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srsLTE
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Improved ACK and RI in PUSCH decoding

This commit is contained in:
Xavier Arteaga 2017-09-08 10:41:52 +02:00 committed by Ismael Gomez
parent d9b6ae7563
commit 8fd8175320
1 changed files with 25 additions and 31 deletions
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56
lib/src/phy/phch/uci.c
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@ -582,35 +582,25 @@ static uint32_t encode_ri_ack(uint8_t data[2], uint32_t data_len, srslte_uci_bit
return i;
}
static void decode_ri_ack(int16_t *q_bits, uint8_t *c_seq, srslte_uci_bit_t *pos, uint32_t Qm, int32_t data[2], uint32_t nof_data)
static void decode_ri_ack(int16_t *q_bits, uint8_t *c_seq, srslte_uci_bit_t *pos, uint32_t Qm, int32_t data[3])
{
if (nof_data == 1) {
uint32_t p0 = pos[0].position;
uint32_t p1 = pos[1].position;
uint32_t p0 = pos[Qm * 0 + 0].position;
uint32_t p1 = pos[Qm * 0 + 1].position;
uint32_t p2 = pos[Qm * 1 + 0].position;
uint32_t p3 = pos[Qm * 1 + 1].position;
uint32_t p4 = pos[Qm * 2 + 0].position;
uint32_t p5 = pos[Qm * 2 + 1].position;
int32_t q0 = c_seq[p0] ? q_bits[p0] : -q_bits[p0];
int32_t q1 = c_seq[p0] ? q_bits[p1] : -q_bits[p1];
int32_t q0 = c_seq[p0] ? q_bits[p0] : -q_bits[p0];
int32_t q1 = c_seq[p1] ? q_bits[p1] : -q_bits[p1];
int32_t q2 = c_seq[p2] ? q_bits[p2] : -q_bits[p2];
int32_t q3 = c_seq[p3] ? q_bits[p3] : -q_bits[p3];
int32_t q4 = c_seq[p4] ? q_bits[p4] : -q_bits[p4];
int32_t q5 = c_seq[p5] ? q_bits[p5] : -q_bits[p5];
data[0] -= q0 + q1;
} else {
uint32_t p0 = pos[Qm * 0 + 0].position;
uint32_t p1 = pos[Qm * 0 + 1].position;
uint32_t p2 = pos[Qm * 1 + 6].position;
uint32_t p3 = pos[Qm * 1 + 7].position;
uint32_t p4 = pos[Qm * 2 + 12].position;
uint32_t p5 = pos[Qm * 2 + 13].position;
int32_t q0 = c_seq[p0] ? q_bits[p0] : -q_bits[p0];
int32_t q1 = c_seq[p1] ? q_bits[p1] : -q_bits[p1];
int32_t q2 = c_seq[p2] ? q_bits[p2] : -q_bits[p2];
int32_t q3 = c_seq[p3] ? q_bits[p3] : -q_bits[p3];
int32_t q4 = c_seq[p4] ? q_bits[p4] : -q_bits[p4];
int32_t q5 = c_seq[p5] ? q_bits[p5] : -q_bits[p5];
data[0] -= q0 + q3;
data[1] -= q1 + q4;
data[2] -= q2 + q5;
}
data[0] -= q0 + q3;
data[1] -= q1 + q4;
data[2] -= q2 + q5;
}
@ -631,9 +621,11 @@ int srslte_uci_decode_ack(srslte_pusch_cfg_t *cfg, int16_t *q_bits, uint8_t *c_s
uint32_t Qprime = Q_prime_ri_ack(cfg, nof_acks, O_cqi, beta);
// Use the same interleaver function to get the HARQ bit position
for (uint32_t i = 0; i < Qprime; i += (nof_acks > 1) ? 3 : 1) {
for (uint32_t i = 0; i < Qprime; i++) {
uci_ulsch_interleave_ack_gen(i, cfg->grant.Qm, H_prime_total, cfg->nbits.nof_symb, cfg->cp, &ack_bits[cfg->grant.Qm*i]);
decode_ri_ack(q_bits, c_seq, ack_bits, cfg->grant.Qm, acks_sum, nof_acks);
if ((i % 3 == 0) && i > 0) {
decode_ri_ack(q_bits, &c_seq[0], &ack_bits[cfg->grant.Qm*(i-3)], cfg->grant.Qm, acks_sum);
}
}
if (acks) {
@ -676,7 +668,7 @@ int srslte_uci_decode_ri(srslte_pusch_cfg_t *cfg, int16_t *q_bits, uint8_t *c_se
float beta, uint32_t H_prime_total,
uint32_t O_cqi, srslte_uci_bit_t *ri_bits, uint8_t *data)
{
int32_t rx_ri = 0;
int32_t ri_sum[3] = {0, 0, 0};
if (beta < 0) {
fprintf(stderr, "Error beta is reserved\n");
@ -688,11 +680,13 @@ int srslte_uci_decode_ri(srslte_pusch_cfg_t *cfg, int16_t *q_bits, uint8_t *c_se
// Use the same interleaver function to get the HARQ bit position
for (uint32_t i=0;i<Qprime;i++) {
uci_ulsch_interleave_ri_gen(i, cfg->grant.Qm, H_prime_total, cfg->nbits.nof_symb, cfg->cp, &ri_bits[cfg->grant.Qm*i]);
decode_ri_ack(q_bits, c_seq, ri_bits, cfg->grant.Qm, &rx_ri, 1);
if ((i % 3 == 0) && i > 0) {
decode_ri_ack(q_bits, &c_seq[0], &ri_bits[cfg->grant.Qm*(i-3)], cfg->grant.Qm, ri_sum);
}
}
if (data) {
*data = rx_ri>0;
*data = (uint8_t) ((ri_sum[0] + ri_sum[1] + ri_sum[2]) > 0);
}
return (int) Qprime;