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fix for TDD: TX is powered on a few samples earlier to allow it to settle before start of DL

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This commit is contained in:
Florian Kaltenberger
2017-10-19 18:03:01 +02:00
committed by Rohit Gupta
parent 55f0fc30bf
commit 4989c0f030
1 changed files with 16 additions and 10 deletions
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targets/RT/USER/lte-enb.c
+16 -10
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@@ -948,12 +948,11 @@ void rx_rf(PHY_VARS_eNB *eNB,int *frame,int *subframe) {
lte_subframe_t SF_type = subframe_select(fp,(proc->subframe_rx+tx_sfoffset)%10);
lte_subframe_t prevSF_type = subframe_select(fp,(proc->subframe_rx+tx_sfoffset+9)%10);
lte_subframe_t nextSF_type = subframe_select(fp,(proc->subframe_rx+tx_sfoffset+1)%10);
int sf_extension = 0;
if ((SF_type == SF_DL) ||
(SF_type == SF_S)) {
for (i=0; i<fp->nb_antennas_tx; i++)
txp[i] = (void*)&eNB->common_vars.txdata[0][i][((proc->subframe_rx+tx_sfoffset)%10)*fp->samples_per_tti];
int siglen=fp->samples_per_tti,flags=1;
if (SF_type == SF_S) {
@@ -962,22 +961,29 @@ void rx_rf(PHY_VARS_eNB *eNB,int *frame,int *subframe) {
}
if ((fp->frame_type == TDD) &&
(SF_type == SF_DL)&&
(prevSF_type == SF_UL) &&
(nextSF_type == SF_DL))
(prevSF_type == SF_UL) &&
(nextSF_type == SF_DL)) {
flags = 2; // start of burst
//sf_extension = eNB->N_TA_offset<<1;
}
if ((fp->frame_type == TDD) &&
(SF_type == SF_DL)&&
(prevSF_type == SF_UL) &&
(nextSF_type == SF_UL))
(nextSF_type == SF_UL)) {
flags = 4; // start of burst and end of burst (only one DL SF between two UL)
//sf_extension = eNB->N_TA_offset<<1;
}
VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME( VCD_SIGNAL_DUMPER_FUNCTIONS_TRX_WRITE, 1 );
VCD_SIGNAL_DUMPER_DUMP_VARIABLE_BY_NAME( VCD_SIGNAL_DUMPER_VARIABLES_TRX_WRITE_FLAGS,flags);
for (i=0; i<fp->nb_antennas_tx; i++)
txp[i] = (void*)&eNB->common_vars.txdata[0][i][((proc->subframe_rx+tx_sfoffset)%10)*fp->samples_per_tti-sf_extension];
txs = eNB->rfdevice.trx_write_func(&eNB->rfdevice,
proc->timestamp_rx+eNB->ts_offset+(tx_sfoffset*fp->samples_per_tti)-openair0_cfg[0].tx_sample_advance,
proc->timestamp_rx+eNB->ts_offset+(tx_sfoffset*fp->samples_per_tti)-openair0_cfg[0].tx_sample_advance-sf_extension,
txp,
siglen,
siglen+sf_extension,
fp->nb_antennas_tx,
flags);
clock_gettime( CLOCK_MONOTONIC, &end_rf);
@@ -991,7 +997,7 @@ void rx_rf(PHY_VARS_eNB *eNB,int *frame,int *subframe) {
if (txs != siglen) {
if (txs != siglen+sf_extension) {
LOG_E(PHY,"TX : Timeout (sent %d/%d)\n",txs, fp->samples_per_tti);
exit_fun( "problem transmitting samples" );
}