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Scrambling updates

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This commit is contained in:
Guy De Souza
2018-07-09 16:49:54 +02:00
parent f16d6127bf
commit 3716e921f6
3 changed files with 31 additions and 18 deletions
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openair1/PHY/NR_TRANSPORT/nr_pbch.c
+26 -15
View File
@@ -131,14 +131,19 @@ int nr_generate_pbch_dmrs(uint32_t *gold_pbch_dmrs,
return 0;
}
void nr_pbch_scrambling(uint32_t Nid,
void nr_pbch_scrambling(NR_gNB_PBCH *pbch,
uint32_t Nid,
uint8_t nushift,
uint8_t *pbch_a,
uint16_t M,
uint16_t length)
uint16_t length,
uint8_t bitwise)
{
uint8_t reset, offset;
uint32_t x1, x2, s=0;
uint8_t *pbch_e = pbch->pbch_e;
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 = 0x87002D;
reset = 1;
// x1 is set in lte_gold_generic
@@ -157,7 +162,12 @@ void nr_pbch_scrambling(uint32_t Nid,
s = lte_gold_generic(&x1, &x2, reset);
reset = 0;
}
pbch_a[i] = (pbch_a[i]&1) ^ ((s>>((i+offset)&0x1f))&1);
if (bitwise) {
(*pbch_a_prime) ^= ((unscrambling_mask>>i)&1)? (((*pbch_a_interleaved)>>i)&1)<<i : ((((*pbch_a_interleaved)>>i)&1) ^ ((s>>((i+offset)&0x1f))&1))<<i;
}
else
pbch_e[i] = (pbch_e[i]&1) ^ ((s>>((i+offset)&0x1f))&1);
}
}
@@ -167,11 +177,11 @@ uint8_t nr_pbch_payload_interleaving_pattern[32] = {16, 23, 18, 17, 8, 30, 10, 6
uint8_t nr_pbch_payload_interleaver(uint8_t i) {
uint8_t j_sfn=0, j_hrf=10, j_ssb=11, j_other=14;
if (24<=i && i<=27) //sfn bits
if (24<=i && i<=27) //Sfn bits
return nr_pbch_payload_interleaving_pattern[j_sfn + i -24];
else if (i == 28) // Hrf bit
else if (i==28) // Hrf bit
return nr_pbch_payload_interleaving_pattern[j_hrf];
else if (29<=i) // SSB bits
else if (29<=i) // Ssb bits
return nr_pbch_payload_interleaving_pattern[j_ssb + (i-29)];
else
return nr_pbch_payload_interleaving_pattern[j_other + i];
@@ -207,7 +217,7 @@ int nr_generate_pbch(NR_gNB_PBCH *pbch,
#ifdef DEBUG_PBCH_ENCODING
printf("Byte endian fix:\n");
for (int i=0; i<4; i++)
printf("pbch_a[%d]: 0x%08x\n", i, pbch->pbch_a[i]);
printf("pbch_a[%d]: 0x%04x\n", i, pbch->pbch_a[i]);
#endif
@@ -227,7 +237,7 @@ int nr_generate_pbch(NR_gNB_PBCH *pbch,
#ifdef DEBUG_PBCH_ENCODING
printf("Extra byte:\n");
for (int i=0; i<4; i++)
printf("pbch_a[%d]: 0x%08x\n", i, pbch->pbch_a[i]);
printf("pbch_a[%d]: 0x%04x\n", i, pbch->pbch_a[i]);
#endif
// Payload interleaving
@@ -238,26 +248,28 @@ int nr_generate_pbch(NR_gNB_PBCH *pbch,
#ifdef DEBUG_PBCH_ENCODING
printf("Interleaving:\n");
for (int i=0; i<4; i++)
printf("pbch_a_interleaved[%d]: 0x%08x\n", i, pbch->pbch_a_interleaved[i]);
printf("pbch_a_interleaved[%d]: 0x%04x\n", i, pbch->pbch_a_interleaved[i]);
#endif
// Scrambling
M = NR_POLAR_PBCH_PAYLOAD_BITS - 3; // case Lmax = 4--> 29
nr_pbch_scrambling((uint32_t)config->sch_config.physical_cell_id.value, nushift, pbch->pbch_a_interleaved, M, NR_POLAR_PBCH_PAYLOAD_BITS);
M = (Lmax == 64)? (NR_POLAR_PBCH_PAYLOAD_BITS - 6) : (NR_POLAR_PBCH_PAYLOAD_BITS - 3);
nushift = (((sfn>>2)&1)<<1) ^ ((sfn>>1)&1);
nr_pbch_scrambling(pbch, (uint32_t)config->sch_config.physical_cell_id.value, nushift, M, NR_POLAR_PBCH_PAYLOAD_BITS, 1);
#ifdef DEBUG_PBCH_ENCODING
#endif
/// CRC, coding and rate matching
polar_encoder (pbch->pbch_a, pbch->pbch_e, &frame_parms->pbch_polar_params);
polar_encoder (pbch->pbch_a_prime, pbch->pbch_e, &frame_parms->pbch_polar_params);
#ifdef DEBUG_PBCH_ENCODING
#endif
/// Scrambling
M = NR_POLAR_PBCH_E;
nr_pbch_scrambling((uint32_t)config->sch_config.physical_cell_id.value, nushift, pbch->pbch_a, M, NR_POLAR_PBCH_E);
nushift = config->sch_config.physical_cell_id.value &3;;
nr_pbch_scrambling(pbch, (uint32_t)config->sch_config.physical_cell_id.value, nushift, M, NR_POLAR_PBCH_E, 0);
/// QPSK modulation
for (int i=0; i<NR_POLAR_PBCH_E>>1; i++){
@@ -271,7 +283,6 @@ int nr_generate_pbch(NR_gNB_PBCH *pbch,
}
/// Resource mapping
nushift = config->sch_config.physical_cell_id.value &3;
a = (config->rf_config.tx_antenna_ports.value == 1) ? amp : (amp*ONE_OVER_SQRT2_Q15)>>15;
for (int aa = 0; aa < config->rf_config.tx_antenna_ports.value; aa++)
openair1/PHY/NR_TRANSPORT/nr_transport.h
+4 -3
View File
@@ -70,11 +70,12 @@ int nr_generate_pbch_dmrs(uint32_t *gold_pbch_dmrs,
\brief PBCH scrambling function
@param
*/
void nr_pbch_scrambling(uint32_t Nid,
void nr_pbch_scrambling(NR_gNB_PBCH *pbch,
uint32_t Nid,
uint8_t nushift,
uint8_t *pbch_a,
uint16_t M,
uint16_t length);
uint16_t length,
uint8_t bitwise);
/*!
\fn int nr_generate_pbch
openair1/PHY/defs_gNB.h
+1
View File
@@ -40,6 +40,7 @@
typedef struct {
uint8_t pbch_a[NR_POLAR_PBCH_PAYLOAD_BITS>>3];
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];
} NR_gNB_PBCH;