371 lines
11 KiB
C
371 lines
11 KiB
C
/*
|
|
* Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership.
|
|
* The OpenAirInterface Software Alliance licenses this file to You under
|
|
* the OAI Public License, Version 1.1 (the "License"); you may not use this file
|
|
* except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.openairinterface.org/?page_id=698
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*-------------------------------------------------------------------------------
|
|
* For more information about the OpenAirInterface (OAI) Software Alliance:
|
|
* contact@openairinterface.org
|
|
*/
|
|
|
|
/*
|
|
* @defgroup _PHY_MODULATION_
|
|
* @ingroup _physical_layer_ref_implementation_
|
|
* @{
|
|
\section _phy_modulation_ OFDM Modulation Blocks
|
|
This section deals with basic functions for OFDM Modulation.
|
|
|
|
|
|
|
|
*/
|
|
|
|
#include "PHY/defs_eNB.h"
|
|
#include "PHY/defs_gNB.h"
|
|
#include "PHY/impl_defs_top.h"
|
|
#include "common/utils/LOG/log.h"
|
|
#include "common/utils/LOG/vcd_signal_dumper.h"
|
|
#include "modulation_common.h"
|
|
#include "PHY/LTE_TRANSPORT/transport_common_proto.h"
|
|
//#define DEBUG_OFDM_MOD
|
|
|
|
|
|
void normal_prefix_mod(int32_t *txdataF,int32_t *txdata,uint8_t nsymb,LTE_DL_FRAME_PARMS *frame_parms)
|
|
{
|
|
|
|
|
|
|
|
PHY_ofdm_mod(txdataF, // input
|
|
txdata, // output
|
|
frame_parms->ofdm_symbol_size,
|
|
|
|
1, // number of symbols
|
|
frame_parms->nb_prefix_samples0, // number of prefix samples
|
|
CYCLIC_PREFIX);
|
|
PHY_ofdm_mod(txdataF+frame_parms->ofdm_symbol_size, // input
|
|
txdata+OFDM_SYMBOL_SIZE_COMPLEX_SAMPLES0, // output
|
|
frame_parms->ofdm_symbol_size,
|
|
nsymb-1,
|
|
frame_parms->nb_prefix_samples, // number of prefix samples
|
|
CYCLIC_PREFIX);
|
|
|
|
|
|
|
|
}
|
|
|
|
void nr_normal_prefix_mod(int32_t *txdataF,int32_t *txdata,uint8_t nsymb,NR_DL_FRAME_PARMS *frame_parms, uint32_t slot)
|
|
{
|
|
// This function works only slot wise. For more generic symbol generation refer nr_feptx0()
|
|
if (frame_parms->numerology_index != 0) { // case where numerology != 0
|
|
if (!(slot%(frame_parms->slots_per_subframe/2))) {
|
|
PHY_ofdm_mod(txdataF,
|
|
txdata,
|
|
frame_parms->ofdm_symbol_size,
|
|
1,
|
|
frame_parms->nb_prefix_samples0,
|
|
CYCLIC_PREFIX);
|
|
PHY_ofdm_mod(txdataF+frame_parms->ofdm_symbol_size,
|
|
txdata + frame_parms->ofdm_symbol_size + frame_parms->nb_prefix_samples0,
|
|
frame_parms->ofdm_symbol_size,
|
|
nsymb - 1,
|
|
frame_parms->nb_prefix_samples,
|
|
CYCLIC_PREFIX);
|
|
}
|
|
else {
|
|
PHY_ofdm_mod(txdataF,
|
|
txdata,
|
|
frame_parms->ofdm_symbol_size,
|
|
nsymb,
|
|
frame_parms->nb_prefix_samples,
|
|
CYCLIC_PREFIX);
|
|
}
|
|
}
|
|
else { // numerology = 0, longer CP for every 7th symbol
|
|
PHY_ofdm_mod(txdataF,
|
|
txdata,
|
|
frame_parms->ofdm_symbol_size,
|
|
1,
|
|
frame_parms->nb_prefix_samples0,
|
|
CYCLIC_PREFIX);
|
|
PHY_ofdm_mod(txdataF+frame_parms->ofdm_symbol_size,
|
|
txdata + frame_parms->ofdm_symbol_size + frame_parms->nb_prefix_samples0,
|
|
frame_parms->ofdm_symbol_size,
|
|
6,
|
|
frame_parms->nb_prefix_samples,
|
|
CYCLIC_PREFIX);
|
|
PHY_ofdm_mod(txdataF + 7*frame_parms->ofdm_symbol_size,
|
|
txdata + 6*(frame_parms->ofdm_symbol_size+frame_parms->nb_prefix_samples) +
|
|
frame_parms->ofdm_symbol_size + frame_parms->nb_prefix_samples0,
|
|
frame_parms->ofdm_symbol_size,
|
|
1,
|
|
frame_parms->nb_prefix_samples0,
|
|
CYCLIC_PREFIX);
|
|
PHY_ofdm_mod(txdataF + 8*frame_parms->ofdm_symbol_size,
|
|
txdata + 6*(frame_parms->ofdm_symbol_size+frame_parms->nb_prefix_samples) +
|
|
2*(frame_parms->ofdm_symbol_size + frame_parms->nb_prefix_samples0),
|
|
frame_parms->ofdm_symbol_size,
|
|
6,
|
|
frame_parms->nb_prefix_samples,
|
|
CYCLIC_PREFIX);
|
|
}
|
|
|
|
}
|
|
|
|
void PHY_ofdm_mod(int *input, /// pointer to complex input
|
|
int *output, /// pointer to complex output
|
|
int fftsize, /// FFT_SIZE
|
|
unsigned char nb_symbols, /// number of OFDM symbols
|
|
unsigned short nb_prefix_samples, /// cyclic prefix length
|
|
Extension_t etype /// type of extension
|
|
)
|
|
{
|
|
|
|
if(nb_symbols == 0) return;
|
|
|
|
int16_t temp[2*2*6144*4] __attribute__((aligned(32)));
|
|
int i,j;
|
|
|
|
volatile int *output_ptr=(int*)0;
|
|
|
|
int *temp_ptr=(int*)0;
|
|
idft_size_idx_t idftsize;
|
|
|
|
switch (fftsize) {
|
|
case 128:
|
|
idftsize = IDFT_128;
|
|
break;
|
|
|
|
case 256:
|
|
idftsize = IDFT_256;
|
|
break;
|
|
|
|
case 512:
|
|
idftsize = IDFT_512;
|
|
break;
|
|
|
|
case 1024:
|
|
idftsize = IDFT_1024;
|
|
break;
|
|
|
|
case 1536:
|
|
idftsize = IDFT_1536;
|
|
break;
|
|
|
|
case 2048:
|
|
idftsize = IDFT_2048;
|
|
break;
|
|
|
|
case 3072:
|
|
idftsize = IDFT_3072;
|
|
break;
|
|
|
|
case 4096:
|
|
idftsize = IDFT_4096;
|
|
break;
|
|
|
|
case 6144:
|
|
idftsize= IDFT_6144;
|
|
break;
|
|
|
|
case 12288:
|
|
idftsize= IDFT_12288;
|
|
break;
|
|
|
|
case 24576:
|
|
idftsize= IDFT_24576;
|
|
break;
|
|
|
|
default:
|
|
idftsize = IDFT_512;
|
|
break;
|
|
}
|
|
|
|
#ifdef DEBUG_OFDM_MOD
|
|
printf("[PHY] OFDM mod (size %d,prefix %d) Symbols %d, input %p, output %p\n",
|
|
fftsize,nb_prefix_samples,nb_symbols,input,output);
|
|
#endif
|
|
|
|
|
|
|
|
for (i=0; i<nb_symbols; i++) {
|
|
|
|
#ifdef DEBUG_OFDM_MOD
|
|
printf("[PHY] symbol %d/%d offset %d (%p,%p -> %p)\n",i,nb_symbols,i*fftsize+(i*nb_prefix_samples),input,&input[i*fftsize],&output[(i*fftsize) + ((i)*nb_prefix_samples)]);
|
|
#endif
|
|
|
|
#ifndef __AVX2__
|
|
// handle 128-bit alignment for 128-bit SIMD (SSE4,NEON,AltiVEC)
|
|
idft(idftsize,(int16_t *)&input[i*fftsize],
|
|
(fftsize==128) ? (int16_t *)temp : (int16_t *)&output[(i*fftsize) + ((1+i)*nb_prefix_samples)],
|
|
1);
|
|
#else
|
|
// on AVX2 need 256-bit alignment
|
|
idft(idftsize,(int16_t *)&input[i*fftsize],
|
|
(int16_t *)temp,
|
|
1);
|
|
|
|
#endif
|
|
|
|
// Copy to frame buffer with Cyclic Extension
|
|
// Note: will have to adjust for synchronization offset!
|
|
|
|
switch (etype) {
|
|
case CYCLIC_PREFIX:
|
|
output_ptr = &output[(i*fftsize) + ((1+i)*nb_prefix_samples)];
|
|
temp_ptr = (int *)temp;
|
|
|
|
|
|
// msg("Doing cyclic prefix method\n");
|
|
|
|
#ifndef __AVX2__
|
|
if (fftsize==128)
|
|
#endif
|
|
{
|
|
memcpy((void*)output_ptr,(void*)temp_ptr,fftsize<<2);
|
|
}
|
|
memcpy((void*)&output_ptr[-nb_prefix_samples],(void*)&output_ptr[fftsize-nb_prefix_samples],nb_prefix_samples<<2);
|
|
break;
|
|
|
|
case CYCLIC_SUFFIX:
|
|
|
|
|
|
output_ptr = &output[(i*fftsize)+ (i*nb_prefix_samples)];
|
|
|
|
temp_ptr = (int *)temp;
|
|
|
|
// msg("Doing cyclic suffix method\n");
|
|
|
|
for (j=0; j<fftsize ; j++) {
|
|
output_ptr[j] = temp_ptr[2*j];
|
|
}
|
|
|
|
|
|
for (j=0; j<nb_prefix_samples; j++)
|
|
output_ptr[fftsize+j] = output_ptr[j];
|
|
|
|
break;
|
|
|
|
case ZEROS:
|
|
|
|
break;
|
|
|
|
case NONE:
|
|
|
|
// msg("NO EXTENSION!\n");
|
|
output_ptr = &output[fftsize];
|
|
|
|
temp_ptr = (int *)temp;
|
|
|
|
for (j=0; j<fftsize ; j++) {
|
|
output_ptr[j] = temp_ptr[2*j];
|
|
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
void do_OFDM_mod(int32_t **txdataF, int32_t **txdata, uint32_t frame,uint16_t next_slot, LTE_DL_FRAME_PARMS *frame_parms)
|
|
{
|
|
|
|
int aa, slot_offset, slot_offset_F;
|
|
|
|
slot_offset_F = (next_slot)*(frame_parms->ofdm_symbol_size)*((frame_parms->Ncp==1) ? 6 : 7);
|
|
slot_offset = (next_slot)*(frame_parms->samples_per_tti>>1);
|
|
|
|
for (aa=0; aa<frame_parms->nb_antennas_tx; aa++) {
|
|
if (is_pmch_subframe(frame,next_slot>>1,frame_parms)) {
|
|
if ((next_slot%2)==0) {
|
|
LOG_D(PHY,"Frame %d, subframe %d: Doing MBSFN modulation (slot_offset %d)\n",frame,next_slot>>1,slot_offset);
|
|
PHY_ofdm_mod(&txdataF[aa][slot_offset_F], // input
|
|
&txdata[aa][slot_offset], // output
|
|
frame_parms->ofdm_symbol_size,
|
|
12, // number of symbols
|
|
frame_parms->ofdm_symbol_size>>2, // number of prefix samples
|
|
CYCLIC_PREFIX);
|
|
|
|
if (frame_parms->Ncp == EXTENDED)
|
|
PHY_ofdm_mod(&txdataF[aa][slot_offset_F], // input
|
|
&txdata[aa][slot_offset], // output
|
|
frame_parms->ofdm_symbol_size,
|
|
2, // number of symbols
|
|
frame_parms->nb_prefix_samples, // number of prefix samples
|
|
CYCLIC_PREFIX);
|
|
else {
|
|
LOG_D(PHY,"Frame %d, subframe %d: Doing PDCCH modulation\n",frame,next_slot>>1);
|
|
normal_prefix_mod(&txdataF[aa][slot_offset_F],
|
|
&txdata[aa][slot_offset],
|
|
2,
|
|
frame_parms);
|
|
}
|
|
}
|
|
} else {
|
|
if (frame_parms->Ncp == EXTENDED)
|
|
PHY_ofdm_mod(&txdataF[aa][slot_offset_F], // input
|
|
&txdata[aa][slot_offset], // output
|
|
frame_parms->ofdm_symbol_size,
|
|
6, // number of symbols
|
|
frame_parms->nb_prefix_samples, // number of prefix samples
|
|
CYCLIC_PREFIX);
|
|
else {
|
|
normal_prefix_mod(&txdataF[aa][slot_offset_F],
|
|
&txdata[aa][slot_offset],
|
|
7,
|
|
frame_parms);
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
void apply_nr_rotation(NR_DL_FRAME_PARMS *fp,
|
|
int16_t* trxdata,
|
|
int slot,
|
|
int first_symbol,
|
|
int nsymb,
|
|
int length) {
|
|
int symb_offset = (slot%fp->slots_per_subframe)*fp->symbols_per_slot;
|
|
|
|
c16_t *symbol_rotation = fp->symbol_rotation[0];
|
|
|
|
for (int sidx=0;sidx<nsymb;sidx++) {
|
|
|
|
LOG_D(PHY,"Rotating symbol %d, slot %d, symbol_subframe_index %d, length %d (%d,%d)\n",
|
|
first_symbol + sidx,
|
|
slot,
|
|
sidx + first_symbol + symb_offset,
|
|
length,
|
|
symbol_rotation[sidx + first_symbol + symb_offset].r,
|
|
symbol_rotation[sidx + first_symbol + symb_offset].i);
|
|
|
|
rotate_cpx_vector(((c16_t*) trxdata) + sidx * length,
|
|
symbol_rotation + sidx + first_symbol + symb_offset,
|
|
((c16_t*) trxdata) + sidx * length,
|
|
length,
|
|
15);
|
|
}
|
|
}
|
|
|