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changes to integrate fixed-point polar decoder

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This commit is contained in:
Raymond Knopp
2018-10-10 17:19:57 +02:00
parent 80060d9e56
commit a780c31d0a
2 changed files with 29 additions and 18 deletions
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openair1/PHY/NR_UE_TRANSPORT/nr_pbch.c
+27 -16
View File
@@ -399,7 +399,7 @@ void nr_pbch_unscrambling(NR_UE_PBCH *pbch,
int i;
uint8_t reset, offset;
uint32_t x1, x2, s=0;
double *demod_pbch_e = pbch->demod_pbch_e;
int16_t *demod_pbch_e = pbch->llr;
uint32_t *pbch_a_prime = (uint32_t*)pbch->pbch_a_prime;
uint32_t *pbch_a_interleaved = (uint32_t*)pbch->pbch_a_interleaved;
uint32_t unscrambling_mask = 0x100006D;
@@ -481,9 +481,9 @@ void nr_pbch_alamouti(NR_DL_FRAME_PARMS *frame_parms,
}
void nr_pbch_quantize(int8_t *pbch_llr8,
int16_t *pbch_llr,
uint16_t len)
void nr_pbch_quantize(int16_t *pbch_llr8,
int16_t *pbch_llr,
uint16_t len)
{
uint16_t i;
@@ -498,10 +498,11 @@ void nr_pbch_quantize(int8_t *pbch_llr8,
}
}
/*
unsigned char sign(int8_t x) {
return (unsigned char)x >> 7;
}
*/
uint8_t pbch_deinterleaving_pattern[32] = {28,0,31,30,1,29,25,27,22,2,24,3,4,5,6,7,18,21,20,8,9,10,11,19,26,12,13,14,15,16,23,17};
@@ -533,18 +534,27 @@ int nr_rx_pbch( PHY_VARS_NR_UE *ue,
uint8_t ssb_index=0;
//uint16_t crc;
//short nr_demod_table[8] = {0,0,0,1,1,0,1,1};
double nr_demod_table[8] = {0.707,0.707,-0.707,0.707,0.707,-0.707,-0.707,-0.707};
double *demod_pbch_e = malloc (sizeof(double) * 864);
//double nr_demod_table[8] = {0.707,0.707,-0.707,0.707,0.707,-0.707,-0.707,-0.707};
//int16_t *demod_pbch_e; // = malloc (sizeof(int16_t) * 864);
unsigned short idx_demod =0;
int8_t decoderState=0;
uint8_t decoderListSize = 8, pathMetricAppr = 0;
double aPrioriArray[frame_parms->pbch_polar_params.payloadBits]; // assume no a priori knowledge available about the payload.
time_stats_t polar_decoder_init,polar_rate_matching,decoding,bit_extraction,deinterleaving;
time_stats_t path_metric,sorting,update_LLR;
memset(&pbch_a[0], 0, sizeof(uint8_t) * NR_POLAR_PBCH_PAYLOAD_BITS);
//printf("nr_pbch_ue nid_cell %d\n",frame_parms->Nid_cell);
for (int i=0; i<frame_parms->pbch_polar_params.payloadBits; i++) aPrioriArray[i] = NAN;
reset_meas(&polar_decoder_init);
reset_meas(&polar_rate_matching);
reset_meas(&decoding);
reset_meas(&bit_extraction);
reset_meas(&deinterleaving);
reset_meas(&sorting);
reset_meas(&path_metric);
reset_meas(&update_LLR);
int subframe_rx = proc->subframe_rx;
@@ -597,14 +607,14 @@ int nr_rx_pbch( PHY_VARS_NR_UE *ue,
nr_ue_pbch_vars->rxdataF_comp,
symbol);*/
/*
if (mimo_mode == ALAMOUTI) {
nr_pbch_alamouti(frame_parms,nr_ue_pbch_vars->rxdataF_comp,symbol);
} else if (mimo_mode != SISO) {
msg("[PBCH][RX] Unsupported MIMO mode\n");
return(-1);
}
*/
if (symbol==6) {
nr_pbch_quantize(pbch_e_rx,
(short*)&(nr_ue_pbch_vars->rxdataF_comp[0][symbol*240]),
@@ -623,7 +633,7 @@ int nr_rx_pbch( PHY_VARS_NR_UE *ue,
}
pbch_e_rx = nr_ue_pbch_vars->llr;
demod_pbch_e = nr_ue_pbch_vars->demod_pbch_e;
//demod_pbch_e = nr_ue_pbch_vars->demod_pbch_e;
pbch_a = nr_ue_pbch_vars->pbch_a;
pbch_a_prime = nr_ue_pbch_vars->pbch_a_prime;
@@ -634,7 +644,7 @@ int nr_rx_pbch( PHY_VARS_NR_UE *ue,
for (int cnt = 0; cnt < 8 ; cnt++)
printf("pbch rx llr %d rxdata_comp %d addr %p\n",*(pbch_e_rx+cnt), p[cnt], &p[0]);
//#endif
/*
for (i=0; i<NR_POLAR_PBCH_E/2; i++){
idx_demod = (sign(pbch_e_rx[i<<1])&1) ^ ((sign(pbch_e_rx[(i<<1)+1])&1)<<1);
demod_pbch_e[i<<1] = nr_demod_table[(idx_demod)<<1];
@@ -646,19 +656,20 @@ int nr_rx_pbch( PHY_VARS_NR_UE *ue,
printf("demod_pbch_e[%d] r = %2.3f i = %2.3f\n", i<<1 , demod_pbch_e[i<<1], demod_pbch_e[(i<<1)+1]);}
#endif
}
*/
//un-scrambling
M = NR_POLAR_PBCH_E;
nushift = (Lmax==4)? ssb_index&3 : ssb_index&7;
nr_pbch_unscrambling(nr_ue_pbch_vars,frame_parms->Nid_cell,nushift,M,NR_POLAR_PBCH_E,0);
/*
//#ifdef DEBUG_PBCH
for (i=0; i<16; i++){
printf("unscrambling demod_pbch_e[%d] r = %2.3f i = %2.3f\n", i<<1 , demod_pbch_e[i<<1], demod_pbch_e[(i<<1)+1]);}
//#endif
*/
//polar decoding de-rate matching
decoderState = polar_decoder(demod_pbch_e, pbch_a_b, &frame_parms->pbch_polar_params, decoderListSize, aPrioriArray, pathMetricAppr);
decoderState = polar_decoder_int8_new(pbch_e_rx, pbch_a_b, &frame_parms->pbch_polar_params, decoderListSize, &polar_decoder_init,&polar_rate_matching, &decoding,&bit_extraction,&deinterleaving, &sorting,&path_metric,&update_LLR,0);
printf("polar decoder state %d\n", decoderState);
if(decoderState == -1)
return(decoderState);
openair1/PHY/defs_nr_UE.h
+2 -2
View File
@@ -924,10 +924,10 @@ typedef struct {
uint8_t pbch_a_interleaved[NR_POLAR_PBCH_PAYLOAD_BITS>>3];
uint8_t pbch_a_prime[NR_POLAR_PBCH_PAYLOAD_BITS>>3];
uint8_t pbch_e[NR_POLAR_PBCH_E];
double demod_pbch_e[NR_POLAR_PBCH_E];
int16_t demod_pbch_e[NR_POLAR_PBCH_E];
/// \brief Pointer to PBCH llrs.
/// - first index: ? [0..1919] (hard coded)
int8_t *llr;
int16_t *llr;
/// \brief Pointer to PBCH decoded output.
/// - first index: ? [0..63] (hard coded)
uint8_t *decoded_output;