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rfsimulator: add support to simulate a long propagation delay

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Add the option `--rfsimulator.prop_delay` to specify the simulated receive-path (gNB: UL, UE: DL) propagation delay in ms.
This option can be used e.g. to simulate a simple GEO satellite channel by specifying `--rfsimulator.prop_delay 238.74` to both, the gNB and the UE.

This is part of the work developed by Fraunhofer IIS within the ESA-funded project 5G-GOA (https://connectivity.esa.int/projects/5ggoa).
This commit is contained in:
Thomas Schlichter
2024-05-07 20:46:37 +02:00
parent 82bd07ebd5
commit 5ac881b7c1
5 changed files with 75 additions and 89 deletions
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openair1/SIMULATION/TOOLS/random_channel.c
+10 -6
View File
@@ -76,7 +76,6 @@ static unsigned int max_chan;
static channel_desc_t **defined_channels;
static char *modellist_name;
void fill_channel_desc(channel_desc_t *chan_desc,
uint8_t nb_tx,
uint8_t nb_rx,
@@ -92,9 +91,10 @@ void fill_channel_desc(channel_desc_t *chan_desc,
double aoa,
double forgetting_factor,
double max_Doppler,
int32_t channel_offset,
uint64_t channel_offset,
double path_loss_dB,
uint8_t random_aoa) {
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",
@@ -568,7 +568,7 @@ channel_desc_t *new_channel_desc_scm(uint8_t nb_tx,
double maxDoppler,
const corr_level_t corr_level,
double forgetting_factor,
int32_t channel_offset,
uint64_t channel_offset,
double path_loss_dB,
float noise_power_dB)
{
@@ -2063,8 +2063,12 @@ static void display_channelmodel(channel_desc_t *cd,int debug, telnet_printfunc_
prnt("nb_tx: %i nb_rx: %i taps: %i bandwidth: %lf sampling: %lf\n",cd->nb_tx, cd->nb_rx, cd->nb_taps, cd->channel_bandwidth, cd->sampling_rate);
prnt("channel length: %i Max path delay: %lf ricean fact.: %lf angle of arrival: %lf (randomized:%s)\n",
cd->channel_length, cd->Td, cd->ricean_factor, cd->aoa, (cd->random_aoa?"Yes":"No"));
prnt("max Doppler: %lf path loss: %lf noise: %lf rchannel offset: %i forget factor; %lf\n",
cd->max_Doppler, cd->path_loss_dB, cd->noise_power_dB, cd->channel_offset, cd->forgetting_factor);
prnt("max Doppler: %lf path loss: %lf noise: %lf rchannel offset: %lu forget factor; %lf\n",
cd->max_Doppler,
cd->path_loss_dB,
cd->noise_power_dB,
cd->channel_offset,
cd->forgetting_factor);
prnt("Initial phase: %lf nb_path: %i \n",
cd->ip, cd->nb_paths);
openair1/SIMULATION/TOOLS/sim.h
+2 -3
View File
@@ -101,7 +101,7 @@ typedef struct {
///path loss including shadow fading in dB
double path_loss_dB;
///additional delay of channel in samples.
int32_t channel_offset;
uint64_t channel_offset;
float noise_power_dB;
///This parameter (0...1) allows for simple 1st order temporal variation. 0 means a new channel every call, 1 means keep channel constant all the time
double forgetting_factor;
@@ -307,7 +307,6 @@ typedef struct {
double ru_amp[NUMBER_OF_RU_MAX];
} sim_t;
channel_desc_t *new_channel_desc_scm(uint8_t nb_tx,
uint8_t nb_rx,
SCM_t channel_model,
@@ -318,7 +317,7 @@ channel_desc_t *new_channel_desc_scm(uint8_t nb_tx,
double maxDoppler,
const corr_level_t corr_level,
double forgetting_factor,
int32_t channel_offset,
uint64_t channel_offset,
double path_loss_dB,
float noise_power_dB);