrs_ul_config_dedicated->freqDomainPosition;
uint8_t kTC = soundingrs_ul_config_dedicated->transmissionComb;
if (frame_parms->N_RB_UL < 41) {
msrs0 = msrsb_6_40[Csrs][0];
msrsb = msrsb_6_40[Csrs][Bsrs];
Nb = Nb_6_40[Csrs][Bsrs];
} else if (frame_parms->N_RB_UL < 61) {
msrs0 = msrsb_41_60[Csrs][0];
msrsb = msrsb_41_60[Csrs][Bsrs];
Nb = Nb_41_60[Csrs][Bsrs];
} else if (frame_parms->N_RB_UL < 81) {
msrs0 = msrsb_61_80[Csrs][0];
msrsb = msrsb_61_80[Csrs][Bsrs];
Nb = Nb_61_80[Csrs][Bsrs];
} else if (frame_parms->N_RB_UL <111) {
msrs0 = msrsb_81_110[Csrs][0];
msrsb = msrsb_81_110[Csrs][Bsrs];
Nb = Nb_81_110[Csrs][Bsrs];
}
Msc_RS = msrsb * 6;
k0 = (((frame_parms->N_RB_UL>>1)-(msrs0>>1))*12) + kTC;
nb = (4*n_RRC/msrsb)%Nb;
for (b=0; b<=Bsrs; b++) {
k0 += 2*nb*Msc_RS;
}
if (k0<0) {
msg("generate_srs: invalid parameter set msrs0=%d, msrsb=%d, Nb=%d => nb=%d, k0=%d\n",msrs0,msrsb,Nb,nb,k0);
return(-1);
}
#ifdef USER_MODE
Msc_idx_ptr = (uint16_t*) bsearch((uint16_t*) &Msc_RS, (uint16_t*) dftsizes, 33, sizeof(uint16_t), compareints);
if (Msc_idx_ptr)
Msc_RS_idx = Msc_idx_ptr - dftsizes;
else {
msg("generate_srs: index for Msc_RS=%d not found\n",Msc_RS);
return(-1);
}
#else //stdlib not availiable in RTAI
if (Msc_RS==216)
Msc_RS_idx = 12;
else if (Msc_RS==144)
Msc_RS_idx = 9;
else {
msg("generate_srs: index for Msc_RS=%d not implemented\n",Msc_RS);
return(-1);
}
#endif
#ifdef DEBUG_SRS
msg("generate_srs_tx: Msc_RS = %d, Msc_RS_idx = %d\n",Msc_RS, Msc_RS_idx);
#endif
T_SFC = (Ssrs<=7 ? 5 : 10);
if ((1<<(subframe%T_SFC))&transmission_offset_tdd[Ssrs]) {
#ifndef IFFT_FPGA_UE
carrier_pos = (frame_parms->first_carrier_offset + k0) % frame_parms->ofdm_symbol_size;
//msg("carrier_pos = %d\n",carrier_pos);
subframe_offset = subframe*frame_parms->symbols_per_tti*frame_parms->ofdm_symbol_size;
symbol_offset = subframe_offset+(frame_parms->symbols_per_tti-1)*frame_parms->ofdm_symbol_size;
for (k=0; k<Msc_RS; k++) {
((short*) txdataF)[2*(symbol_offset + carrier_pos)] = (short) (((int32_t) amp * (int32_t) ul_ref_sigs[0][0][Msc_RS_idx][k<<1])>>15);
((short*) txdataF)[2*(symbol_offset + carrier_pos)+1] = (short) (((int32_t) amp * (int32_t) ul_ref_sigs[0][0][Msc_RS_idx][(k<<1)+1])>>15);
carrier_pos+=2;
if (carrier_pos >= frame_parms->ofdm_symbol_size)
carrier_pos=1;
}
#else
carrier_pos = (frame_parms->N_RB_UL*12/2 + k0) % (frame_parms->N_RB_UL*12);
//msg("carrier_pos = %d\n",carrier_pos);
subframe_offset = subframe*frame_parms->symbols_per_tti*frame_parms->N_RB_UL*12;
symbol_offset = subframe_offset+(frame_parms->symbols_per_tti-1)*frame_parms->N_RB_UL*12;
for (k=0; k<Msc_RS; k++) {
if ((ul_ref_sigs[0][0][Msc_RS_idx][k<<1] >= 0) && (ul_ref_sigs[0][0][Msc_RS_idx][(k<<1)+1] >= 0))
txdataF[symbol_offset+carrier_pos] = (int32_t) 4;
else if ((ul_ref_sigs[0][0][Msc_RS_idx][k<<1] >= 0) && (ul_ref_sigs[0][0][Msc_RS_idx][(k<<1)+1] < 0))
txdataF[symbol_offset+carrier_pos] = (int32_t) 2;
else if ((ul_ref_sigs[0][0][Msc_RS_idx][k<<1] < 0) && (ul_ref_sigs[0][0][Msc_RS_idx][(k<<1)+1] >= 0))
txdataF[symbol_offset+carrier_pos] = (int32_t) 3;
else if ((ul_ref_sigs[0][0][Msc_RS_idx][k<<1] < 0) && (ul_ref_sigs[0][0][Msc_RS_idx][(k<<1)+1] < 0))
txdataF[symbol_offset+carrier_pos] = (int32_t) 1;
carrier_pos+=2;
if (carrier_pos >= frame_parms->N_RB_UL*12)
carrier_pos=0;
}
#endif
// write_output("srs_txF.m","srstxF",&txdataF[symbol_offset],512,1,1);
}
return(0);
}
int generate_srs_tx_emul(PHY_VARS_UE *phy_vars_ue,uint8_t subframe)
{
LOG_D(PHY,"[UE] generate_srs_tx_emul for subframe %d\n",subframe);
return(0);
}
int generate_srs_rx(LTE_DL_FRAME_PARMS *frame_parms,
SOUNDINGRS_UL_CONFIG_DEDICATED *soundingrs_ul_config_dedicated,
int *txdataF)
{
uint16_t msrsb=0,Nb=0,nb,b,msrs0=0,k,Msc_RS,Msc_RS_idx,carrier_pos;
uint16_t *Msc_idx_ptr;
int k0;
uint8_t Bsrs = soundingrs_ul_config_dedicated->srs_Bandwidth;
uint8_t Csrs = frame_parms->soundingrs_ul_config_common.srs_BandwidthConfig;
uint8_t n_RRC = soundingrs_ul_config_dedicated->freqDomainPosition;
uint8_t kTC = soundingrs_ul_config_dedicated->transmissionComb;
if (frame_parms->N_RB_UL < 41) {
msrs0 = msrsb_6_40[Csrs][0];
msrsb = msrsb_6_40[Csrs][Bsrs];
Nb = Nb_6_40[Csrs][Bsrs];
} else if (frame_parms->N_RB_UL < 61) {
msrs0 = msrsb_41_60[Csrs][0];
msrsb = msrsb_41_60[Csrs][Bsrs];
Nb = Nb_41_60[Csrs][Bsrs];
} else if (frame_parms->N_RB_UL < 81) {
msrs0 = msrsb_61_80[Csrs][0];
msrsb = msrsb_61_80[Csrs][Bsrs];
Nb = Nb_61_80[Csrs][Bsrs];
} else if (frame_parms->N_RB_UL <111) {
msrs0 = msrsb_81_110[Csrs][0];
msrsb = msrsb_81_110[Csrs][Bsrs];
Nb = Nb_81_110[Csrs][Bsrs];
}
Msc_RS = msrsb * 6;
k0 = (((frame_parms->N_RB_UL>>1)-(msrs0>>1))*12) + kTC;
nb = (4*n_RRC/msrsb)%Nb;
for (b=0; b<=Bsrs; b++) {
k0 += 2*nb*Msc_RS;
}
if (k0<0) {
msg("Invalid parameter set msrs0=%d, msrsb=%d, Nb=%d => nb=%d, k0=%d\n",msrs0,msrsb,Nb,nb,k0);
return(-1);
}
#ifdef USER_MODE
Msc_idx_ptr = (uint16_t*) bsearch((uint16_t*) &Msc_RS, (uint16_t*) dftsizes, 33, sizeof(uint16_t), compareints);
if (Msc_idx_ptr)
Msc_RS_idx = Msc_idx_ptr - dftsizes;
else {
msg("generate_srs: index for Msc_RS=%d not found\n",Msc_RS);
return(-1);
}
#else //stdlib not availiable in RTAI
if (Msc_RS==216)
Msc_RS_idx = 12;
else if (Msc_RS==144)
Msc_RS_idx = 9;
else {
msg("generate_srs: index for Msc_RS=%d not implemented\n",Msc_RS);
return(-1);
}
#endif
#ifdef DEBUG_SRS
msg("generate_srs_rx: Msc_RS = %d, Msc_RS_idx = %d, k0=%d\n",Msc_RS, Msc_RS_idx,k0);
#endif
carrier_pos = (frame_parms->first_carrier_offset + k0) % frame_parms->ofdm_symbol_size;
for (k=0; k<Msc_RS; k++) {
((short*) txdataF)[carrier_pos<<2] = ul_ref_sigs_rx[0][0][Msc_RS_idx][k<<2];
((short*) txdataF)[(carrier_pos<<2)+1] = ul_ref_sigs_rx[0][0][Msc_RS_idx][(k<<2)+1];
((short*) txdataF)[(carrier_pos<<2)+2] = ul_ref_sigs_rx[0][0][Msc_RS_idx][(k<<2)+2];
((short*) txdataF)[(carrier_pos<<2)+3] = ul_ref_sigs_rx[0][0][Msc_RS_idx][(k<<2)+3];
carrier_pos+=2;
if (carrier_pos >= frame_parms->ofdm_symbol_size)
carrier_pos=1;
}
/*
for (k=0;k<Msc_RS;k++) {
if ((ul_ref_sigs[0][0][Msc_RS_idx][k<<1] >= 0) && (ul_ref_sigs[0][0][Msc_RS_idx][(k<<1)+1] >= 0)) {
((short*) txdataF)[4*(symbol_offset + carrier_pos)] = ONE_OVER_SQRT2_Q15;
((short*) txdataF)[4*(symbol_offset + carrier_pos)+1] = ONE_OVER_SQRT2_Q15;
((short*) txdataF)[4*(symbol_offset + carrier_pos)+2] = -ONE_OVER_SQRT2_Q15;
((short*) txdataF)[4*(symbol_offset + carrier_pos)+3] = ONE_OVER_SQRT2_Q15;
}
else if ((ul_ref_sigs[0][0][Msc_RS_idx][k<<1] >= 0) && (ul_ref_sigs[0][0][Msc_RS_idx][(k<<1)+1] < 0)) {
((short*) txdataF)[4*(symbol_offset + carrier_pos)] = ONE_OVER_SQRT2_Q15;
((short*) txdataF)[4*(symbol_offset + carrier_pos)+1] = -ONE_OVER_SQRT2_Q15;
((short*) txdataF)[4*(symbol_offset + carrier_pos)+2] = ONE_OVER_SQRT2_Q15;
((short*) txdataF)[4*(symbol_offset + carrier_pos)+3] = ONE_OVER_SQRT2_Q15;
}
else if ((ul_ref_sigs[0][0][Msc_RS_idx][k<<1] < 0) && (ul_ref_sigs[0][0][Msc_RS_idx][(k<<1)+1] >= 0)) {
((short*) txdataF)[4*(symbol_offset + carrier_pos)] = -ONE_OVER_SQRT2_Q15;
((short*) txdataF)[4*(symbol_offset + carrier_pos)+1] = ONE_OVER_SQRT2_Q15;
((short*) txdataF)[4*(symbol_offset + carrier_pos)+2] = -ONE_OVER_SQRT2_Q15;
((short*) txdataF)[4*(symbol_offset + carrier_pos)+3] = -ONE_OVER_SQRT2_Q15;
}
else if ((ul_ref_sigs[0][0][Msc_RS_idx][k<<1] < 0) && (ul_ref_sigs[0][0][Msc_RS_idx][(k<<1)+1] < 0)) {
((short*) txdataF)[4*(symbol_offset + carrier_pos)] = -ONE_OVER_SQRT2_Q15;
((short*) txdataF)[4*(symbol_offset + carrier_pos)+1] = -ONE_OVER_SQRT2_Q15;
((short*) txdataF)[4*(symbol_offset + carrier_pos)+2] = ONE_OVER_SQRT2_Q15;
((short*) txdataF)[4*(symbol_offset + carrier_pos)+3] = -ONE_OVER_SQRT2_Q15;
}
carrier_pos+=2;
if (carrier_pos >= frame_parms->ofdm_symbol_size)
carrier_pos=0;
}
*/
// write_output("srs_rx.m","srsrx",txdataF,1024,2,1);
return(0);
}
#ifdef MAIN
main()
{
}
#endif
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