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First X310 Calibration and harmonization of B210 and X310 configuration

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This commit is contained in:
Rohit Gupta
2015-11-12 20:30:03 +01:00
parent a208ba8ce8
commit 551a272192
4 changed files with 51 additions and 13 deletions
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targets/ARCH/COMMON/common_lib.h
+4
View File
@@ -98,6 +98,10 @@ typedef struct {
//! \brief Center frequency in Hz for TX.
//! index: [0..rx_num_channels[ !!! see lte-ue.c:427 FIXME iterates over rx_num_channels
double tx_freq[4];
//! \brief Pointer to Calibration table for RX gains
rx_gain_calib_table_t *rx_gain_calib_table;
//! mode for rxgain (ExpressMIMO2)
rx_gain_t rxg_mode[4];
//! \brief Gain for RX in dB.
targets/ARCH/USRP/USERSPACE/LIB/usrp_lib.cpp
+37 -8
View File
@@ -171,17 +171,30 @@ static int trx_usrp_read(openair0_device *device, openair0_timestamp *ptimestamp
#endif
/*
if (cc>1) {
// receive multiple channels (e.g. RF A and RF B)
std::vector<void *> buff_ptrs;
for (int i=0;i<cc;i++) buff_ptrs.push_back(buff_tmp[i]);
samples_received = s->rx_stream->recv(buff_ptrs, nsamps, s->rx_md);
} else {
// receive a single channel (e.g. from connector RF A)
samples_received = s->rx_stream->recv(buff_tmp[0], nsamps, s->rx_md);
}*/
if (cc>1) {
// receive multiple channels (e.g. RF A and RF B)
std::vector<void *> buff_ptrs;
for (int i=0;i<cc;i++) buff_ptrs.push_back(buff[i]);
samples_received = s->rx_stream->recv(buff_ptrs, nsamps, s->rx_md);
} else {
// receive a single channel (e.g. from connector RF A)
samples_received = s->rx_stream->recv(buff[0], nsamps, s->rx_md);
}
/*
// bring RX data into 12 LSBs for softmodem RX
for (int i=0;i<cc;i++) {
for (int j=0; j<nsamps2; j++) {
@@ -196,6 +209,8 @@ static int trx_usrp_read(openair0_device *device, openair0_timestamp *ptimestamp
#endif
}
}
*/
if (samples_received < nsamps) {
printf("[recv] received %d samples out of %d\n",samples_received,nsamps);
@@ -279,7 +294,7 @@ int trx_usrp_set_gains(openair0_device* device,
exit(-1);
}
s->usrp->set_rx_gain(openair0_cfg[0].rx_gain[0]-openair0_cfg[0].rx_gain_offset[0]);
printf("Setting USRP RX gain to %f\n", openair0_cfg[0].rx_gain[0]-openair0_cfg[0].rx_gain_offset[0]);
printf("Setting USRP RX gain to %f (rx_gain %f,gain_range.stop() %f)\n", openair0_cfg[0].rx_gain[0]-openair0_cfg[0].rx_gain_offset[0],openair0_cfg[0].rx_gain[0],gain_range.stop());
return(0);
}
@@ -289,7 +304,7 @@ int trx_usrp_stop(int card) {
}
rx_gain_calib_table_t calib_table[] = {
rx_gain_calib_table_t calib_table_b210[] = {
{3500000000.0,46.0},
{2660000000.0,53.0},
{2300000000.0,54.0},
@@ -297,19 +312,29 @@ rx_gain_calib_table_t calib_table[] = {
{816000000.0,62.0},
{-1,0}};
rx_gain_calib_table_t calib_table_x310[] = {
{3500000000.0,77.0},
{2660000000.0,80.0},
{2300000000.0,81.0},
{1880000000.0,82.0},
{816000000.0,89},
{-1,0}};
void set_rx_gain_offset(openair0_config_t *openair0_cfg, int chain_index) {
int i=0;
// loop through calibration table to find best adjustment factor for RX frequency
double min_diff = 6e9,diff;
while (calib_table[i].freq>0) {
diff = fabs(openair0_cfg->rx_freq[chain_index] - calib_table[i].freq);
while (openair0_cfg->rx_gain_calib_table[i].freq>0) {
diff = fabs(openair0_cfg->rx_freq[chain_index] - openair0_cfg->rx_gain_calib_table[i].freq);
printf("cal %d: freq %f, offset %f, diff %f\n",
i,calib_table[i].freq,calib_table[i].offset,diff);
i,
openair0_cfg->rx_gain_calib_table[i].freq,
openair0_cfg->rx_gain_calib_table[i].offset,diff);
if (min_diff > diff) {
min_diff = diff;
openair0_cfg->rx_gain_offset[chain_index] = calib_table[i].offset;
openair0_cfg->rx_gain_offset[chain_index] = openair0_cfg->rx_gain_calib_table[i].offset;
}
i++;
}
@@ -375,6 +400,8 @@ int openair0_dev_init_usrp(openair0_device* device, openair0_config_t *openair0_
// this is not working yet, master clock has to be set via constructor
// set master clock rate and sample rate for tx & rx for streaming
//s->usrp->set_master_clock_rate(usrp_master_clock);
openair0_cfg[0].rx_gain_calib_table = calib_table_x310;
} else {
printf("Found USRP B200");
s->usrp = uhd::usrp::multi_usrp::make(args);
@@ -387,6 +414,8 @@ int openair0_dev_init_usrp(openair0_device* device, openair0_config_t *openair0_
// s->usrp->set_clock_source("internal");
// set master clock rate and sample rate for tx & rx for streaming
s->usrp->set_master_clock_rate(30.72e6);
openair0_cfg[0].rx_gain_calib_table = calib_table_b210;
}
targets/RT/USER/lte-softmodem.c
+9 -5
View File
@@ -2965,24 +2965,28 @@ openair0_cfg[card].num_rb_dl=frame_parms[0]->N_RB_DL;
else {
openair0_cfg[card].rx_gain[i] = PHY_vars_UE_g[0][0]->rx_total_gain_dB;// - USRP_GAIN_OFFSET; // calibrated for USRP B210 @ 2.6 GHz, 30.72 MS/s
}
switch(frame_parms[0]->N_RB_DL) {
case 6:
openair0_cfg[card].rx_gain[i] -= 6;
openair0_cfg[card].rx_gain[i] -= 12;
break;
case 25:
openair0_cfg[card].rx_gain[i] += 6;
openair0_cfg[card].rx_gain[i] -= 6;
break;
case 50:
openair0_cfg[card].rx_gain[i] += 8;
openair0_cfg[card].rx_gain[i] -= 3;
break;
case 100:
openair0_cfg[card].rx_gain[i] -= 0;
break;
default:
break;
}
}
targets/RT/USER/lte-ue.c
+1
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@@ -410,6 +410,7 @@ static void *UE_thread_synch(void *arg)
UE->UE_scan_carrier = 0;
// rerun with new cell parameters and frequency-offset
for (i=0;i<openair0_cfg[0].rx_num_channels;i++) {
openair0_cfg[0].rx_gain[i] = UE->rx_total_gain_dB;//-USRP_GAIN_OFFSET;
openair0_cfg[0].rx_freq[i] -= UE->lte_ue_common_vars.freq_offset;
openair0_cfg[0].tx_freq[i] = openair0_cfg[0].rx_freq[i]+uplink_frequency_offset[0][i];
downlink_frequency[0][i] = openair0_cfg[0].rx_freq[i];