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add channel simulator in rfsimulator

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This commit is contained in:
laurent
2019-06-06 15:11:08 +02:00
parent cba073631f
commit 8c16f16cbf
1 changed files with 13 additions and 15 deletions
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targets/ARCH/rfsimulator/simulator.c
+13 -15
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@@ -104,9 +104,8 @@ void rxAddInput( struct complex16 *input_sig, struct complex16 *after_channel_si
// 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;
const double rxGain= 132.24 - snr_dB;
const double noise_per_sample = sqrt(0.5*noise_figure_watt) * pow(10,rxGain/20);
// 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);
@@ -136,20 +135,20 @@ void rxAddInput( struct complex16 *input_sig, struct complex16 *after_channel_si
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,
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_I(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));
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) {
@@ -541,14 +540,13 @@ int rfsimulator_read(openair0_device *device, openair0_timestamp *ptimestamp, vo
if (reGenerateChannel)
random_channel(ptr->channel_model,0);
for (int a=0; a<nbAnt; a++)
rxAddInput( ptr->circularBuf, (struct complex16 *) samplesVoid[a],
for (int a=0; a<nbAnt; a++)
rxAddInput( ptr->circularBuf, (struct complex16 *) samplesVoid[a],
a,
ptr->channel_model,
nsamps,
t->nextTimestamp
);
}
}
@@ -587,9 +585,9 @@ int rfsimulator_set_gains(openair0_device *device, openair0_config_t *openair0_c
}
__attribute__((__visibility__("default")))
int device_init(openair0_device *device, openair0_config_t *openair0_cfg) {
//set_log(HW,OAILOG_DEBUG);
set_log(TMR,OAILOG_DEBUG);
//set_log(PHY,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 ) {