/*
* 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 1.0 (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
#include
#include
#include
#include
#include "PHY/TOOLS/defs.h"
#include "defs.h"
#include "scm_corrmat.h"
#include "UTIL/LOG/log.h"
//#define DEBUG_CH
extern void print_shorts(char *s,__m128i *x);
void fill_channel_desc(channel_desc_t *chan_desc,
uint8_t nb_tx,
uint8_t nb_rx,
uint8_t nb_taps,
uint8_t channel_length,
double *amps,
double *delays,
struct complex** R_sqrt,
double Td,
double sampling_rate,
double channel_bandwidth,
double ricean_factor,
double aoa,
double forgetting_factor,
double max_Doppler,
int32_t channel_offset,
double path_loss_dB,
uint8_t random_aoa)
{
uint16_t i,j;
double delta_tau;
LOG_I(OCM,"[CHANNEL] Getting new channel descriptor, nb_tx %d, nb_rx %d, nb_taps %d, channel_length %d\n",
nb_tx,nb_rx,nb_taps,channel_length);
chan_desc->nb_tx = nb_tx;
chan_desc->nb_rx = nb_rx;
chan_desc->nb_taps = nb_taps;
chan_desc->channel_length = channel_length;
chan_desc->amps = amps;
LOG_D(OCM,"[CHANNEL] Doing delays ...\n");
if (delays==NULL) {
chan_desc->delays = (double*) malloc(nb_taps*sizeof(double));
delta_tau = Td/nb_taps;
for (i=0; idelays[i] = ((double)i)*delta_tau;
}
else
chan_desc->delays = delays;
chan_desc->Td = Td;
chan_desc->sampling_rate = sampling_rate;
chan_desc->channel_bandwidth = channel_bandwidth;
chan_desc->ricean_factor = ricean_factor;
chan_desc->aoa = aoa;
chan_desc->random_aoa = random_aoa;
chan_desc->forgetting_factor = forgetting_factor;
chan_desc->channel_offset = channel_offset;
chan_desc->path_loss_dB = path_loss_dB;
chan_desc->first_run = 1;
chan_desc->ip = 0.0;
chan_desc->max_Doppler = max_Doppler;
chan_desc->ch = (struct complex**) malloc(nb_tx*nb_rx*sizeof(struct complex*));
chan_desc->chF = (struct complex**) malloc(nb_tx*nb_rx*sizeof(struct complex*));
chan_desc->a = (struct complex**) malloc(nb_taps*sizeof(struct complex*));
LOG_D(OCM,"[CHANNEL] Filling ch \n");
for (i = 0; ich[i] = (struct complex*) malloc(channel_length * sizeof(struct complex));
for (i = 0; ichF[i] = (struct complex*) malloc(1200 * sizeof(struct complex)); // allocate for up to 100 RBs, 12 samples per RB
LOG_D(OCM,"[CHANNEL] Filling a (nb_taps %d)\n",nb_taps);
for (i = 0; ia[i],nb_tx*nb_rx * sizeof(struct complex));
chan_desc->a[i] = (struct complex*) malloc(nb_tx*nb_rx * sizeof(struct complex));
}
LOG_D(OCM,"[CHANNEL] Doing R_sqrt ...\n");
if (R_sqrt == NULL) {
chan_desc->R_sqrt = (struct complex**) calloc(nb_taps,sizeof(struct complex*));
for (i = 0; iR_sqrt[i] = (struct complex*) calloc(nb_tx*nb_rx*nb_tx*nb_rx,sizeof(struct complex));
for (j = 0; jR_sqrt[i][j].x = 1.0;
chan_desc->R_sqrt[i][j].y = 0.0;
}
}
}
else {
chan_desc->R_sqrt = (struct complex**) calloc(nb_taps,sizeof(struct complex*));
for (i = 0; iR_sqrt[i] = (struct complex*) calloc(nb_tx*nb_rx*nb_tx*nb_rx,sizeof(struct complex));
//chan_desc->R_sqrt = (struct complex*)&R_sqrt[i][0];
/* all chan_desc share the same R_sqrt, coming from caller */
chan_desc->R_sqrt[i] = R_sqrt[0];
}
}
for (i = 0; iR_sqrt[i][j].x,chan_desc->R_sqrt[i][j].y);
}
}
LOG_D(OCM,"[CHANNEL] RF %f\n",chan_desc->ricean_factor);
for (i=0;inb_taps;i++)
LOG_D(OCM,"[CHANNEL] tap %d: amp %f, delay %f\n",i,chan_desc->amps[i],chan_desc->delays[i]);
chan_desc->nb_paths=10;
reset_meas(&chan_desc->random_channel);
reset_meas(&chan_desc->interp_time);
reset_meas(&chan_desc->interp_freq);
reset_meas(&chan_desc->convolution);
}
double mbsfn_delays[] = {0,.03,.15,.31,.37,1.09,12.490,12.52,12.64,12.80,12.86,13.58,27.49,27.52,27.64,27.80,27.86,28.58};
double mbsfn_amps_dB[] = {0,-1.5,-1.4,-3.6,-0.6,-7.0,-10,-11.5,-11.4,-13.6,-10.6,-17.0,-20,-21.5,-21.4,-23.6,-20.6,-27};
double scm_c_delays[] = {0, 0.0125, 0.0250, 0.3625, 0.3750, 0.3875, 0.2500, 0.2625, 0.2750, 1.0375, 1.0500, 1.0625, 2.7250, 2.7375, 2.7500, 4.6000, 4.6125, 4.6250};
double scm_c_amps_dB[] = {0.00, -2.22, -3.98, -1.86, -4.08, -5.84, -1.08, -3.30, -5.06, -9.08, -11.30, -13.06, -15.14, -17.36, -19.12, -20.64, -22.85, -24.62};
double epa_delays[] = { 0,.03,.07,.09,.11,.19,.41};
double epa_amps_dB[] = {0.0,-1.0,-2.0,-3.0,-8.0,-17.2,-20.8};
double eva_delays[] = { 0,.03,.15,.31,.37,.71,1.09,1.73,2.51};
double eva_amps_dB[] = {0.0,-1.5,-1.4,-3.6,-0.6,-9.1,-7.0,-12.0,-16.9};
double etu_delays[] = { 0,.05,.12,.2,.23,.5,1.6,2.3,5.0};
double etu_amps_dB[] = {-1.0,-1.0,-1.0,0.0,0.0,0.0,-3.0,-5.0,-7.0};
double default_amps_lin[] = {0.3868472 , 0.3094778 , 0.1547389 , 0.0773694 , 0.0386847 , 0.0193424 , 0.0096712 , 0.0038685};
double default_amp_lin[] = {1};
double ts_shift_delays[] = {0, 1/7.68};
double ts_shift_amps[] = {0, 1};
//correlation matrix for a 2x2 channel with full Tx correlation
struct complex R_sqrt_22_corr_tap[16] = {{0.70711,0}, {0.0, 0.0}, {0.70711,0}, {0.0, 0.0},
{0.0, 0.0}, {0.70711,0}, {0.0, 0.0}, {0.70711,0},
{0.70711,0}, {0.0, 0.0}, {0.70711,0}, {0.0, 0.0},
{0.0, 0.0}, {0.70711,0}, {0.0, 0.0}, {0.70711,0}};
struct complex *R_sqrt_22_corr[1] = {R_sqrt_22_corr_tap};
//correlation matrix for a fully correlated 2x1 channel (h1==h2)
struct complex R_sqrt_21_corr_tap[4] = {{0.70711,0}, {0.70711,0}, {0.70711,0}, {0.70711,0}};
struct complex *R_sqrt_21_corr[1] = {R_sqrt_21_corr_tap};
//correlation matrix for a 2x2 channel with full Tx anti-correlation
struct complex R_sqrt_22_anticorr_tap[16] = {{0.70711,0}, {0.0, 0.0}, {-0.70711,0}, {0.0, 0.0},
{0.0, 0.0}, {0.70711,0}, {0.0, 0.0}, {-0.70711,0},
{-0.70711,0}, {0.0, 0.0}, {0.70711,0}, {0.0, 0.0},
{0.0, 0.0}, {-0.70711,0}, {0.0, 0.0}, {0.70711,0}};
struct complex *R_sqrt_22_anticorr[1] = {R_sqrt_22_anticorr_tap};
//correlation matrix for a fully anti-correlated 2x1 channel (h1==-h2)
struct complex R_sqrt_21_anticorr_tap[4] = {{0.70711,0}, {-0.70711,0}, {-0.70711,0}, {0.70711,0}};
struct complex *R_sqrt_21_anticorr[1] = {R_sqrt_21_anticorr_tap};
struct complex **R_sqrt_ptr2;
// full correlation matrix in vectorized form for 2x2 channel, where h1 is perfectly orthogonal to h2
struct complex R_sqrt_22_orthogonal_tap[16] = {{0.70711,0.0}, {0.0, 0.0}, {0.0,0.0}, {0.0, 0.0},
{0.0, 0.0}, {0.0,0.0}, {0.0, 0.0}, {0.0,0.0},
{0.0,0.0}, {0.0, 0.0}, {0.0,0.0}, {0.0, 0.0},
{0.0, 0.0}, {0.0,0.0}, {0.0, 0.0}, {0.70711,0.0}};
struct complex *R_sqrt_22_orthogonal[1] = {R_sqrt_22_orthogonal_tap};
// full correlation matrix for TM4 to make orthogonal effective channel
struct complex R_sqrt_22_orth_eff_ch_TM4_prec_real_tap[16] = {{0.70711,0.0}, {0.0, 0.0}, {0.70711,0.0}, {0.0, 0.0},
{0.0, 0.0}, {0.70711,0.0}, {0.0, 0.0}, {-0.70711,0.0},
{0.70711,0.0}, {0.0, 0.0}, {0.70711,0.0}, {0.0, 0.0},
{0.0, 0.0}, {-0.70711,0.0}, {0.0, 0.0}, {0.70711,0.0}};
struct complex *R_sqrt_22_orth_eff_ch_TM4_prec_real[1] = {R_sqrt_22_orth_eff_ch_TM4_prec_real_tap};
struct complex R_sqrt_22_orth_eff_ch_TM4_prec_imag_tap[16] = {{0.70711,0.0}, {0.0,0.0}, {0.0, -0.70711}, {0.0,0.0},
{0.0, 0.0}, {0.70711,0.0}, {0.0, 0.0}, {0.0,0.70711},
{0.0,-0.70711}, {0.0, 0.0}, {-0.70711,0.0}, {0.0, 0.0},
{0.0, 0.0}, {0.0,0.70711}, {0.0, 0.0}, {-0.70711,0.0}};
struct complex *R_sqrt_22_orth_eff_ch_TM4_prec_imag[1] = {R_sqrt_22_orth_eff_ch_TM4_prec_imag_tap};
//Correlation matrix for EPA channel
struct complex R_sqrt_22_EPA_low_tap[16] = {{1.0,0.0}, {0.0,0.0}, {0.0,0.0}, {0.0,0.0},
{0.0,0.0}, {1.0,0.0}, {0.0,0.0}, {0.0,0.0},
{0.0,0.0}, {0.0,0.0}, {1.0,0.0}, {0.0,0.0},
{0.0,0.0}, {0.0,0.0}, {0.0,0.0}, {1.0,0.0}};
struct complex *R_sqrt_22_EPA_low[1] = {R_sqrt_22_EPA_low_tap};
struct complex R_sqrt_22_EPA_high_tap[16] = {{0.7179,0.0}, {0.4500,0.0}, {0.4500,0.0}, {0.2821,0.0},
{0.4500,0.0}, {0.7179,0.0}, {0.2821,0.0}, {0.4500,0.0},
{0.4500,0.0}, {0.2821,0.0}, {0.7179,0.0}, {0.4500,0.0},
{0.2821,0.0}, {0.4500,0.0}, {0.4500,0.0}, {0.7179,0.0}};
struct complex *R_sqrt_22_EPA_high[1] = {R_sqrt_22_EPA_high_tap};
struct complex R_sqrt_22_EPA_medium_tap[16] = {{0.8375,0.0}, {0.5249,0.0}, {0.1286,0.0}, {0.0806,0.0},
{0.5249,0.0}, {0.8375,0.0}, {0.0806,0.0}, {0.1286,0.0},
{0.1286,0.0}, {0.0806,0.0}, {0.8375,0.0}, {0.5249,0.0},
{0.0806,0.0}, {0.1286,0.0}, {0.5249,0.0}, {0.8375,0.0}};
struct complex *R_sqrt_22_EPA_medium[1] = {R_sqrt_22_EPA_medium_tap};
//Rayleigh1_orth_eff_ch_TM4
channel_desc_t *new_channel_desc_scm(uint8_t nb_tx,
uint8_t nb_rx,
SCM_t channel_model,
double sampling_rate,
double channel_bandwidth,
double forgetting_factor,
int32_t channel_offset,
double path_loss_dB)
{
channel_desc_t *chan_desc = (channel_desc_t *)malloc(sizeof(channel_desc_t));
uint16_t i,j;
double sum_amps;
double aoa,ricean_factor,Td,maxDoppler;
int channel_length,nb_taps;
chan_desc->nb_tx = nb_tx;
chan_desc->nb_rx = nb_rx;
chan_desc->sampling_rate = sampling_rate;
chan_desc->channel_bandwidth = channel_bandwidth;
chan_desc->forgetting_factor = forgetting_factor;
chan_desc->channel_offset = channel_offset;
chan_desc->path_loss_dB = path_loss_dB;
chan_desc->first_run = 1;
chan_desc->ip = 0.0;
LOG_I(OCM,"Channel Model (inside of new_channel_desc_scm)=%d\n\n", channel_model);
switch (channel_model) {
case SCM_A:
LOG_W(OCM,"channel model not yet supported\n");
free(chan_desc);
return(NULL);
case SCM_B:
LOG_W(OCM,"channel model not yet supported\n");
free(chan_desc);
return(NULL);
case SCM_C:
chan_desc->nb_taps = 18;
chan_desc->Td = 4.625;
chan_desc->channel_length = (int) (2*chan_desc->sampling_rate*chan_desc->Td + 1 + 2/(M_PI*M_PI)*log(4*M_PI*chan_desc->sampling_rate*chan_desc->Td));
sum_amps = 0;
chan_desc->amps = (double*) malloc(chan_desc->nb_taps*sizeof(double));
for (i = 0; inb_taps; i++) {
chan_desc->amps[i] = pow(10,.1*scm_c_amps_dB[i]);
sum_amps += chan_desc->amps[i];
}
for (i = 0; inb_taps; i++)
chan_desc->amps[i] /= sum_amps;
chan_desc->delays = scm_c_delays;
chan_desc->ricean_factor = 1;
chan_desc->aoa = 0;
chan_desc->random_aoa = 0;
chan_desc->ch = (struct complex**) malloc(nb_tx*nb_rx*sizeof(struct complex*));
chan_desc->chF = (struct complex**) malloc(nb_tx*nb_rx*sizeof(struct complex*));
chan_desc->a = (struct complex**) malloc(chan_desc->nb_taps*sizeof(struct complex*));
for (i = 0; ich[i] = (struct complex*) malloc(chan_desc->channel_length * sizeof(struct complex));
for (i = 0; ichF[i] = (struct complex*) malloc(1200 * sizeof(struct complex));
for (i = 0; inb_taps; i++)
chan_desc->a[i] = (struct complex*) malloc(nb_tx*nb_rx * sizeof(struct complex));
chan_desc->R_sqrt = (struct complex**) malloc(6*sizeof(struct complex**));
if (nb_tx==2 && nb_rx==2) {
for (i = 0; i<6; i++)
chan_desc->R_sqrt[i] = (struct complex*) &R22_sqrt[i][0];
}
else if (nb_tx==2 && nb_rx==1) {
for (i = 0; i<6; i++)
chan_desc->R_sqrt[i] = (struct complex*) &R21_sqrt[i][0];
}
else if (nb_tx==1 && nb_rx==2) {
for (i = 0; i<6; i++)
chan_desc->R_sqrt[i] = (struct complex*) &R12_sqrt[i][0];
}
else {
for (i = 0; i<6; i++) {
chan_desc->R_sqrt[i] = (struct complex*) malloc(nb_tx*nb_rx*nb_tx*nb_rx * sizeof(struct complex));
for (j = 0; jR_sqrt[i][j].x = 1.0;
chan_desc->R_sqrt[i][j].y = 0.0;
}
LOG_W(OCM,"correlation matrix not implemented for nb_tx==%d and nb_rx==%d, using identity\n", nb_tx, nb_rx);
}
}
break;
case SCM_D:
LOG_W(OCM,"This is not the real SCM-D model! It is just SCM-C with an additional Rice factor!\n");
chan_desc->nb_taps = 18;
chan_desc->Td = 4.625;
chan_desc->channel_length = (int) (2*chan_desc->sampling_rate*chan_desc->Td + 1 + 2/(M_PI*M_PI)*log(4*M_PI*chan_desc->sampling_rate*chan_desc->Td));
sum_amps = 0;
chan_desc->amps = (double*) malloc(chan_desc->nb_taps*sizeof(double));
for (i = 0; inb_taps; i++) {
chan_desc->amps[i] = pow(10,.1*scm_c_amps_dB[i]);
sum_amps += chan_desc->amps[i];
}
for (i = 0; inb_taps; i++)
chan_desc->amps[i] /= sum_amps;
chan_desc->delays = scm_c_delays;
chan_desc->ricean_factor = 0.1;
chan_desc->aoa = 0;
chan_desc->random_aoa = 0;
chan_desc->ch = (struct complex**) malloc(nb_tx*nb_rx*sizeof(struct complex*));
chan_desc->chF = (struct complex**) malloc(nb_tx*nb_rx*sizeof(struct complex*));
chan_desc->a = (struct complex**) malloc(chan_desc->nb_taps*sizeof(struct complex*));
for (i = 0; ich[i] = (struct complex*) malloc(chan_desc->channel_length * sizeof(struct complex));
for (i = 0; ichF[i] = (struct complex*) malloc(1200 * sizeof(struct complex));
for (i = 0; inb_taps; i++)
chan_desc->a[i] = (struct complex*) malloc(nb_tx*nb_rx * sizeof(struct complex));
chan_desc->R_sqrt = (struct complex**) malloc(6*sizeof(struct complex**));
if (nb_tx==2 && nb_rx==2) {
for (i = 0; i<6; i++)
chan_desc->R_sqrt[i] = (struct complex*) &R22_sqrt[i][0];
}
else if (nb_tx==2 && nb_rx==1) {
for (i = 0; i<6; i++)
chan_desc->R_sqrt[i] = (struct complex*) &R21_sqrt[i][0];
}
else if (nb_tx==1 && nb_rx==2) {
for (i = 0; i<6; i++)
chan_desc->R_sqrt[i] = (struct complex*) &R12_sqrt[i][0];
}
else {
for (i = 0; i<6; i++) {
chan_desc->R_sqrt[i] = (struct complex*) malloc(nb_tx*nb_rx*nb_tx*nb_rx * sizeof(struct complex));
for (j = 0; jR_sqrt[i][j].x = 1.0;
chan_desc->R_sqrt[i][j].y = 0.0;
}
LOG_W(OCM,"correlation matrix not implemented for nb_tx==%d and nb_rx==%d, using identity\n", nb_tx, nb_rx);
}
}
break;
case EPA:
chan_desc->nb_taps = 7;
chan_desc->Td = .410;
chan_desc->channel_length = (int) (2*chan_desc->sampling_rate*chan_desc->Td + 1 + 2/(M_PI*M_PI)*log(4*M_PI*chan_desc->sampling_rate*chan_desc->Td));
sum_amps = 0;
chan_desc->amps = (double*) malloc(chan_desc->nb_taps*sizeof(double));
for (i = 0; inb_taps; i++) {
chan_desc->amps[i] = pow(10,.1*epa_amps_dB[i]);
sum_amps += chan_desc->amps[i];
}
for (i = 0; inb_taps; i++)
chan_desc->amps[i] /= sum_amps;
chan_desc->delays = epa_delays;
chan_desc->ricean_factor = 1;
chan_desc->aoa = 0;
chan_desc->random_aoa = 0;
chan_desc->ch = (struct complex**) malloc(nb_tx*nb_rx*sizeof(struct complex*));
chan_desc->chF = (struct complex**) malloc(nb_tx*nb_rx*sizeof(struct complex*));
chan_desc->a = (struct complex**) malloc(chan_desc->nb_taps*sizeof(struct complex*));
for (i = 0; ich[i] = (struct complex*) malloc(chan_desc->channel_length * sizeof(struct complex));
for (i = 0; ichF[i] = (struct complex*) malloc(1200 * sizeof(struct complex));
for (i = 0; inb_taps; i++)
chan_desc->a[i] = (struct complex*) malloc(nb_tx*nb_rx * sizeof(struct complex));
if (nb_tx==2 && nb_rx==2) {
chan_desc->R_sqrt = (struct complex**) malloc(6*sizeof(struct complex**));
for (i = 0; i<6; i++)
chan_desc->R_sqrt[i] = (struct complex*) &R22_sqrt[i][0];
}
else {
chan_desc->R_sqrt = (struct complex**) malloc(6*sizeof(struct complex**));
for (i = 0; i<6; i++) {
chan_desc->R_sqrt[i] = (struct complex*) malloc(nb_tx*nb_rx*nb_tx*nb_rx * sizeof(struct complex));
for (j = 0; jR_sqrt[i][j].x = 1.0;
chan_desc->R_sqrt[i][j].y = 0.0;
}
LOG_W(OCM,"correlation matrix only implemented for nb_tx==2 and nb_rx==2, using identity\n");
}
}
break;
case EPA_low:
chan_desc->nb_taps = 7;
chan_desc->Td = .410;
chan_desc->channel_length = (int) (2*chan_desc->sampling_rate*chan_desc->Td + 1 + 2/(M_PI*M_PI)*log(4*M_PI*chan_desc->sampling_rate*chan_desc->Td));
sum_amps = 0;
chan_desc->amps = (double*) malloc(chan_desc->nb_taps*sizeof(double));
for (i = 0; inb_taps; i++) {
chan_desc->amps[i] = pow(10,.1*epa_amps_dB[i]);
sum_amps += chan_desc->amps[i];
}
for (i = 0; inb_taps; i++)
chan_desc->amps[i] /= sum_amps;
chan_desc->delays = epa_delays;
chan_desc->ricean_factor = 1;
chan_desc->aoa = 0;
chan_desc->random_aoa = 0;
chan_desc->ch = (struct complex**) malloc(nb_tx*nb_rx*sizeof(struct complex*));
chan_desc->chF = (struct complex**) malloc(nb_tx*nb_rx*sizeof(struct complex*));
chan_desc->a = (struct complex**) malloc(chan_desc->nb_taps*sizeof(struct complex*));
for (i = 0; ich[i] = (struct complex*) malloc(chan_desc->channel_length * sizeof(struct complex));
for (i = 0; ichF[i] = (struct complex*) malloc(1200 * sizeof(struct complex));
for (i = 0; inb_taps; i++)
chan_desc->a[i] = (struct complex*) malloc(nb_tx*nb_rx * sizeof(struct complex));
if (nb_tx==2 && nb_rx==2) {
chan_desc->R_sqrt = (struct complex**) malloc(chan_desc->nb_taps*sizeof(struct complex**));
for (i = 0; inb_taps; i++)
chan_desc->R_sqrt[i] = R_sqrt_22_EPA_low[0];
}
else {
printf("Correlation matrices are implemented for 2 x 2 only");
}
/*else {
chan_desc->R_sqrt = (struct complex**) malloc(6*sizeof(struct complex**));
for (i = 0; i<6; i++) {
chan_desc->R_sqrt[i] = (struct complex*) malloc(nb_tx*nb_rx*nb_tx*nb_rx * sizeof(struct complex));
for (j = 0; jR_sqrt[i][j].x = 1.0;
chan_desc->R_sqrt[i][j].y = 0.0;
}
LOG_W(OCM,"correlation matrix only implemented for nb_tx==2 and nb_rx==2, using identity\n");
}
}*/
break;
case EPA_high:
chan_desc->nb_taps = 7;
chan_desc->Td = .410;
chan_desc->channel_length = (int) (2*chan_desc->sampling_rate*chan_desc->Td + 1 + 2/(M_PI*M_PI)*log(4*M_PI*chan_desc->sampling_rate*chan_desc->Td));
sum_amps = 0;
chan_desc->amps = (double*) malloc(chan_desc->nb_taps*sizeof(double));
for (i = 0; inb_taps; i++) {
chan_desc->amps[i] = pow(10,.1*epa_amps_dB[i]);
sum_amps += chan_desc->amps[i];
}
for (i = 0; inb_taps; i++)
chan_desc->amps[i] /= sum_amps;
chan_desc->delays = epa_delays;
chan_desc->ricean_factor = 1;
chan_desc->aoa = 0;
chan_desc->random_aoa = 0;
chan_desc->ch = (struct complex**) malloc(nb_tx*nb_rx*sizeof(struct complex*));
chan_desc->chF = (struct complex**) malloc(nb_tx*nb_rx*sizeof(struct complex*));
chan_desc->a = (struct complex**) malloc(chan_desc->nb_taps*sizeof(struct complex*));
for (i = 0; ich[i] = (struct complex*) malloc(chan_desc->channel_length * sizeof(struct complex));
for (i = 0; ichF[i] = (struct complex*) malloc(1200 * sizeof(struct complex));
for (i = 0; inb_taps; i++)
chan_desc->a[i] = (struct complex*) malloc(nb_tx*nb_rx * sizeof(struct complex));
if (nb_tx==2 && nb_rx==2) {
chan_desc->R_sqrt = (struct complex**) malloc(chan_desc->nb_taps*sizeof(struct complex**));
for (i = 0; inb_taps; i++)
chan_desc->R_sqrt[i] = R_sqrt_22_EPA_high[0];
}
else {
printf("Correlation matrices are implemented for 2 x 2 only");
}
/*else {
chan_desc->R_sqrt = (struct complex**) malloc(6*sizeof(struct complex**));
for (i = 0; i<6; i++) {
chan_desc->R_sqrt[i] = (struct complex*) malloc(nb_tx*nb_rx*nb_tx*nb_rx * sizeof(struct complex));
for (j = 0; jR_sqrt[i][j].x = 1.0;
chan_desc->R_sqrt[i][j].y = 0.0;
}
LOG_W(OCM,"correlation matrix only implemented for nb_tx==2 and nb_rx==2, using identity\n");
}
}*/
break;
case EPA_medium:
chan_desc->nb_taps = 7;
chan_desc->Td = .410;
chan_desc->channel_length = (int) (2*chan_desc->sampling_rate*chan_desc->Td + 1 + 2/(M_PI*M_PI)*log(4*M_PI*chan_desc->sampling_rate*chan_desc->Td));
sum_amps = 0;
chan_desc->amps = (double*) malloc(chan_desc->nb_taps*sizeof(double));
for (i = 0; inb_taps; i++) {
chan_desc->amps[i] = pow(10,.1*epa_amps_dB[i]);
sum_amps += chan_desc->amps[i];
}
for (i = 0; inb_taps; i++)
chan_desc->amps[i] /= sum_amps;
chan_desc->delays = epa_delays;
chan_desc->ricean_factor = 1;
chan_desc->aoa = 0;
chan_desc->random_aoa = 0;
chan_desc->ch = (struct complex**) malloc(nb_tx*nb_rx*sizeof(struct complex*));
chan_desc->chF = (struct complex**) malloc(nb_tx*nb_rx*sizeof(struct complex*));
chan_desc->a = (struct complex**) malloc(chan_desc->nb_taps*sizeof(struct complex*));
for (i = 0; ich[i] = (struct complex*) malloc(chan_desc->channel_length * sizeof(struct complex));
for (i = 0; ichF[i] = (struct complex*) malloc(1200 * sizeof(struct complex));
for (i = 0; inb_taps; i++)
chan_desc->a[i] = (struct complex*) malloc(nb_tx*nb_rx * sizeof(struct complex));
if (nb_tx==2 && nb_rx==2) {
chan_desc->R_sqrt = (struct complex**) malloc(chan_desc->nb_taps*sizeof(struct complex**));
for (i = 0; inb_taps; i++)
chan_desc->R_sqrt[i] = R_sqrt_22_EPA_medium[0];
} else {
printf("Correlation matrices are implemented for 2 x 2 only");
}
/*else {
chan_desc->R_sqrt = (struct complex**) malloc(6*sizeof(struct complex**));
for (i = 0; i<6; i++) {
chan_desc->R_sqrt[i] = (struct complex*) malloc(nb_tx*nb_rx*nb_tx*nb_rx * sizeof(struct complex));
for (j = 0; jR_sqrt[i][j].x = 1.0;
chan_desc->R_sqrt[i][j].y = 0.0;
}
LOG_W(OCM,"correlation matrix only implemented for nb_tx==2 and nb_rx==2, using identity\n");
}
}*/
break;
case EVA:
chan_desc->nb_taps = 9;
chan_desc->Td = 2.51;
chan_desc->channel_length = (int) (2*chan_desc->sampling_rate*chan_desc->Td + 1 + 2/(M_PI*M_PI)*log(4*M_PI*chan_desc->sampling_rate*chan_desc->Td));
sum_amps = 0;
chan_desc->amps = (double*) malloc(chan_desc->nb_taps*sizeof(double));
for (i = 0; inb_taps; i++) {
chan_desc->amps[i] = pow(10,.1*eva_amps_dB[i]);
sum_amps += chan_desc->amps[i];
}
for (i = 0; inb_taps; i++)
chan_desc->amps[i] /= sum_amps;
chan_desc->delays = eva_delays;
chan_desc->ricean_factor = 1;
chan_desc->aoa = 0;
chan_desc->random_aoa = 0;
chan_desc->ch = (struct complex**) malloc(nb_tx*nb_rx*sizeof(struct complex*));
chan_desc->chF = (struct complex**) malloc(nb_tx*nb_rx*sizeof(struct complex*));
chan_desc->a = (struct complex**) malloc(chan_desc->nb_taps*sizeof(struct complex*));
for (i = 0; ich[i] = (struct complex*) malloc(chan_desc->channel_length * sizeof(struct complex));
for (i = 0; ichF[i] = (struct complex*) malloc(1200 * sizeof(struct complex));
for (i = 0; inb_taps; i++)
chan_desc->a[i] = (struct complex*) malloc(nb_tx*nb_rx * sizeof(struct complex));
if (nb_tx==2 && nb_rx==2) {
chan_desc->R_sqrt = (struct complex**) malloc(6*sizeof(struct complex**));
for (i = 0; i<6; i++)
chan_desc->R_sqrt[i] = (struct complex*) &R22_sqrt[i][0];
}
else {
chan_desc->R_sqrt = (struct complex**) malloc(6*sizeof(struct complex**));
for (i = 0; i<6; i++) {
chan_desc->R_sqrt[i] = (struct complex*) malloc(nb_tx*nb_rx*nb_tx*nb_rx * sizeof(struct complex));
for (j = 0; jR_sqrt[i][j].x = 1.0;
chan_desc->R_sqrt[i][j].y = 0.0;
}
LOG_W(OCM,"correlation matrix only implemented for nb_tx==2 and nb_rx==2, using identity\n");
}
}
break;
case ETU:
chan_desc->nb_taps = 9;
chan_desc->Td = 5.0;
chan_desc->channel_length = (int) (2*chan_desc->sampling_rate*chan_desc->Td + 1 + 2/(M_PI*M_PI)*log(4*M_PI*chan_desc->sampling_rate*chan_desc->Td));
sum_amps = 0;
chan_desc->amps = (double*) malloc(chan_desc->nb_taps*sizeof(double));
for (i = 0; inb_taps; i++) {
chan_desc->amps[i] = pow(10,.1*etu_amps_dB[i]);
sum_amps += chan_desc->amps[i];
}
for (i = 0; inb_taps; i++)
chan_desc->amps[i] /= sum_amps;
chan_desc->delays = etu_delays;
chan_desc->ricean_factor = 1;
chan_desc->aoa = 0;
chan_desc->random_aoa = 0;
chan_desc->ch = (struct complex**) malloc(nb_tx*nb_rx*sizeof(struct complex*));
chan_desc->chF = (struct complex**) malloc(nb_tx*nb_rx*sizeof(struct complex*));
chan_desc->a = (struct complex**) malloc(chan_desc->nb_taps*sizeof(struct complex*));
for (i = 0; ich[i] = (struct complex*) malloc(chan_desc->channel_length * sizeof(struct complex));
for (i = 0; ichF[i] = (struct complex*) malloc(1200 * sizeof(struct complex));
for (i = 0; inb_taps; i++)
chan_desc->a[i] = (struct complex*) malloc(nb_tx*nb_rx * sizeof(struct complex));
if (nb_tx==2 && nb_rx==2) {
chan_desc->R_sqrt = (struct complex**) malloc(6*sizeof(struct complex**));
for (i = 0; i<6; i++)
chan_desc->R_sqrt[i] = (struct complex*) &R22_sqrt[i][0];
}
else {
chan_desc->R_sqrt = (struct complex**) malloc(6*sizeof(struct complex**));
for (i = 0; i<6; i++) {
chan_desc->R_sqrt[i] = (struct complex*) malloc(nb_tx*nb_rx*nb_tx*nb_rx * sizeof(struct complex));
for (j = 0; jR_sqrt[i][j].x = 1.0;
chan_desc->R_sqrt[i][j].y = 0.0;
}
LOG_W(OCM,"correlation matrix only implemented for nb_tx==2 and nb_rx==2, using identity\n");
}
}
break;
case MBSFN:
chan_desc->nb_taps = 18;
chan_desc->Td = 28.58;
chan_desc->channel_length = (int) (2*chan_desc->sampling_rate*chan_desc->Td + 1 + 2/(M_PI*M_PI)*log(4*M_PI*chan_desc->sampling_rate*chan_desc->Td));
sum_amps = 0;
chan_desc->amps = (double*) malloc(chan_desc->nb_taps*sizeof(double));
for (i = 0; inb_taps; i++) {
chan_desc->amps[i] = pow(10,.1*mbsfn_amps_dB[i]);
sum_amps += chan_desc->amps[i];
}
for (i = 0; inb_taps; i++)
chan_desc->amps[i] /= sum_amps;
chan_desc->delays = mbsfn_delays;
chan_desc->ricean_factor = 1;
chan_desc->aoa = 0;
chan_desc->random_aoa = 0;
chan_desc->ch = (struct complex**) malloc(nb_tx*nb_rx*sizeof(struct complex*));
chan_desc->chF = (struct complex**) malloc(nb_tx*nb_rx*sizeof(struct complex*));
chan_desc->a = (struct complex**) malloc(chan_desc->nb_taps*sizeof(struct complex*));
for (i = 0; ich[i] = (struct complex*) malloc(chan_desc->channel_length * sizeof(struct complex));
for (i = 0; ichF[i] = (struct complex*) malloc(1200 * sizeof(struct complex));
for (i = 0; inb_taps; i++)
chan_desc->a[i] = (struct complex*) malloc(nb_tx*nb_rx * sizeof(struct complex));
chan_desc->R_sqrt = (struct complex**) malloc(6*sizeof(struct complex*));
for (i = 0; i<6; i++) {
chan_desc->R_sqrt[i] = (struct complex*) malloc(nb_tx*nb_rx*nb_tx*nb_rx * sizeof(struct complex));
for (j = 0; jR_sqrt[i][j].x = 1.0;
chan_desc->R_sqrt[i][j].y = 0.0;
}
LOG_W(OCM,"correlation matrix only implemented for nb_tx==2 and nb_rx==2, using identity\n");
}
break;
case Rayleigh8:
nb_taps = 8;
Td = 0.8;
channel_length = (int)11+2*sampling_rate*Td;
ricean_factor = 1;
aoa = .03;
maxDoppler = 0;
fill_channel_desc(chan_desc,
nb_tx,
nb_rx,
nb_taps,
channel_length,
default_amps_lin,
NULL,
NULL,
Td,
sampling_rate,
channel_bandwidth,
ricean_factor,
aoa,
forgetting_factor,
maxDoppler,
channel_offset,
path_loss_dB,
0);
break;
case Rice8:
nb_taps = 8;
Td = 0.8;
channel_length = (int)11+2*sampling_rate*Td;
ricean_factor = 0.1;
aoa = 0.7854;
maxDoppler = 0;
fill_channel_desc(chan_desc,nb_tx,
nb_rx,
nb_taps,
channel_length,
default_amps_lin,
NULL,
NULL,
Td,
sampling_rate,
channel_bandwidth,
ricean_factor,
aoa,
forgetting_factor,
maxDoppler,
channel_offset,
path_loss_dB,
1);
break;
case Rayleigh1:
nb_taps = 1;
Td = 0;
channel_length = 1;
ricean_factor = 1;
aoa = .03;
maxDoppler = 0;
fill_channel_desc(chan_desc,nb_tx,
nb_rx,
nb_taps,
channel_length,
default_amp_lin,
NULL,
NULL,
Td,
sampling_rate,
channel_bandwidth,
ricean_factor,
aoa,
forgetting_factor,
maxDoppler,
channel_offset,
path_loss_dB,
0);
break;
case Rayleigh1_800:
nb_taps = 1;
Td = 0;
channel_length = 1;
ricean_factor = 1;
aoa = .03;
maxDoppler = 800;
fill_channel_desc(chan_desc,nb_tx,
nb_rx,
nb_taps,
channel_length,
default_amp_lin,
NULL,
NULL,
Td,
sampling_rate,
channel_bandwidth,
ricean_factor,
aoa,
forgetting_factor,
maxDoppler,
channel_offset,
path_loss_dB,
0);
break;
case Rayleigh1_corr:
nb_taps = 1;
Td = 0;
channel_length = 1;
ricean_factor = 1;
aoa = .03;
maxDoppler = 0;
if ((nb_tx==2) && (nb_rx==1)) {
R_sqrt_ptr2 = R_sqrt_21_corr;
}
else if ((nb_tx==2) && (nb_rx==2)) {
R_sqrt_ptr2 = R_sqrt_22_corr;
}
else
R_sqrt_ptr2 = NULL;
fill_channel_desc(chan_desc,nb_tx,
nb_rx,
nb_taps,
channel_length,
default_amp_lin,
NULL,
R_sqrt_ptr2,
Td,
sampling_rate,
channel_bandwidth,
ricean_factor,
aoa,
forgetting_factor,
maxDoppler,
channel_offset,
path_loss_dB,
0);
break;
case Rayleigh1_anticorr:
nb_taps = 1;
Td = 0;
channel_length = 1;
ricean_factor = 1;
aoa = .03;
maxDoppler = 0;
if ((nb_tx==2) && (nb_rx==1)) { //check this
R_sqrt_ptr2 = R_sqrt_21_anticorr;
}
else if ((nb_tx==2) && (nb_rx==2)) {
R_sqrt_ptr2 = R_sqrt_22_anticorr;
}
else
R_sqrt_ptr2 = NULL;
fill_channel_desc(chan_desc,nb_tx,
nb_rx,
nb_taps,
channel_length,
default_amp_lin,
NULL,
R_sqrt_ptr2,
Td,
sampling_rate,
channel_bandwidth,
ricean_factor,
aoa,
forgetting_factor,
maxDoppler,
channel_offset,
path_loss_dB,
0);
break;
case Rice1:
nb_taps = 1;
Td = 0;
channel_length = 1;
ricean_factor = 0.1;
aoa = 0.7854;
maxDoppler = 0;
fill_channel_desc(chan_desc,nb_tx,
nb_rx,
nb_taps,
channel_length,
default_amp_lin,
NULL,
NULL,
Td,
sampling_rate,
channel_bandwidth,
ricean_factor,
aoa,
forgetting_factor,
maxDoppler,
channel_offset,
path_loss_dB,
0);
break;
case AWGN:
nb_taps = 1;
Td = 0;
channel_length = 1;
ricean_factor = 0.0;
aoa = 0.0;
maxDoppler = 0;
fill_channel_desc(chan_desc,nb_tx,
nb_rx,
nb_taps,
channel_length,
default_amp_lin,
NULL,
NULL,
Td,
sampling_rate,
channel_bandwidth,
ricean_factor,
aoa,
forgetting_factor,
maxDoppler,
channel_offset,
path_loss_dB,
0);
printf("AWGN: ricean_factor %f\n",chan_desc->ricean_factor);
break;
case TS_SHIFT:
nb_taps = 2;
Td = ts_shift_delays[1];
channel_length = 10;
ricean_factor = 0.0;
aoa = 0.0;
maxDoppler = 0;
fill_channel_desc(chan_desc,nb_tx,
nb_rx,
nb_taps,
channel_length,
ts_shift_amps,
ts_shift_delays,
NULL,
Td,
sampling_rate,
channel_bandwidth,
ricean_factor,
aoa,
forgetting_factor,
maxDoppler,
channel_offset,
path_loss_dB,
0);
printf("TS_SHIFT: ricean_factor %f\n",chan_desc->ricean_factor);
break;
case Rice1_corr:
nb_taps = 1;
Td = 0;
channel_length = 1;
ricean_factor = 0.1;
aoa = .03;
maxDoppler = 0;
if ((nb_tx==2) && (nb_rx==1)) {
R_sqrt_ptr2 = R_sqrt_21_corr;
}
else if ((nb_tx==2) && (nb_rx==2)) {
R_sqrt_ptr2 = R_sqrt_22_corr;
}
else
R_sqrt_ptr2 = NULL;
fill_channel_desc(chan_desc,nb_tx,
nb_rx,
nb_taps,
channel_length,
default_amp_lin,
NULL,
R_sqrt_ptr2,
Td,
sampling_rate,
channel_bandwidth,
ricean_factor,
aoa,
forgetting_factor,
maxDoppler,
channel_offset,
path_loss_dB,
1);
break;
case Rice1_anticorr:
nb_taps = 1;
Td = 0;
channel_length = 1;
ricean_factor = 0.1;
aoa = .03;
maxDoppler = 0;
if ((nb_tx==2) && (nb_rx==1)) {
R_sqrt_ptr2 = R_sqrt_21_anticorr;
}
else if ((nb_tx==2) && (nb_rx==2)) {
R_sqrt_ptr2 = R_sqrt_22_anticorr;
}
else
R_sqrt_ptr2 = NULL;
fill_channel_desc(chan_desc,nb_tx,
nb_rx,
nb_taps,
channel_length,
default_amp_lin,
NULL,
R_sqrt_ptr2,
Td,
sampling_rate,
channel_bandwidth,
ricean_factor,
aoa,
forgetting_factor,
maxDoppler,
channel_offset,
path_loss_dB,
1);
break;
case Rayleigh1_orthogonal:
nb_taps = 1;
Td = 0;
channel_length = 1;
ricean_factor = 1;
aoa = 0.03;
maxDoppler = 0;
if ((nb_tx==2) && (nb_rx==2)) {
R_sqrt_ptr2 = R_sqrt_22_orthogonal;
}
else
R_sqrt_ptr2 = NULL;
fill_channel_desc(chan_desc,nb_tx,
nb_rx,
nb_taps,
channel_length,
default_amp_lin,
NULL,
R_sqrt_ptr2,
Td,
sampling_rate,
channel_bandwidth,
ricean_factor,
aoa,
forgetting_factor,
maxDoppler,
channel_offset,
path_loss_dB,
0);
break;
case Rayleigh1_orth_eff_ch_TM4_prec_real:
nb_taps = 1;
Td = 0;
channel_length = 1;
ricean_factor = 1;
aoa = 0.03;
maxDoppler = 0;
if ((nb_tx==2) && (nb_rx==2)) {
R_sqrt_ptr2 = R_sqrt_22_orth_eff_ch_TM4_prec_real;
}
else
R_sqrt_ptr2 = NULL;
fill_channel_desc(chan_desc,nb_tx,
nb_rx,
nb_taps,
channel_length,
default_amp_lin,
NULL,
R_sqrt_ptr2,
Td,
sampling_rate,
channel_bandwidth,
ricean_factor,
aoa,
forgetting_factor,
maxDoppler,
channel_offset,
path_loss_dB,
1);
break;
case Rayleigh1_orth_eff_ch_TM4_prec_imag:
nb_taps = 1;
Td = 0;
channel_length = 1;
ricean_factor = 1;
aoa = 0.03;
maxDoppler = 0;
if ((nb_tx==2) && (nb_rx==2)) {
R_sqrt_ptr2 = R_sqrt_22_orth_eff_ch_TM4_prec_imag;
}
else
R_sqrt_ptr2 = NULL;
fill_channel_desc(chan_desc,nb_tx,
nb_rx,
nb_taps,
channel_length,
default_amp_lin,
NULL,
R_sqrt_ptr2,
Td,
sampling_rate,
channel_bandwidth,
ricean_factor,
aoa,
forgetting_factor,
maxDoppler,
channel_offset,
path_loss_dB,
0);
break;
case Rayleigh8_orth_eff_ch_TM4_prec_real:
if ((nb_tx==2) && (nb_rx==2)) {
R_sqrt_ptr2 = R_sqrt_22_orth_eff_ch_TM4_prec_real;
//R_sqrt_ptr2 = NULL;
}
else
R_sqrt_ptr2 = NULL;
nb_taps = 8;
Td = 0.8;
channel_length = (int)11+2*sampling_rate*Td;
ricean_factor = 1;
aoa = .03;
maxDoppler = 0;
fill_channel_desc(chan_desc,
nb_tx,
nb_rx,
nb_taps,
channel_length,
default_amps_lin,
NULL,
R_sqrt_ptr2,
Td,
sampling_rate,
channel_bandwidth,
ricean_factor,
aoa,
forgetting_factor,
maxDoppler,
channel_offset,
path_loss_dB,
0);
break;
case Rayleigh8_orth_eff_ch_TM4_prec_imag:
nb_taps = 8;
Td = 0.8;
channel_length = (int)11+2*sampling_rate*Td;
ricean_factor = 1;
aoa = .03;
maxDoppler = 0;
if ((nb_tx==2) && (nb_rx==2)) {
R_sqrt_ptr2 = R_sqrt_22_orth_eff_ch_TM4_prec_imag;
}
else
R_sqrt_ptr2 = NULL;
fill_channel_desc(chan_desc,
nb_tx,
nb_rx,
nb_taps,
channel_length,
default_amps_lin,
NULL,
R_sqrt_ptr2,
Td,
sampling_rate,
channel_bandwidth,
ricean_factor,
aoa,
forgetting_factor,
maxDoppler,
channel_offset,
path_loss_dB,
0);
break;
default:
LOG_W(OCM,"channel model not yet supported\n");
free(chan_desc);
return(NULL);
}
LOG_D(OCM,"[CHANNEL] RF %f\n",chan_desc->ricean_factor);
for (i=0;inb_taps;i++)
LOG_D(OCM,"[CHANNEL] tap %d: amp %f, delay %f\n",i,chan_desc->amps[i],chan_desc->delays[i]);
chan_desc->nb_paths = 10;
return(chan_desc);
}
int random_channel(channel_desc_t *desc, uint8_t abstraction_flag) {
double s;
int i,k,l,aarx,aatx;
struct complex anew[NB_ANTENNAS_TX*NB_ANTENNAS_RX],acorr[NB_ANTENNAS_TX*NB_ANTENNAS_RX];
struct complex phase, alpha, beta;
if ((desc->nb_tx>NB_ANTENNAS_TX) || (desc->nb_rx > NB_ANTENNAS_RX)) {
msg("random_channel.c: Error: temporary buffer for channel not big enough (%d,%d)\n",desc->nb_tx,desc->nb_rx);
return(-1);
}
start_meas(&desc->random_channel);
for (i=0;i<(int)desc->nb_taps;i++) {
for (aarx=0;aarxnb_rx;aarx++) {
for (aatx=0;aatxnb_tx;aatx++) {
anew[aarx+(aatx*desc->nb_rx)].x = sqrt(desc->ricean_factor*desc->amps[i]/2) * gaussdouble(0.0,1.0);
anew[aarx+(aatx*desc->nb_rx)].y = sqrt(desc->ricean_factor*desc->amps[i]/2) * gaussdouble(0.0,1.0);
if ((i==0) && (desc->ricean_factor != 1.0)) {
if (desc->random_aoa==1) {
desc->aoa = uniformrandom()*2*M_PI;
}
// this assumes that both RX and TX have linear antenna arrays with lambda/2 antenna spacing.
// Furhter it is assumed that the arrays are parallel to each other and that they are far enough apart so
// that we can safely assume plane wave propagation.
phase.x = cos(M_PI*((aarx-aatx)*sin(desc->aoa)));
phase.y = sin(M_PI*((aarx-aatx)*sin(desc->aoa)));
anew[aarx+(aatx*desc->nb_rx)].x += phase.x * sqrt(1.0-desc->ricean_factor);
anew[aarx+(aatx*desc->nb_rx)].y += phase.y * sqrt(1.0-desc->ricean_factor);
}
#ifdef DEBUG_CH
printf("(%d,%d,%d) %f->(%f,%f) (%f,%f) phase (%f,%f)\n",aarx,aatx,i,desc->amps[i],anew[aarx+(aatx*desc->nb_rx)].x,anew[aarx+(aatx*desc->nb_rx)].y,desc->aoa,desc->ricean_factor,phase.x,phase.y);
#endif
} //aatx
} //aarx
/*
// for debugging set a=anew;
for (aarx=0;aarxnb_rx;aarx++) {
for (aatx=0;aatxnb_tx;aatx++) {
desc->a[i][aarx+(aatx*desc->nb_rx)].x = anew[aarx+(aatx*desc->nb_rx)].x;
desc->a[i][aarx+(aatx*desc->nb_rx)].y = anew[aarx+(aatx*desc->nb_rx)].y;
printf("anew(%d,%d) = %f+1j*%f\n",aatx,aarx,anew[aarx+(aatx*desc->nb_rx)].x, anew[aarx+(aatx*desc->nb_rx)].y);
}
}
*/
//apply correlation matrix
//compute acorr = R_sqrt[i] * anew
alpha.x = 1.0;
alpha.y = 0.0;
beta.x = 0.0;
beta.y = 0.0;
cblas_zgemv(CblasRowMajor, CblasNoTrans, desc->nb_tx*desc->nb_rx, desc->nb_tx*desc->nb_rx,
(void*) &alpha, (void*) desc->R_sqrt[i/3], desc->nb_rx*desc->nb_tx,
(void*) anew, 1, (void*) &beta, (void*) acorr, 1);
/*
for (aarx=0;aarxnb_rx;aarx++) {
for (aatx=0;aatxnb_tx;aatx++) {
desc->a[i][aarx+(aatx*desc->nb_rx)].x = acorr[aarx+(aatx*desc->nb_rx)].x;
desc->a[i][aarx+(aatx*desc->nb_rx)].y = acorr[aarx+(aatx*desc->nb_rx)].y;
printf("tap %d, acorr1(%d,%d) = %f+1j*%f\n",i,aatx,aarx,acorr[aarx+(aatx*desc->nb_rx)].x, acorr[aarx+(aatx*desc->nb_rx)].y);
}
}
*/
if (desc->first_run==1){
cblas_zcopy(desc->nb_tx*desc->nb_rx, (void*) acorr, 1, (void*) desc->a[i], 1);
}
else {
// a = alpha*acorr+beta*a
// a = beta*a
// a = a+alpha*acorr
alpha.x = sqrt(1-desc->forgetting_factor);
alpha.y = 0;
beta.x = sqrt(desc->forgetting_factor);
beta.y = 0;
cblas_zscal(desc->nb_tx*desc->nb_rx, (void*) &beta, (void*) desc->a[i], 1);
cblas_zaxpy(desc->nb_tx*desc->nb_rx, (void*) &alpha, (void*) acorr, 1, (void*) desc->a[i], 1);
// desc->a[i][aarx+(aatx*desc->nb_rx)].x = (sqrt(desc->forgetting_factor)*desc->a[i][aarx+(aatx*desc->nb_rx)].x) + sqrt(1-desc->forgetting_factor)*anew.x;
// desc->a[i][aarx+(aatx*desc->nb_rx)].y = (sqrt(desc->forgetting_factor)*desc->a[i][aarx+(aatx*desc->nb_rx)].y) + sqrt(1-desc->forgetting_factor)*anew.y;
}
/*
for (aarx=0;aarxnb_rx;aarx++) {
for (aatx=0;aatxnb_tx;aatx++) {
//desc->a[i][aarx+(aatx*desc->nb_rx)].x = acorr[aarx+(aatx*desc->nb_rx)].x;
//desc->a[i][aarx+(aatx*desc->nb_rx)].y = acorr[aarx+(aatx*desc->nb_rx)].y;
printf("tap %d, a(%d,%d) = %f+1j*%f\n",i,aatx,aarx,desc->a[i][aarx+(aatx*desc->nb_rx)].x, desc->a[i][aarx+(aatx*desc->nb_rx)].y);
}
}
*/
} //nb_taps
stop_meas(&desc->random_channel);
//memset((void *)desc->ch[aarx+(aatx*desc->nb_rx)],0,(int)(desc->channel_length)*sizeof(struct complex));
if (abstraction_flag==0) {
start_meas(&desc->interp_time);
for (aarx=0; aarxnb_rx; aarx++) {
for (aatx=0; aatxnb_tx; aatx++) {
if (desc->channel_length == 1) {
desc->ch[aarx+(aatx*desc->nb_rx)][0].x = desc->a[0][aarx+(aatx*desc->nb_rx)].x;
desc->ch[aarx+(aatx*desc->nb_rx)][0].y = desc->a[0][aarx+(aatx*desc->nb_rx)].y;
} else {
for (k=0; k<(int)desc->channel_length; k++) {
desc->ch[aarx+(aatx*desc->nb_rx)][k].x = 0.0;
desc->ch[aarx+(aatx*desc->nb_rx)][k].y = 0.0;
for (l=0; lnb_taps; l++) {
if ((k - (desc->delays[l]*desc->sampling_rate) - NB_SAMPLES_CHANNEL_OFFSET) == 0)
s = 1.0;
else
s = sin(M_PI*(k - (desc->delays[l]*desc->sampling_rate) - NB_SAMPLES_CHANNEL_OFFSET))/
(M_PI*(k - (desc->delays[l]*desc->sampling_rate) - NB_SAMPLES_CHANNEL_OFFSET));
desc->ch[aarx+(aatx*desc->nb_rx)][k].x += s*desc->a[l][aarx+(aatx*desc->nb_rx)].x;
desc->ch[aarx+(aatx*desc->nb_rx)][k].y += s*desc->a[l][aarx+(aatx*desc->nb_rx)].y;
// printf("l %d : desc->ch.x %f\n",l,desc->a[l][aarx+(aatx*desc->nb_rx)].x);
} //nb_taps
#ifdef DEBUG_CH
k=0;
printf("(%d,%d,%d)->(%f,%f)\n",k,aarx,aatx,desc->ch[aarx+(aatx*desc->nb_rx)][k].x,desc->ch[aarx+(aatx*desc->nb_rx)][k].y);
#endif
}
} //channel_length
} //aatx
} //aarx
stop_meas(&desc->interp_time);
}
if (desc->first_run==1)
desc->first_run = 0;
return (0);
}
double N_RB2sampling_rate(uint16_t N_RB)
{
double sampling_rate;
switch (N_RB) {
case 6:
sampling_rate = 1.92;
break;
case 25:
sampling_rate = 7.68;
break;
case 50:
sampling_rate = 15.36;
break;
case 100:
sampling_rate = 30.72;
break;
default:
LOG_E(PHY,"Unknown N_PRB\n");
return(-1);
}
return(sampling_rate);
}
double N_RB2channel_bandwidth(uint16_t N_RB)
{
double channel_bandwidth;
switch (N_RB) {
case 6:
channel_bandwidth = 1.25;
break;
case 25:
channel_bandwidth = 5.00;
break;
case 50:
channel_bandwidth = 10.00;
break;
case 100:
channel_bandwidth = 20.00;
break;
default:
LOG_E(PHY,"Unknown N_PRB\n");
return(-1);
}
return(channel_bandwidth);
}
#ifdef RANDOM_CHANNEL_MAIN
#define sampling_rate 5.0
#define Td 2.0
main(int argc,char **argv) {
double amps[8] = {.8,.2,.1,.04,.02,.01,.005};
struct complex ch[(int)(1+2*sampling_rate*Td)],phase;
int i;
randominit();
phase.x = 1.0;
phase.y = 0;
random_channel(amps,Td, 8,sampling_rate,ch,(double)1.0,&phase);
/*
for (i=0;i<(11+2*sampling_rate*Td);i++){
printf("%f + sqrt(-1)*%f\n",ch[i].x,ch[i].y);
}
*/
}
#endif