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openairinterface5g/openair1/SIMULATION/TOOLS/multipath_channel.c
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/*
* 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
*/
#include <math.h>
#include "PHY/TOOLS/tools_defs.h"
#include "sim.h"
//#define DEBUG_CH
//#define DOPPLER_DEBUG
uint8_t multipath_channel_nosigconv(channel_desc_t *desc)
{
random_channel(desc,0);
return(1);
}
//#define CHANNEL_SSE
#ifdef CHANNEL_SSE
void __attribute__ ((no_sanitize_address)) multipath_channel(channel_desc_t *desc,
double tx_sig_re[NB_ANTENNAS_TX][30720*2],
double tx_sig_im[NB_ANTENANS_TX][30720*2],
double rx_sig_re[NB_ANTENNAS_RX][30720*2],
double rx_sig_im[NB_ANTENNAS_RX][30720*2],
uint32_t length,
uint8_t keep_channel,
int log_channel)
{
int i,ii,j,l;
int length1, length2, tail;
simde__m128d rx_tmp128_re_f, rx_tmp128_im_f, rx_tmp128_re, rx_tmp128_im, rx_tmp128_1, rx_tmp128_2, rx_tmp128_3, rx_tmp128_4,
tx128_re, tx128_im, ch128_x, ch128_y, pathloss128;
double path_loss = pow(10,desc->path_loss_dB/20);
uint64_t dd = desc->channel_offset;
pathloss128 = simde_mm_set1_pd(path_loss);
#ifdef DEBUG_CH
printf("[CHANNEL] keep = %d : path_loss = %g (%f), nb_rx %d, nb_tx %d, dd %lu, len %d \n",keep_channel,path_loss,desc->path_loss_dB,desc->nb_rx,desc->nb_tx,dd,desc->channel_length);
#endif
if (keep_channel) {
// do nothing - keep channel
} else {
random_channel(desc,0);
}
start_meas(&desc->convolution);
#ifdef DEBUG_CH
for (l = 0; l<(int)desc->channel_length; l++) {
printf("%p (%f,%f) ",desc->ch[0],desc->ch[0][l].x,desc->ch[0][l].y);
}
printf("\n");
#endif
tail = ((int)length-dd)%2;
if(tail)
length1 = ((int)length-dd)-1;
else
length1 = ((int)length-dd);
length2 = length1/2;
for (i=0; i<length2; i++) { //
for (ii=0; ii<desc->nb_rx; ii++) {
// rx_tmp.x = 0;
// rx_tmp.y = 0;
rx_tmp128_re_f = simde_mm_setzero_pd();
rx_tmp128_im_f = simde_mm_setzero_pd();
for (j=0; j<desc->nb_tx; j++) {
for (l = 0; l<(int)desc->channel_length; l++) {
if ((i>=0) && (i-l)>=0) { //SIMD correct only if length1 > 2*channel_length...which is almost always satisfied
// tx.x = tx_sig_re[j][i-l];
// tx.y = tx_sig_im[j][i-l];
tx128_re = simde_mm_loadu_pd(&tx_sig_re[j][2 * i - l]); // tx_sig_re[j][i-l+1], tx_sig_re[j][i-l]
tx128_im = simde_mm_loadu_pd(&tx_sig_im[j][2 * i - l]);
} else {
//tx.x =0;
//tx.y =0;
tx128_re = simde_mm_setzero_pd();
tx128_im = simde_mm_setzero_pd();
}
ch128_x = simde_mm_set1_pd(desc->ch[ii + (j * desc->nb_rx)][l].x);
ch128_y = simde_mm_set1_pd(desc->ch[ii + (j * desc->nb_rx)][l].y);
// rx_tmp.x += (tx.x * desc->ch[ii+(j*desc->nb_rx)][l].x) - (tx.y * desc->ch[ii+(j*desc->nb_rx)][l].y);
// rx_tmp.y += (tx.y * desc->ch[ii+(j*desc->nb_rx)][l].x) + (tx.x * desc->ch[ii+(j*desc->nb_rx)][l].y);
rx_tmp128_1 = simde_mm_mul_pd(tx128_re, ch128_x);
rx_tmp128_2 = simde_mm_mul_pd(tx128_re, ch128_y);
rx_tmp128_3 = simde_mm_mul_pd(tx128_im, ch128_x);
rx_tmp128_4 = simde_mm_mul_pd(tx128_im, ch128_y);
rx_tmp128_re = simde_mm_sub_pd(rx_tmp128_1, rx_tmp128_4);
rx_tmp128_im = simde_mm_add_pd(rx_tmp128_2, rx_tmp128_3);
rx_tmp128_re_f = simde_mm_add_pd(rx_tmp128_re_f, rx_tmp128_re);
rx_tmp128_im_f = simde_mm_add_pd(rx_tmp128_im_f, rx_tmp128_im);
} //l
} // j
//rx_sig_re[ii][i+dd] = rx_tmp.x*path_loss;
//rx_sig_im[ii][i+dd] = rx_tmp.y*path_loss;
rx_tmp128_re_f = simde_mm_mul_pd(rx_tmp128_re_f, pathloss128);
rx_tmp128_im_f = simde_mm_mul_pd(rx_tmp128_im_f, pathloss128);
simde_mm_storeu_pd(&rx_sig_re[ii][2 * i + dd], rx_tmp128_re_f); // max index: length-dd -1 + dd = length -1
simde_mm_storeu_pd(&rx_sig_im[ii][2 * i + dd], rx_tmp128_im_f);
/*
if ((ii==0)&&((i%32)==0)) {
printf("%p %p %f,%f => %e,%e\n",rx_sig_re[ii],rx_sig_im[ii],rx_tmp.x,rx_tmp.y,rx_sig_re[ii][i-dd],rx_sig_im[ii][i-dd]);
}
*/
//rx_sig_re[ii][i] = sqrt(.5)*(tx_sig_re[0][i] + tx_sig_re[1][i]);
//rx_sig_im[ii][i] = sqrt(.5)*(tx_sig_im[0][i] + tx_sig_im[1][i]);
} // ii
} // i
stop_meas(&desc->convolution);
}
#else
void add_noise(c16_t **rxdata,
const double **r_re,
const double **r_im,
const double sigma,
const int length,
const int slot_offset,
const double ts,
const int delay,
const uint16_t pdu_bit_map,
const uint16_t ptrs_bit_map,
const uint8_t nb_antennas_rx)
{
for (int i = 0; i < length; i++) {
for (int ap = 0; ap < nb_antennas_rx; ap++) {
c16_t *rxd = &rxdata[ap][slot_offset + i + delay];
rxd->r = r_re[ap][i] + sqrt(sigma / 2) * gaussZiggurat(0.0, 1.0); // convert to fixed point
rxd->i = r_im[ap][i] + sqrt(sigma / 2) * gaussZiggurat(0.0, 1.0);
/* Add phase noise if enabled */
if (pdu_bit_map & ptrs_bit_map) {
phase_noise(ts, &rxdata[ap][slot_offset + i + delay].r, &rxdata[ap][slot_offset + i + delay].i);
}
}
}
}
void __attribute__ ((no_sanitize_address)) multipath_channel(channel_desc_t *desc,
double *tx_sig_re[NB_ANTENNAS_TX],
double *tx_sig_im[NB_ANTENNAS_TX],
double *rx_sig_re[NB_ANTENNAS_RX],
double *rx_sig_im[NB_ANTENNAS_RX],
uint32_t length,
uint8_t keep_channel,
int log_channel)
{
double path_loss = pow(10,desc->path_loss_dB/20);
uint64_t dd = desc->channel_offset;
#ifdef DEBUG_CH
printf("[CHANNEL] keep = %d : path_loss = %g (%f), nb_rx %d, nb_tx %d, dd %lu, len %d \n",
keep_channel, path_loss, desc->path_loss_dB, desc->nb_rx, desc->nb_tx, dd, desc->channel_length);
#endif
if (keep_channel) {
// do nothing - keep channel
} else {
random_channel(desc,0);
}
#ifdef DEBUG_CH
for (l = 0; l<(int)desc->channel_length; l++) {
printf("ch[%i] = (%f, %f)\n", l, desc->ch[0][l].r, desc->ch[0][l].i);
}
#endif
struct complexd cexp_doppler[length];
if (desc->max_Doppler != 0.0) {
get_cexp_doppler(cexp_doppler, desc, length);
}
for (int i=0; i<((int)length-dd); i++) {
for (int ii=0; ii<desc->nb_rx; ii++) {
struct complexd rx_tmp={0};
for (int j=0; j<desc->nb_tx; j++) {
struct complexd *chan=desc->ch[ii+(j*desc->nb_rx)];
for (int l = 0; l<(int)desc->channel_length; l++) {
if ((i>=0) && (i-l)>=0) {
struct complexd tx;
tx.r = tx_sig_re[j][i-l];
tx.i = tx_sig_im[j][i-l];
rx_tmp.r += (tx.r * chan[l].r) - (tx.i * chan[l].i);
rx_tmp.i += (tx.i * chan[l].r) + (tx.r * chan[l].i);
}
#if 0
if (i==0 && log_channel == 1) {
printf("channel[%d][%d][%d] = %f dB \t(%e, %e)\n",
ii, j, l, 10 * log10(pow(chan[l].r, 2.0) + pow(chan[l].i, 2.0)), chan[l].r, chan[l].i);
}
#endif
} //l
} // j
#if 0
if (desc->max_Doppler != 0.0)
rx_tmp = cdMul(rx_tmp, cexp_doppler[i]);
#endif
#ifdef DOPPLER_DEBUG
printf("[k %2i] cexp_doppler = (%7.4f, %7.4f), abs(cexp_doppler) = %.4f\n",
i,
cexp_doppler[i].r,
cexp_doppler[i].i,
sqrt(cexp_doppler[i].r * cexp_doppler[i].r + cexp_doppler[i].i * cexp_doppler[i].i));
#endif
rx_sig_re[ii][i+dd] = rx_tmp.r*path_loss;
rx_sig_im[ii][i+dd] = rx_tmp.i*path_loss;
#ifdef DEBUG_CH
if ((i%32)==0) {
printf("rx aa %d: %f, %f => %e, %e\n",
ii, rx_tmp.r, rx_tmp.i, rx_sig_re[ii][i-dd], rx_sig_im[ii][i-dd]);
}
#endif
//rx_sig_re[ii][i] = sqrt(.5)*(tx_sig_re[0][i] + tx_sig_re[1][i]);
//rx_sig_im[ii][i] = sqrt(.5)*(tx_sig_im[0][i] + tx_sig_im[1][i]);
} // ii
} // i
}
#endif
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