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Merge branch 'nr-polar-encoder-optimizations' of https://gitlab.eurecom.fr/oai/openairinterface5g into nr-polar-encoder-optimizations

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This commit is contained in:
Raymond Knopp
2018-12-10 08:19:58 +01:00
parent 0ab61e1bab 173801704e
commit 303a463a4d
1 changed files with 24 additions and 16 deletions
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openair1/PHY/NR_TRANSPORT/nr_pbch.c
+24 -16
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@@ -183,15 +183,15 @@ void nr_pbch_scrambling(NR_gNB_PBCH *pbch,
if (!encoded) {
/// 1st Scrambling
for (int i = 0; i < length; ++i) {
if ((unscrambling_mask>>(31-i))&1)
pbch->pbch_a_prime ^= ((pbch->pbch_a_interleaved>>(31-i))&1)<<(31-i);
if ((unscrambling_mask>>i)&1)
pbch->pbch_a_prime ^= ((pbch->pbch_a_interleaved>>i)&1)<<i;
else {
if (((k+offset)&0x1f)==0) {
s = lte_gold_generic(&x1, &x2, reset);
reset = 0;
}
pbch->pbch_a_prime ^= (((pbch->pbch_a_interleaved>>(31-i))&1) ^ ((s>>((k+offset)&0x1f))&1))<<(31-i);
pbch->pbch_a_prime ^= (((pbch->pbch_a_interleaved>>i)&1) ^ ((s>>((k+offset)&0x1f))&1))<<i;
k++; /// k increase only when payload bit is not special bit
}
}
@@ -215,17 +215,18 @@ void nr_init_pbch_interleaver(uint8_t *interleaver) {
for (uint8_t i=0; i<NR_POLAR_PBCH_PAYLOAD_BITS; i++)
if (!i) // choice bit:1
*(interleaver+i) = *(nr_pbch_payload_interleaving_pattern+31-j_other++);
*(interleaver+i) = *(nr_pbch_payload_interleaving_pattern+j_other++);
else if (i<7) //Sfn bits:6
*(interleaver+i) = *(nr_pbch_payload_interleaving_pattern+31-j_sfn++);
*(interleaver+i) = *(nr_pbch_payload_interleaving_pattern+j_sfn++);
else if (i<24) // other:17
*(interleaver+i) = *(nr_pbch_payload_interleaving_pattern+31-j_other++);
*(interleaver+i) = *(nr_pbch_payload_interleaving_pattern+j_other++);
else if (i<28) // Sfn:4
*(interleaver+i) = *(nr_pbch_payload_interleaving_pattern+31-j_sfn++);
*(interleaver+i) = *(nr_pbch_payload_interleaving_pattern+j_sfn++);
else if (i==28) // Hrf bit:1
*(interleaver+i) = *(nr_pbch_payload_interleaving_pattern+31-j_hrf);
*(interleaver+i) = *(nr_pbch_payload_interleaving_pattern+j_hrf);
else // Ssb bits:3
*(interleaver+i) = *(nr_pbch_payload_interleaving_pattern+31-j_ssb++);
*(interleaver+i) = *(nr_pbch_payload_interleaving_pattern+j_ssb++);
}
int nr_generate_pbch(NR_gNB_PBCH *pbch,
@@ -250,6 +251,7 @@ int nr_generate_pbch(NR_gNB_PBCH *pbch,
uint16_t M;
uint8_t nushift;
uint32_t unscrambling_mask;
uint64_t a_reversed=0;
LOG_I(PHY, "PBCH generation started\n");
@@ -258,7 +260,7 @@ int nr_generate_pbch(NR_gNB_PBCH *pbch,
memset((void*)pbch, 0, sizeof(NR_gNB_PBCH));
pbch->pbch_a=0;
for (int i=0; i<NR_PBCH_PDU_BITS; i++)
pbch->pbch_a |= ((pbch_pdu[2-(i>>3)]>>(7-(i&7)))&1)<<(NR_PBCH_PDU_BITS-i-1);
pbch->pbch_a |= ((pbch_pdu[2-(i>>3)]>>(7-(i&7)))&1)<<i;
#ifdef DEBUG_PBCH_ENCODING
for (int i=0; i<3; i++)
printf("pbch_pdu[%d]: 0x%02x\n", i, pbch_pdu[i]);
@@ -267,15 +269,15 @@ int nr_generate_pbch(NR_gNB_PBCH *pbch,
// Extra byte generation
for (int i=0; i<4; i++)
pbch->pbch_a |= ((sfn>>(3-i))&1)<<(7-i); // resp. 4th, 3rd, 2nd ans 1st lsb of sfn
pbch->pbch_a |= ((sfn>>(3-i))&1)<<(24+i); // resp. 4th, 3rd, 2nd ans 1st lsb of sfn
pbch->pbch_a |= n_hf<<3; // half frame index bit
pbch->pbch_a |= n_hf<<28; // half frame index bit
if (Lmax == 64)
for (int i=0; i<3; i++)
pbch->pbch_a |= ((ssb_index>>(5-i))&1)<<(2-i); // resp. 6th, 5th and 4th bits of ssb_index
pbch->pbch_a |= ((ssb_index>>(5-i))&1)<<(29+i); // resp. 6th, 5th and 4th bits of ssb_index
else
pbch->pbch_a |= ((config->sch_config.ssb_subcarrier_offset.value>>4)&1)<<2; //MSB of k_SSB (bit index 4)
pbch->pbch_a |= ((config->sch_config.ssb_subcarrier_offset.value>>4)&1)<<29; //MSB of k_SSB (bit index 4)
LOG_I(PHY,"After extra byte: pbch_a = 0x%08x\n",pbch->pbch_a);
@@ -294,7 +296,7 @@ int nr_generate_pbch(NR_gNB_PBCH *pbch,
#endif
// Scrambling
unscrambling_mask = (Lmax ==64)? 0xB6000080:0x82000080;
unscrambling_mask = (Lmax ==64)? 0x100006D:0x1000041;
M = (Lmax == 64)? (NR_POLAR_PBCH_PAYLOAD_BITS - 6) : (NR_POLAR_PBCH_PAYLOAD_BITS - 3);
nushift = (((sfn>>2)&1)<<1) ^ ((sfn>>1)&1);
pbch->pbch_a_prime = 0;
@@ -304,8 +306,14 @@ int nr_generate_pbch(NR_gNB_PBCH *pbch,
printf("pbch_a_prime: 0x%08x\n", pbch->pbch_a_prime);
#endif
// Encoder reversal
for (int i=0; i<NR_POLAR_PBCH_PAYLOAD_BITS; i++)
a_reversed |= (((uint64_t)pbch->pbch_a_prime>>i)&1)<<(31-i);
/// CRC, coding and rate matching
polar_encoder_fast ((uint64_t*)&pbch->pbch_a_prime, (uint32_t*)pbch->pbch_e, 0, polar_params);
polar_encoder_fast (&a_reversed, (uint32_t*)pbch->pbch_e, 0, polar_params);
#ifdef DEBUG_PBCH_ENCODING
printf("Channel coding:\n");
for (int i=0; i<NR_POLAR_PBCH_E_DWORD; i++)