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add channel sim

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This commit is contained in:
laurent
2019-06-12 16:45:52 +02:00
parent 71191fb9b7
commit a5b30c07bc
12 changed files with 550 additions and 113 deletions
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cmake_targets/CMakeLists.txt
+27 -2
View File
@@ -519,6 +519,9 @@ add_list1_option(NB_ANTENNAS_RX "2" "Number of antennas in reception" "1" "2" "4
add_list1_option(NB_ANTENNAS_TX "4" "Number of antennas in transmission" "1" "2" "4")
add_list2_option(RF_BOARD "EXMIMO" "RF head type" "None" "EXMIMO" "OAI_USRP" "OAI_BLADERF" "CPRIGW" "OAI_LMSSDR" "OAI_SIMU")
if (NOT ${RF_BOARD} STREQUAL "None")
add_definitions(-DMANAGED_RF=1)
endif()
add_list2_option(TRANSP_PRO "None" "Transport protocol type" "None" "ETHERNET")
@@ -627,8 +630,6 @@ set(HWLIB_TCP_BRIDGE_OAI_SOURCE
add_library(tcp_bridge_oai MODULE ${HWLIB_TCP_BRIDGE_OAI_SOURCE} )
set_target_properties(tcp_bridge_oai PROPERTIES COMPILE_FLAGS "-fvisibility=hidden")
add_library(rfsimulator MODULE ${OPENAIR_TARGETS}/ARCH/rfsimulator/simulator.c)
##########################################################
include_directories ("${OPENAIR_TARGETS}/ARCH/COMMON")
@@ -2010,6 +2011,11 @@ add_library(uescope MODULE ${XFORMS_SOURCE} ${XFORMS_SOURCE_SOFTMODEM} ${XFORMS_
target_link_libraries(enbscope ${XFORMS_LIBRARIES})
target_link_libraries(uescope ${XFORMS_LIBRARIES})
add_library(rfsimulator MODULE
${OPENAIR_TARGETS}/ARCH/rfsimulator/simulator.c
)
target_link_libraries(rfsimulator SIMU ${ATLAS_LIBRARIES})
set(CMAKE_MODULE_PATH "${OPENAIR_DIR}/cmake_targets/tools/MODULES" "${CMAKE_MODULE_PATH}")
#include T directory even if the T is off because T macros are in the code
@@ -2053,6 +2059,25 @@ add_definitions(-DASN1_MINIMUM_VERSION=924)
#################################
# add executables for operation
#################################
add_library(minimal_lib
${OPENAIR_DIR}/common/utils/backtrace.c
${OPENAIR_DIR}/common/utils/LOG/log.c
${OPENAIR_DIR}/common/config/config_userapi.c
${OPENAIR_DIR}/common/config/config_load_configmodule.c
${OPENAIR_DIR}/common/config/config_cmdline.c
${OPENAIR_DIR}/common/utils/minimal_stub.c
${T_SOURCE}
)
target_link_libraries(minimal_lib pthread dl ${T_LIB})
add_executable(replay_node
${OPENAIR_TARGETS}/ARCH/rfsimulator/stored_node.c
)
target_link_libraries (replay_node minimal_lib)
add_executable(measurement_display
${OPENAIR_DIR}/common/utils/threadPool/measurement_display.c)
target_link_libraries (measurement_display minimal_lib)
# lte-softmodem is both eNB and UE implementation
###################################################
common/config/config_userapi.c
+1 -1
View File
@@ -450,7 +450,7 @@ int config_setdefault_double(paramdef_t *cfgoptions, char *prefix) {
config_check_valptr(cfgoptions, (char **)&(cfgoptions->dblptr),sizeof(double));
if( ((cfgoptions->paramflags & PARAMFLAG_MANDATORY) == 0)) {
*(cfgoptions->u64ptr)=cfgoptions->defdblval;
*(cfgoptions->dblptr)=cfgoptions->defdblval;
status=1;
printf_params("[CONFIG] %s set to default value %lf\n",cfgoptions->optname , *(cfgoptions->dblptr));
}
common/utils/minimal_stub.c
+4
View File
@@ -0,0 +1,4 @@
int T_stdout;
void exit_function(const char *file, const char *function, const int line, const char *s) {
}
common/utils/simple_executable.h
+37
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@@ -0,0 +1,37 @@
#ifndef __SIMPLE_EXE_H__
#define __SIMPLE_EXE_H__
#ifndef __USE_GNU
#define __USE_GNU
#endif
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <stdio.h>
#include <pthread.h>
#include <sched.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <string.h>
#include <unistd.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <stdint.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <stdbool.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <common/utils/assertions.h>
#include <common/utils/LOG/log.h>
#include "common_lib.h"
#ifdef T
#undef T
#define T(...)
#endif
#endif
targets/ARCH/COMMON/common_lib.c
+14 -14
View File
@@ -42,35 +42,35 @@
int set_device(openair0_device *device) {
switch (device->type) {
case EXMIMO_DEV:
printf("[%s] has loaded EXPRESS MIMO device.\n",((device->host_type == RAU_HOST) ? "RAU": "RRU"));
LOG_I(HW,"[%s] has loaded EXPRESS MIMO device.\n",((device->host_type == RAU_HOST) ? "RAU": "RRU"));
break;
case USRP_B200_DEV:
printf("[%s] has loaded USRP B200 device.\n",((device->host_type == RAU_HOST) ? "RAU": "RRU"));
LOG_I(HW,"[%s] has loaded USRP B200 device.\n",((device->host_type == RAU_HOST) ? "RAU": "RRU"));
break;
case USRP_X300_DEV:
printf("[%s] has loaded USRP X300 device.\n",((device->host_type == RAU_HOST) ? "RAU": "RRU"));
LOG_I(HW,"[%s] has loaded USRP X300 device.\n",((device->host_type == RAU_HOST) ? "RAU": "RRU"));
break;
case BLADERF_DEV:
printf("[%s] has loaded BLADERF device.\n",((device->host_type == RAU_HOST) ? "RAU": "RRU"));
LOG_I(HW,"[%s] has loaded BLADERF device.\n",((device->host_type == RAU_HOST) ? "RAU": "RRU"));
break;
case LMSSDR_DEV:
printf("[%s] has loaded LMSSDR device.\n",((device->host_type == RAU_HOST) ? "RAU": "RRU"));
LOG_I(HW,"[%s] has loaded LMSSDR device.\n",((device->host_type == RAU_HOST) ? "RAU": "RRU"));
break;
case IRIS_DEV:
printf("[%s] has loaded Iris device.\n",((device->host_type == RAU_HOST) ? "RAU": "RRU"));
LOG_I(HW,"[%s] has loaded Iris device.\n",((device->host_type == RAU_HOST) ? "RAU": "RRU"));
break;
case NONE_DEV:
printf("[%s] has not loaded a HW device.\n",((device->host_type == RAU_HOST) ? "RAU": "RRU"));
LOG_I(HW,"[%s] has not loaded a HW device.\n",((device->host_type == RAU_HOST) ? "RAU": "RRU"));
break;
default:
printf("[%s] invalid HW device.\n",((device->host_type == RAU_HOST) ? "RAU": "RRU"));
LOG_E(HW,"[%s] invalid HW device.\n",((device->host_type == RAU_HOST) ? "RAU": "RRU"));
return -1;
}
@@ -80,17 +80,17 @@ int set_device(openair0_device *device) {
int set_transport(openair0_device *device) {
switch (device->transp_type) {
case ETHERNET_TP:
printf("[%s] has loaded ETHERNET trasport protocol.\n",((device->host_type == RAU_HOST) ? "RAU": "RRU"));
LOG_I(HW,"[%s] has loaded ETHERNET trasport protocol.\n",((device->host_type == RAU_HOST) ? "RAU": "RRU"));
return 0;
break;
case NONE_TP:
printf("[%s] has not loaded a transport protocol.\n",((device->host_type == RAU_HOST) ? "RAU": "RRU"));
LOG_I(HW,"[%s] has not loaded a transport protocol.\n",((device->host_type == RAU_HOST) ? "RAU": "RRU"));
return 0;
break;
default:
printf("[%s] invalid transport protocol.\n",((device->host_type == RAU_HOST) ? "RAU": "RRU"));
LOG_E(HW,"[%s] invalid transport protocol.\n",((device->host_type == RAU_HOST) ? "RAU": "RRU"));
return -1;
break;
}
@@ -119,7 +119,7 @@ int load_lib(openair0_device *device, openair0_config_t *openair0_cfg, eth_param
ret=load_module_shlib(libname,shlib_fdesc,1,NULL);
if (ret < 0) {
fprintf(stderr,"Library %s couldn't be loaded\n",libname);
LOG_E(HW,"Library %s couldn't be loaded\n",libname);
} else {
ret=((devfunc_t)shlib_fdesc[0].fptr)(device,openair0_cfg,cfg);
}
@@ -135,7 +135,7 @@ int openair0_device_load(openair0_device *device, openair0_config_t *openair0_cf
if ( rc >= 0) {
if ( set_device(device) < 0) {
fprintf(stderr, "%s %d:Unsupported radio head\n",__FILE__, __LINE__);
LOG_E(HW, "%s %d:Unsupported radio head\n",__FILE__, __LINE__);
return -1;
}
}
@@ -149,7 +149,7 @@ int openair0_transport_load(openair0_device *device, openair0_config_t *openair0
if ( rc >= 0) {
if ( set_transport(device) < 0) {
fprintf(stderr, "%s %d:Unsupported transport protocol\n",__FILE__, __LINE__);
LOG_E(HW, "%s %d:Unsupported transport protocol\n",__FILE__, __LINE__);
return -1;
}
}
targets/ARCH/COMMON/common_lib.h
+30 -4
View File
@@ -34,6 +34,7 @@
#define COMMON_LIB_H
#include <stdint.h>
#include <sys/types.h>
#include <openair1/PHY/TOOLS/tools_defs.h>
/* name of shared library implementing the radio front end */
#define OAI_RF_LIBNAME "oai_device"
@@ -83,9 +84,6 @@ typedef enum {
*/
/*!\brief RF device types
*/
#ifdef OCP_FRAMEWORK
#include <enums.h>
#else
typedef enum {
MIN_RF_DEV_TYPE = 0,
/*!\brief device is ExpressMIMO */
@@ -102,10 +100,13 @@ typedef enum {
IRIS_DEV,
/*!\brief device is NONE*/
NONE_DEV,
/*!\brief device is ADRV9371_ZC706 */
ADRV9371_ZC706_DEV,
/*!\brief device is UEDv2 */
UEDv2_DEV,
MAX_RF_DEV_TYPE
} dev_type_t;
#endif
/*!\brief transport protocol types
*/
@@ -384,6 +385,31 @@ struct openair0_device_t {
typedef int(*oai_device_initfunc_t)(openair0_device *device, openair0_config_t *openair0_cfg);
/* type of transport init function, implemented in shared lib */
typedef int(*oai_transport_initfunc_t)(openair0_device *device, openair0_config_t *openair0_cfg, eth_params_t *eth_params);
#define UE_MAGICDL_FDD 0xA5A5A5A5A5A5A5A5 // UE DL FDD record
#define UE_MAGICUL_FDD 0x5A5A5A5A5A5A5A5A // UE UL FDD record
#define UE_MAGICDL_TDD 0xA6A6A6A6A6A6A6A6 // UE DL TDD record
#define UE_MAGICUL_TDD 0x6A6A6A6A6A6A6A6A // UE UL TDD record
#define ENB_MAGICDL_FDD 0xB5B5B5B5B5B5B5B5 // eNB DL FDD record
#define ENB_MAGICUL_FDD 0x5B5B5B5B5B5B5B5B // eNB UL FDD record
#define ENB_MAGICDL_TDD 0xB6B6B6B6B6B6B6B6 // eNB DL TDD record
#define ENB_MAGICUL_TDD 0x6B6B6B6B6B6B6B6B // eNB UL TDD record
#define OPTION_LZ4 0x00000001 // LZ4 compression (option_value is set to compressed size)
#define sample_t struct complex16 // 2*16 bits complex number
typedef struct {
uint64_t magic; // Magic value (see defines above)
uint32_t size; // Number of samples per antenna to follow this header
uint32_t nbAnt; // Total number of antennas following this header
// Samples per antenna follow this header,
// i.e. nbAnt = 2 => this header+samples_antenna_0+samples_antenna_1
// data following this header in bytes is nbAnt*size*sizeof(sample_t)
uint64_t timestamp; // Timestamp value of first sample
uint32_t option_value; // Option value
uint32_t option_flag; // Option flag
} samplesBlockHeader_t;
#ifdef __cplusplus
extern "C"
targets/ARCH/rfsimulator/README.md
+53 -23
View File
@@ -1,14 +1,26 @@
## General
#General
This is a RF simulator that allows to test OAI without a RF board.
It replaces a actual RF board driver.
As much as possible, it works like a RF board, but not in realtime: it can run faster than realtime if there is enough CPU or slower (it is CPU bound instead of real time RF sampling bound)
## build
#build
No specific build is required, use the [oai softmodem build procedure](../../../doc/BUILD.md)
## From build_oai
You can build it the same way, and together with actual RF driver
Example:
```bash
./build_oai --ue-nas-use-tun --UE --eNB -w SIMU
```
It is also possible to build actual RF and use choose on each run:
```bash
./build_oai --ue-nas-use-tun --UE --eNB -w USRP --rfsimulator
```
Will build both the eNB (lte-softmodem) and the UE (lte-uesoftmodem)
We recommend to use the option --ue-nas-use-tun that is much simpler to use than the OAI kernel driver.
## Add the rfsimulator after initial build
After any regular build, you can compile the driver
```bash
cd <the_compilation_dir_from_bouild_oai_script>/build
@@ -18,35 +30,21 @@ Then, you can use it freely
# Usage
Setting the env variable RFSIMULATOR enables the RF board simulator
It should the set to "enb" in the eNB
It should the set to "server" in the eNB or gNB
## 4G case
For the UE, it should be set to the IP address of the eNB
example:
```bash
sudo RFSIMULATOR=192.168.2.200 ./lte-uesoftmodem -C 2685000000 -r 50 --rfsim
sudo RFSIMULATOR=192.168.2.200 ./lte-uesoftmodem -C 2685000000 -r 50
```
For the eNodeB, use a valid configuration file setup for USRP board tests and start the softmodem as usual, but adding the `--rfsim` option.
```bash
sudo RFSIMULATOR=enb ./lte-softmodem -O <config file> --rfsim
```
Except this, the UE and the eNB can be used as it the RF is real
If you reach 'RA not active' on UE, be careful to generate a valid SIM
```bash
$OPENAIR_DIR/targets/bin/conf2uedata -c $OPENAIR_DIR/openair3/NAS/TOOLS/ue_eurecom_test_sfr.conf -o .
```
This simulator can also be used with the `--noS1` option, in this case you must run the eNodeB and the UE on different PCs.
## 5G case
After regular build, add the simulation driver
(don't use ./build_oai -w SIMU until we merge 4G and 5G branches)
```bash
@@ -55,7 +53,7 @@ make rfsimulator
```
### Launch gNB in one window
```bash
sudo RFSIMULATOR=enb ./nr-softmodem -O ../../../targets/PROJECTS/GENERIC-LTE-EPC/CONF/gnb.band78.tm1.106PRB.usrpn300.conf --parallel-config PARALLEL_SINGLE_THREAD
sudo RFSIMULATOR=server ./nr-softmodem -O ../../../targets/PROJECTS/GENERIC-LTE-EPC/CONF/gnb.band78.tm1.106PRB.usrpn300.conf --parallel-config PARALLEL_SINGLE_THREAD
```
### Launch UE in another window
```bash
@@ -64,8 +62,40 @@ sudo RFSIMULATOR=127.0.0.1 ./nr-uesoftmodem --numerology 1 -r 106 -C 3510000000
Of course, set the gNB machine IP address if the UE and the gNB are not on the same machine
In UE, you can add "-d" to get the softscope
## Caveacts
### store and replay
Still issues in power control: txgain, rxgain are not used
You can store emitted I/Q samples:
If you set the environment variable: saveIQfile to a file name
The simulator will write all IQ samples into this file
Then, you can replay with the executable "replay_node"
First compile it, as the other binaries
```
make replay_node
```
You can use this binary as I/Q data source to feed whatever UE or NB with recorded I/Q samples.
The file format is successive blocks of a header followed by the I/Q array.
If you have existing stored I/Q, you can adpat the tool "replay_node" to convert your format to the rfsimulator format.
The format intend to be compatible with the OAI store/replay feature on USRP
### Channel simulation
The RF channel simulator is called.
In current version all channel paramters are hard coded in the call to:
```
new_channel_desc_scm(bridge->tx_num_channels,bridge->rx_num_channels,
AWGN,
bridge->sample_rate,
bridge->tx_bw,
0.0, // forgetting_factor
0, // maybe used for TA
0); // path_loss in dB
```
Only the input noise can be changed on command line with -s parameter.
With path loss = 0 set "-s 5" to see a little noise
#Caveacts
Still issues in power control: txgain, rxgain are not used
targets/ARCH/rfsimulator/simulator.c
+238 -66
View File
@@ -3,6 +3,12 @@
copyleft: OpenAirInterface Software Alliance and it's licence
*/
/*
* Open issues and limitations
* The read and write should be called in the same thread, that is not new USRP UHD design
* When the opposite side switch from passive reading to active R+Write, the synchro is not fully deterministic
*/
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
@@ -21,63 +27,175 @@
#include "common_lib.h"
#include <openair1/PHY/defs_eNB.h>
#include "openair1/PHY/defs_UE.h"
#include <openair1/SIMULATION/TOOLS/sim.h>
#define PORT 4043 //TCP port for this simulator
#define CirSize 3072000 // 100ms is enough
#define sample_t uint32_t // 2*16 bits complex number
#define sampleToByte(a,b) ((a)*(b)*sizeof(sample_t))
#define byteToSample(a,b) ((a)/(sizeof(sample_t)*(b)))
#define MAGICeNB 0xA5A5A5A5A5A5A5A5
#define MAGICUE 0x5A5A5A5A5A5A5A5A
typedef struct {
uint64_t magic;
uint32_t size;
uint32_t nbAnt;
uint64_t timestamp;
} transferHeader;
#define MAX_SIMULATION_CONNECTED_NODES 5
#define GENERATE_CHANNEL 10 //each frame in DL
// Fixme: datamodel, external variables in .h files, ...
#include <common/ran_context.h>
extern double snr_dB;
extern RAN_CONTEXT_t RC;
//
pthread_mutex_t Sockmutex;
typedef struct buffer_s {
int conn_sock;
bool alreadyRead;
uint64_t lastReceivedTS;
bool headerMode;
transferHeader th;
samplesBlockHeader_t th;
char *transferPtr;
uint64_t remainToTransfer;
char *circularBufEnd;
sample_t *circularBuf;
channel_desc_t *channel_model;
} buffer_t;
typedef struct {
int listen_sock, epollfd;
uint64_t nextTimestamp;
uint64_t typeStamp;
uint64_t initialAhead;
char *ip;
int saveIQfile;
buffer_t buf[FD_SETSIZE];
int rx_num_channels;
int tx_num_channels;
double sample_rate;
double tx_bw;
} rfsimulator_state_t;
/*
Legacy study:
The parameters are:
gain&loss (decay, signal power, ...)
either a fixed gain in dB, a target power in dBm or ACG (automatic control gain) to a target average
=> don't redo the AGC, as it was used in UE case, that must have a AGC inside the UE
will be better to handle the "set_gain()" called by UE to apply it's gain (enable test of UE power loop)
lin_amp = pow(10.0,.05*txpwr_dBm)/sqrt(nb_tx_antennas);
a lot of operations in legacy, grouped in one simulation signal decay: txgain*decay*rxgain
multi_path (auto convolution, ISI, ...)
either we regenerate the channel (call again random_channel(desc,0)), or we keep it over subframes
legacy: we regenerate each sub frame in UL, and each frame only in DL
*/
void rxAddInput( struct complex16 *input_sig, struct complex16 *after_channel_sig,
int rxAnt,
channel_desc_t *channelDesc,
int nbSamples,
uint64_t TS
) {
// channelDesc->path_loss_dB should contain the total path gain
// so, in actual RF: tx gain + path loss + rx gain (+antenna gain, ...)
// UE and NB gain control to be added
// Fixme: not sure when it is "volts" so dB is 20*log10(...) or "power", so dB is 10*log10(...)
const double pathLossLinear = pow(10,channelDesc->path_loss_dB/20.0);
// Energy in one sample to calibrate input noise
//Fixme: modified the N0W computation, not understand the origin value
const double KT=1.38e-23*290; //Boltzman*temperature
// sampling rate is linked to acquisition band (the input pass band filter)
const double noise_figure_watt = KT*channelDesc->sampling_rate;
// Fixme: how to convert a noise in Watt into a 12 bits value out of the RF ADC ?
// the parameter "-s" is declared as SNR, but the input power is not well defined
// −132.24 dBm is a LTE subcarrier noise, that was used in origin code (15KHz BW thermal noise)
const double rxGain= 132.24 - snr_dB;
// sqrt(4*noise_figure_watt) is the thermal noise factor (volts)
// fixme: the last constant is pure trial results to make decent noise
const double noise_per_sample = sqrt(4*noise_figure_watt) * pow(10,rxGain/20) *10;
// Fixme: we don't fill the offset length samples at begining ?
// anyway, in today code, channel_offset=0
const int dd = abs(channelDesc->channel_offset);
const int nbTx=channelDesc->nb_tx;
for (int i=0; i<((int)nbSamples-dd); i++) {
struct complex16 *out_ptr=after_channel_sig+dd+i;
struct complex rx_tmp= {0};
for (int txAnt=0; txAnt < nbTx; txAnt++) {
const struct complex *channelModel= channelDesc->ch[rxAnt+(txAnt*channelDesc->nb_rx)];
//const struct complex *channelModelEnd=channelModel+channelDesc->channel_length;
for (int l = 0; l<(int)channelDesc->channel_length; l++) {
// let's assume TS+i >= l
// fixme: the rfsimulator current structure is interleaved antennas
// this has been designed to not have to wait a full block transmission
// but it is not very usefull
// it would be better to split out each antenna in a separate flow
// that will allow to mix ru antennas freely
struct complex16 tx16=input_sig[((TS+i-l)*nbTx+txAnt)%CirSize];
rx_tmp.x += tx16.r * channelModel[l].x - tx16.i * channelModel[l].y;
rx_tmp.y += tx16.i * channelModel[l].x + tx16.r * channelModel[l].y;
} //l
}
out_ptr->r += round(rx_tmp.x*pathLossLinear + noise_per_sample*gaussdouble(0.0,1.0));
printf("in: %d, out %d= %f*%f + %f*%f\n",
input_sig[((TS+i)*nbTx)%CirSize].r, out_ptr->r , rx_tmp.x,
pathLossLinear, noise_per_sample,gaussdouble(0.0,1.0));
out_ptr->i += round(rx_tmp.y*pathLossLinear + noise_per_sample*gaussdouble(0.0,1.0));
out_ptr++;
}
if ( (TS*nbTx)%CirSize+nbSamples <= CirSize )
// Cast to a wrong type for compatibility !
LOG_D(HW,"Input power %f, output power: %f, channel path loss %f, noise coeff: %f \n",
10*log10((double)signal_energy((int32_t *)&input_sig[(TS*nbTx)%CirSize], nbSamples)),
10*log10((double)signal_energy((int32_t *)after_channel_sig, nbSamples)),
channelDesc->path_loss_dB,
10*log10(noise_per_sample));
}
void allocCirBuf(rfsimulator_state_t *bridge, int sock) {
buffer_t *ptr=&bridge->buf[sock];
AssertFatal ( (ptr->circularBuf=(sample_t *) malloc(sampleToByte(CirSize,1))) != NULL, "");
ptr->circularBufEnd=((char *)ptr->circularBuf)+sampleToByte(CirSize,1);
ptr->conn_sock=sock;
ptr->alreadyRead=false;
ptr->lastReceivedTS=0;
ptr->headerMode=true;
ptr->transferPtr=(char *)&ptr->th;
ptr->remainToTransfer=sizeof(transferHeader);
ptr->remainToTransfer=sizeof(samplesBlockHeader_t);
int sendbuff=1000*1000*10;
AssertFatal ( setsockopt(sock, SOL_SOCKET, SO_SNDBUF, &sendbuff, sizeof(sendbuff)) == 0, "");
struct epoll_event ev= {0};
ev.events = EPOLLIN | EPOLLRDHUP;
ev.data.fd = sock;
AssertFatal(epoll_ctl(bridge->epollfd, EPOLL_CTL_ADD, sock, &ev) != -1, "");
// create channel simulation model for this mode reception
// snr_dB is pure global, coming from configuration paramter "-s"
// Fixme: referenceSignalPower should come from the right place
// but the datamodel is inconsistant
// legacy: RC.ru[ru_id]->frame_parms.pdsch_config_common.referenceSignalPower
// (must not come from ru[]->frame_parms as it doesn't belong to ru !!!)
// Legacy sets it as:
// ptr->channel_model->path_loss_dB = -132.24 + snr_dB - RC.ru[0]->frame_parms->pdsch_config_common.referenceSignalPower;
// we use directly the paramter passed on the command line ("-s")
// the value channel_model->path_loss_dB seems only a storage place (new_channel_desc_scm() only copy the passed value)
// Legacy changes directlty the variable channel_model->path_loss_dB place to place
// while calling new_channel_desc_scm() with path losses = 0
ptr->channel_model=new_channel_desc_scm(bridge->tx_num_channels,bridge->rx_num_channels,
AWGN,
bridge->sample_rate,
bridge->tx_bw,
0.0, // forgetting_factor
0, // maybe used for TA
0); // path_loss in dB
random_channel(ptr->channel_model,false);
}
void removeCirBuf(rfsimulator_state_t *bridge, int sock) {
AssertFatal( epoll_ctl(bridge->epollfd, EPOLL_CTL_DEL, sock, NULL) != -1, "");
close(sock);
free(bridge->buf[sock].circularBuf);
// Fixme: no free_channel_desc_scm(bridge->buf[sock].channel_model) implemented
// a lot of mem leaks
free(bridge->buf[sock].channel_model);
memset(&bridge->buf[sock], 0, sizeof(buffer_t));
bridge->buf[sock].conn_sock=-1;
}
@@ -87,12 +205,11 @@ void socketError(rfsimulator_state_t *bridge, int sock) {
LOG_W(HW,"Lost socket \n");
removeCirBuf(bridge, sock);
if (bridge->typeStamp==MAGICUE)
if (bridge->typeStamp==UE_MAGICDL_FDD)
exit(1);
}
}
#define helpTxt "\
\x1b[31m\
rfsimulator: error: you have to run one UE and one eNB\n\
@@ -117,11 +234,18 @@ void setblocking(int sock, enum blocking_t active) {
AssertFatal(fcntl(sock, F_SETFL, opts) >= 0, "");
}
static bool flushInput(rfsimulator_state_t *t);
static bool flushInput(rfsimulator_state_t *t, int timeout);
void fullwrite(int fd, void *_buf, int count, rfsimulator_state_t *t) {
void fullwrite(int fd, void *_buf, ssize_t count, rfsimulator_state_t *t) {
if (t->saveIQfile != -1) {
if (write(t->saveIQfile, _buf, count) != count )
LOG_E(HW,"write in save iq file failed (%s)\n",strerror(errno));
}
AssertFatal(fd>=0 && _buf && count >0 && t,
"Bug: %d/%p/%zd/%p", fd, _buf, count, t);
char *buf = _buf;
int l;
ssize_t l;
setblocking(fd, notBlocking);
while (count) {
@@ -132,7 +256,9 @@ void fullwrite(int fd, void *_buf, int count, rfsimulator_state_t *t) {
continue;
if(errno==EAGAIN) {
flushInput(t);
// The opposite side is saturated
// we read incoming sockets meawhile waiting
flushInput(t, 5);
continue;
} else
return;
@@ -145,7 +271,7 @@ void fullwrite(int fd, void *_buf, int count, rfsimulator_state_t *t) {
int server_start(openair0_device *device) {
rfsimulator_state_t *t = (rfsimulator_state_t *) device->priv;
t->typeStamp=MAGICeNB;
t->typeStamp=ENB_MAGICDL_FDD;
AssertFatal((t->listen_sock = socket(AF_INET, SOCK_STREAM, 0)) >= 0, "");
int enable = 1;
AssertFatal(setsockopt(t->listen_sock, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(int)) == 0, "");
@@ -168,7 +294,7 @@ sin_addr:
int start_ue(openair0_device *device) {
rfsimulator_state_t *t = device->priv;
t->typeStamp=MAGICUE;
t->typeStamp=UE_MAGICDL_FDD;
int sock;
AssertFatal((sock = socket(AF_INET, SOCK_STREAM, 0)) >= 0, "");
struct sockaddr_in addr = {
@@ -200,14 +326,16 @@ sin_addr:
return 0;
}
uint64_t lastW=-1;
int rfsimulator_write(openair0_device *device, openair0_timestamp timestamp, void **samplesVoid, int nsamps, int nbAnt, int flags) {
rfsimulator_state_t *t = device->priv;
LOG_D(HW,"sending %d samples at time: %ld\n", nsamps, timestamp);
for (int i=0; i<FD_SETSIZE; i++) {
buffer_t *ptr=&t->buf[i];
if (ptr->conn_sock >= 0 ) {
transferHeader header= {t->typeStamp, nsamps, nbAnt, timestamp};
samplesBlockHeader_t header= {t->typeStamp, nsamps, nbAnt, timestamp};
fullwrite(ptr->conn_sock,&header, sizeof(header), t);
sample_t tmpSamples[nsamps][nbAnt];
@@ -223,21 +351,27 @@ int rfsimulator_write(openair0_device *device, openair0_timestamp timestamp, voi
}
}
lastW=timestamp;
LOG_D(HW,"sent %d samples at time: %ld->%ld, energy in first antenna: %d\n",
nsamps, timestamp, timestamp+nsamps, signal_energy(samplesVoid[0], nsamps) );
// Let's verify we don't have incoming data
// This is mandatory when the opposite side don't transmit
// This is mandatory when the opposite side don't transmit
flushInput(t, 0);
pthread_mutex_unlock(&Sockmutex);
return nsamps;
}
static bool flushInput(rfsimulator_state_t *t) {
static bool flushInput(rfsimulator_state_t *t, int timeout) {
// Process all incoming events on sockets
// store the data in lists
struct epoll_event events[FD_SETSIZE]= {0};
int nfds = epoll_wait(t->epollfd, events, FD_SETSIZE, 200);
int nfds = epoll_wait(t->epollfd, events, FD_SETSIZE, timeout);
if ( nfds==-1 ) {
if ( errno==EINTR || errno==EAGAIN )
if ( errno==EINTR || errno==EAGAIN ) {
return false;
else
} else
AssertFatal(false,"error in epoll_wait\n");
}
@@ -263,7 +397,7 @@ static bool flushInput(rfsimulator_state_t *t) {
continue;
}
int blockSz;
ssize_t blockSz;
if ( b->headerMode)
blockSz=b->remainToTransfer;
@@ -272,7 +406,7 @@ static bool flushInput(rfsimulator_state_t *t) {
b->remainToTransfer :
b->circularBufEnd - 1 - b->transferPtr ;
int sz=recv(fd, b->transferPtr, blockSz, MSG_DONTWAIT);
ssize_t sz=recv(fd, b->transferPtr, blockSz, MSG_DONTWAIT);
if ( sz < 0 ) {
if ( errno != EAGAIN ) {
@@ -282,6 +416,7 @@ static bool flushInput(rfsimulator_state_t *t) {
} else if ( sz == 0 )
continue;
LOG_D(HW, "Socket rcv %zd bytes\n", sz);
AssertFatal((b->remainToTransfer-=sz) >= 0, "");
b->transferPtr+=sz;
@@ -290,39 +425,44 @@ static bool flushInput(rfsimulator_state_t *t) {
// check the header and start block transfer
if ( b->headerMode==true && b->remainToTransfer==0) {
AssertFatal( (t->typeStamp == MAGICUE && b->th.magic==MAGICeNB) ||
(t->typeStamp == MAGICeNB && b->th.magic==MAGICUE), "Socket Error in protocol");
AssertFatal( (t->typeStamp == UE_MAGICDL_FDD && b->th.magic==ENB_MAGICDL_FDD) ||
(t->typeStamp == ENB_MAGICDL_FDD && b->th.magic==UE_MAGICDL_FDD), "Socket Error in protocol");
b->headerMode=false;
b->alreadyRead=true;
if ( b->lastReceivedTS != b->th.timestamp) {
int nbAnt= b->th.nbAnt;
for (uint64_t index=b->lastReceivedTS; index < b->th.timestamp; index++ )
for (int a=0; a < nbAnt; a++)
b->circularBuf[(index*nbAnt+a)%CirSize]=0;
for (uint64_t index=b->lastReceivedTS; index < b->th.timestamp; index++ ) {
for (int a=0; a < nbAnt; a++) {
b->circularBuf[(index*nbAnt+a)%CirSize].r=0;
b->circularBuf[(index*nbAnt+a)%CirSize].i=0;
}
}
LOG_W(HW,"gap of: %ld in reception\n", b->th.timestamp-b->lastReceivedTS );
}
b->lastReceivedTS=b->th.timestamp;
AssertFatal(lastW == -1 || ( abs((double)lastW-b->lastReceivedTS) < (double)CirSize),
"Tx/Rx shift too large Tx:%lu, Rx:%lu\n", lastW, b->lastReceivedTS);
b->transferPtr=(char *)&b->circularBuf[b->lastReceivedTS%CirSize];
b->remainToTransfer=sampleToByte(b->th.size, b->th.nbAnt);
}
if ( b->headerMode==false ) {
LOG_D(HW,"Set b->lastReceivedTS %ld\n", b->lastReceivedTS);
b->lastReceivedTS=b->th.timestamp+b->th.size-byteToSample(b->remainToTransfer,b->th.nbAnt);
// First block in UE, resync with the eNB current TS
if ( t->nextTimestamp == 0 )
t->nextTimestamp=b->lastReceivedTS-b->th.size;
if ( b->remainToTransfer==0) {
LOG_D(HW,"Completed block reception: %ld\n", b->lastReceivedTS);
// First block in UE, resync with the eNB current TS
if ( t->nextTimestamp == 0 )
t->nextTimestamp=b->lastReceivedTS-b->th.size;
b->headerMode=true;
b->transferPtr=(char *)&b->th;
b->remainToTransfer=sizeof(transferHeader);
b->remainToTransfer=sizeof(samplesBlockHeader_t);
b->th.magic=-1;
}
}
@@ -334,10 +474,10 @@ static bool flushInput(rfsimulator_state_t *t) {
int rfsimulator_read(openair0_device *device, openair0_timestamp *ptimestamp, void **samplesVoid, int nsamps, int nbAnt) {
if (nbAnt != 1) {
LOG_E(HW, "rfsimulator: only 1 antenna tested\n");
exit(1);
LOG_W(HW, "rfsimulator: only 1 antenna tested\n");
}
pthread_mutex_lock(&Sockmutex);
rfsimulator_state_t *t = device->priv;
LOG_D(HW, "Enter rfsimulator_read, expect %d samples, will release at TS: %ld\n", nsamps, t->nextTimestamp+nsamps);
// deliver data from received data
@@ -350,13 +490,14 @@ int rfsimulator_read(openair0_device *device, openair0_timestamp *ptimestamp, vo
if ( first_sock == FD_SETSIZE ) {
// no connected device (we are eNB, no UE is connected)
if (!flushInput(t)) {
if (!flushInput(t, 10)) {
for (int x=0; x < nbAnt; x++)
memset(samplesVoid[x],0,sampleToByte(nsamps,1));
t->nextTimestamp+=nsamps;
LOG_W(HW,"Generated void samples for Rx: %ld\n", t->nextTimestamp);
*ptimestamp = t->nextTimestamp-nsamps;
pthread_mutex_unlock(&Sockmutex);
return nsamps;
}
} else {
@@ -365,20 +506,21 @@ int rfsimulator_read(openair0_device *device, openair0_timestamp *ptimestamp, vo
do {
have_to_wait=false;
for ( int sock=0; sock<FD_SETSIZE; sock++)
if ( t->buf[sock].circularBuf &&
t->buf[sock].alreadyRead && //>= t->initialAhead &&
(t->nextTimestamp+nsamps) > t->buf[sock].lastReceivedTS ) {
have_to_wait=true;
break;
}
for ( int sock=0; sock<FD_SETSIZE; sock++) {
if ( t->buf[sock].circularBuf && t->buf[sock].alreadyRead )
if ( t->buf[sock].lastReceivedTS == 0 ||
(t->nextTimestamp+nsamps) > t->buf[sock].lastReceivedTS ) {
have_to_wait=true;
break;
}
}
if (have_to_wait)
/*printf("Waiting on socket, current last ts: %ld, expected at least : %ld\n",
ptr->lastReceivedTS,
t->nextTimestamp+nsamps);
*/
flushInput(t);
flushInput(t, 3);
} while (have_to_wait);
}
@@ -386,17 +528,25 @@ int rfsimulator_read(openair0_device *device, openair0_timestamp *ptimestamp, vo
for (int a=0; a<nbAnt; a++)
memset(samplesVoid[a],0,sampleToByte(nsamps,1));
// Add all input signal in the output buffer
// Add all input nodes signal in the output buffer
for (int sock=0; sock<FD_SETSIZE; sock++) {
buffer_t *ptr=&t->buf[sock];
if ( ptr->circularBuf && ptr->alreadyRead ) {
for (int a=0; a<nbAnt; a++) {
sample_t *out=(sample_t *)samplesVoid[a];
bool reGenerateChannel=false;
for ( int i=0; i < nsamps; i++ )
out[i]+=ptr->circularBuf[((t->nextTimestamp+i)*nbAnt+a)%CirSize]<<1;
}
//fixme: when do we regenerate
// it seems legacy behavior is: never in UL, each frame in DL
if (reGenerateChannel)
random_channel(ptr->channel_model,0);
for (int a=0; a<nbAnt; a++)
rxAddInput( ptr->circularBuf, (struct complex16 *) samplesVoid[a],
a,
ptr->channel_model,
nsamps,
t->nextTimestamp
);
}
}
@@ -406,10 +556,9 @@ int rfsimulator_read(openair0_device *device, openair0_timestamp *ptimestamp, vo
nsamps,
*ptimestamp, t->nextTimestamp,
signal_energy(samplesVoid[0], nsamps));
pthread_mutex_unlock(&Sockmutex);
return nsamps;
}
int rfsimulator_request(openair0_device *device, void *msg, ssize_t msg_len) {
abort();
return 0;
@@ -434,11 +583,11 @@ int rfsimulator_set_freq(openair0_device *device, openair0_config_t *openair0_cf
int rfsimulator_set_gains(openair0_device *device, openair0_config_t *openair0_cfg) {
return 0;
}
__attribute__((__visibility__("default")))
int device_init(openair0_device *device, openair0_config_t *openair0_cfg) {
//set_log(HW,OAILOG_DEBUG);
// to change the log level, use this on command line
// --log_config.hw_log_level debug
// (for phy layer, replace "hw" by "phy"
rfsimulator_state_t *rfsimulator = (rfsimulator_state_t *)calloc(sizeof(rfsimulator_state_t),1);
if ((rfsimulator->ip=getenv("RFSIMULATOR")) == NULL ) {
@@ -446,11 +595,28 @@ int device_init(openair0_device *device, openair0_config_t *openair0_cfg) {
exit(1);
}
rfsimulator->typeStamp = strncasecmp(rfsimulator->ip,"enb",3) == 0 ?
MAGICeNB:
MAGICUE;
LOG_I(HW,"rfsimulator: running as %s\n", rfsimulator-> typeStamp == MAGICeNB ? "eNB" : "UE");
device->trx_start_func = rfsimulator->typeStamp == MAGICeNB ?
pthread_mutex_init(&Sockmutex, NULL);
if ( strncasecmp(rfsimulator->ip,"enb",3) == 0 ||
strncasecmp(rfsimulator->ip,"server",3) == 0 )
rfsimulator->typeStamp = ENB_MAGICDL_FDD;
else
rfsimulator->typeStamp = UE_MAGICDL_FDD;
LOG_I(HW,"rfsimulator: running as %s\n", rfsimulator-> typeStamp == ENB_MAGICDL_FDD ? "(eg)NB" : "UE");
char *saveF;
if ((saveF=getenv("saveIQfile")) != NULL) {
rfsimulator->saveIQfile=open(saveF,O_APPEND| O_CREAT|O_TRUNC | O_WRONLY, 0666);
if ( rfsimulator->saveIQfile != -1 )
LOG_I(HW,"rfsimulator: will save written IQ samples in %s\n", saveF);
else
LOG_E(HW, "can't open %s for IQ saving (%s)\n", saveF, strerror(errno));
} else
rfsimulator->saveIQfile = -1;
device->trx_start_func = rfsimulator->typeStamp == ENB_MAGICDL_FDD ?
server_start :
start_ue;
device->trx_get_stats_func = rfsimulator_get_stats;
@@ -470,6 +636,12 @@ int device_init(openair0_device *device, openair0_config_t *openair0_cfg) {
rfsimulator->buf[i].conn_sock=-1;
AssertFatal((rfsimulator->epollfd = epoll_create1(0)) != -1,"");
rfsimulator->initialAhead=openair0_cfg[0].sample_rate/1000; // One sub frame
// initialize channel simulation
rfsimulator->tx_num_channels=openair0_cfg->tx_num_channels;
rfsimulator->rx_num_channels=openair0_cfg->rx_num_channels;
rfsimulator->sample_rate=openair0_cfg->sample_rate;
rfsimulator->tx_bw=openair0_cfg->tx_bw;
randominit(0);
set_taus_seed(0);
return 0;
}
targets/ARCH/rfsimulator/stored_node.c
+142
View File
@@ -0,0 +1,142 @@
/*
Author: Laurent THOMAS, Open Cells
copyleft: OpenAirInterface Software Alliance and it's licence
*/
#include <common/utils/simple_executable.h>
void fullwrite(int fd, void *_buf, int count) {
char *buf = _buf;
int l;
while (count) {
l = write(fd, buf, count);
if (l <= 0) {
if (errno==EINTR)
continue;
if(errno==EAGAIN) {
continue;
} else {
AssertFatal(false,"Lost socket\n");
}
} else {
count -= l;
buf += l;
}
}
}
int server_start(short port) {
int listen_sock;
AssertFatal((listen_sock = socket(AF_INET, SOCK_STREAM, 0)) >= 0, "");
int enable = 1;
AssertFatal(setsockopt(listen_sock, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(int)) == 0, "");
struct sockaddr_in addr = {
sin_family:
AF_INET,
sin_port:
htons(port),
sin_addr:
{ s_addr: INADDR_ANY }
};
bind(listen_sock, (struct sockaddr *)&addr, sizeof(addr));
AssertFatal(listen(listen_sock, 5) == 0, "");
return accept(listen_sock,NULL,NULL);
}
int client_start(char *IP, short port) {
int sock;
AssertFatal((sock = socket(AF_INET, SOCK_STREAM, 0)) >= 0, "");
struct sockaddr_in addr = {
sin_family:
AF_INET,
sin_port:
htons(port),
sin_addr:
{ s_addr: INADDR_ANY }
};
addr.sin_addr.s_addr = inet_addr(IP);
bool connected=false;
while(!connected) {
LOG_I(HW,"rfsimulator: trying to connect to %s:%d\n", IP, port);
if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == 0) {
LOG_I(HW,"rfsimulator: connection established\n");
connected=true;
}
perror("simulated node");
sleep(1);
}
return sock;
}
enum blocking_t {
notBlocking,
blocking
};
void setblocking(int sock, enum blocking_t active) {
int opts;
AssertFatal( (opts = fcntl(sock, F_GETFL)) >= 0,"");
if (active==blocking)
opts = opts & ~O_NONBLOCK;
else
opts = opts | O_NONBLOCK;
AssertFatal(fcntl(sock, F_SETFL, opts) >= 0, "");
}
int main(int argc, char *argv[]) {
if(argc != 4) {
printf("Need parameters: source file, server or destination IP, TCP port\n");
exit(1);
}
int fd;
AssertFatal((fd=open(argv[1],O_RDONLY)) != -1, "file: %s", argv[1]);
off_t fileSize=lseek(fd, 0, SEEK_END);
int serviceSock;
if (strcmp(argv[2],"server")==0) {
serviceSock=server_start(atoi(argv[3]));
} else {
client_start(argv[2],atoi(argv[3]));
}
samplesBlockHeader_t header;
int bufSize=100000;
void *buff=malloc(bufSize);
while (1) {
//Rewind the file to loop on the samples
if ( lseek(fd, 0, SEEK_CUR) >= fileSize )
lseek(fd, 0, SEEK_SET);
// Read one block and send it
setblocking(serviceSock, blocking);
AssertFatal(read(fd,&header,sizeof(header)), "");
fullwrite(serviceSock, &header, sizeof(header));
int dataSize=sizeof(sample_t)*header.size*header.nbAnt;
if (dataSize>bufSize)
buff=realloc(buff,dataSize);
AssertFatal(read(fd,buff,dataSize) == dataSize, "");
fullwrite(serviceSock, buff, dataSize);
// Purge incoming samples
setblocking(serviceSock, notBlocking);
while(recv(serviceSock,buff, bufSize, MSG_DONTWAIT) > 0) {
}
}
return 0;
}
targets/RT/USER/lte-softmodem-common.c
+1
View File
@@ -37,6 +37,7 @@
static softmodem_params_t softmodem_params;
char *parallel_config=NULL;
char *worker_config=NULL;
double snr_dB=25;
uint64_t get_softmodem_optmask(void) {
return softmodem_params.optmask;
targets/RT/USER/lte-softmodem.h
+2 -1
View File
@@ -150,7 +150,6 @@
{"usrp-clksrc", CONFIG_HLP_USRP_CLK_SRC,0, strptr:(char **)&usrp_clksrc, defstrval:"internal", TYPE_STRING, 0}, \
{"mmapped-dma", CONFIG_HLP_DMAMAP, PARAMFLAG_BOOL, uptr:&mmapped_dma, defintval:0, TYPE_INT, 0}, \
{"clock", CONFIG_HLP_CLK, 0, uptr:&clock_source, defintval:0, TYPE_UINT, 0}, \
{"s" , CONFIG_HLP_SNR, 0, iptr:&snr_dB, defintval:25, TYPE_INT, 0}, \
{"T" , CONFIG_HLP_TDD, PARAMFLAG_BOOL, iptr:&tddflag, defintval:0, TYPE_INT, 0}, \
{"A", CONFIG_HLP_TADV, 0, iptr:&(timingadv), defintval:0, TYPE_INT, 0} \
}
@@ -197,6 +196,7 @@
{"d" , CONFIG_HLP_SOFTS, PARAMFLAG_BOOL, uptr:(uint32_t *)&do_forms, defintval:0, TYPE_INT8, 0}, \
{"q" , CONFIG_HLP_STMON, PARAMFLAG_BOOL, iptr:&opp_enabled, defintval:0, TYPE_INT, 0}, \
{"S" , CONFIG_HLP_MSLOTS, PARAMFLAG_BOOL, u8ptr:&exit_missed_slots, defintval:1, TYPE_UINT8, 0}, \
{"s" , CONFIG_HLP_SNR, 0, dblptr:&snr_dB, defdblval:25, TYPE_DOUBLE, 0}, \
{"numerology" , CONFIG_HLP_NUMEROLOGY, PARAMFLAG_BOOL, iptr:&NUMEROLOGY, defintval:0, TYPE_INT, 0}, \
{"parallel-config", CONFIG_HLP_PARALLEL_CMD,0, strptr:(char **)&parallel_config, defstrval:NULL, TYPE_STRING, 0}, \
{"worker-config", CONFIG_HLP_WORKER_CMD, 0, strptr:(char **)&worker_config, defstrval:NULL, TYPE_STRING, 0}, \
@@ -277,6 +277,7 @@ uint64_t get_pdcp_optmask(void);
extern pthread_cond_t sync_cond;
extern pthread_mutex_t sync_mutex;
extern int sync_var;
extern double snr_dB;
extern uint32_t downlink_frequency[MAX_NUM_CCs][4];
targets/RT/USER/lte-uesoftmodem.c
+1 -2
View File
@@ -131,7 +131,6 @@ int32_t uplink_frequency_offset[MAX_NUM_CCs][4];
int UE_scan = 1;
int UE_scan_carrier = 0;
int snr_dB=25;
runmode_t mode = normal_txrx;
@@ -810,7 +809,7 @@ int main( int argc, char **argv ) {
//p_exmimo_config->framing.tdd_config = TXRXSWITCH_TESTRX;
if (IS_SOFTMODEM_SIML1 ) {
init_ocm((double)snr_dB,0);
init_ocm(snr_dB,0);
PHY_vars_UE_g[0][0]->no_timing_correction = 1;
}