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srsRAN_4G
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Turbo Coder LUT not a function of CB size

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master
Ismael Gomez 7 years ago committed by Xavier Arteaga
parent 800eea888f
commit 3a9f224f40
1 changed files with 33 additions and 33 deletions
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18
lib/src/phy/fec/turbocoder.c
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@ -46,7 +46,7 @@ typedef struct {
uint8_t output; uint8_t output;
} tcod_lut_t; } tcod_lut_t;
static tcod_lut_t tcod_lut[188][8][256]; static tcod_lut_t tcod_lut[8][256];
static uint16_t tcod_per_fw[188][6144]; static uint16_t tcod_per_fw[188][6144];
static srslte_bit_interleaver_t tcod_interleavers[188]; static srslte_bit_interleaver_t tcod_interleavers[188];
@ -219,7 +219,7 @@ int srslte_tcod_encode_lut(srslte_tcod_t *h, srslte_crc_t *crc, uint8_t *input,
srslte_crc_checksum_put_byte(crc, in); srslte_crc_checksum_put_byte(crc, in);
/* Run actual encoder */ /* Run actual encoder */
tcod_lut_t l = tcod_lut[cblen_idx][state0][in]; tcod_lut_t l = tcod_lut[state0][in];
parity[i] = l.output; parity[i] = l.output;
state0 = l.next_state; state0 = l.next_state;
} }
@ -231,7 +231,7 @@ int srslte_tcod_encode_lut(srslte_tcod_t *h, srslte_crc_t *crc, uint8_t *input,
uint8_t in = (uint8_t) ((checksum >> mask_shift) & 0xff); uint8_t in = (uint8_t) ((checksum >> mask_shift) & 0xff);
input[idx] = in; input[idx] = in;
tcod_lut_t l = tcod_lut[cblen_idx][state0][in]; tcod_lut_t l = tcod_lut[state0][in];
parity[idx] = l.output; parity[idx] = l.output;
state0 = l.next_state; state0 = l.next_state;
} }
@ -239,7 +239,7 @@ int srslte_tcod_encode_lut(srslte_tcod_t *h, srslte_crc_t *crc, uint8_t *input,
} else { } else {
/* No CRC given */ /* No CRC given */
for (uint32_t i = 0; i < long_cb / 8; i++) { for (uint32_t i = 0; i < long_cb / 8; i++) {
tcod_lut_t l = tcod_lut[cblen_idx][state0][input[i]]; tcod_lut_t l = tcod_lut[state0][input[i]];
parity[i] = l.output; parity[i] = l.output;
state0 = l.next_state; state0 = l.next_state;
} }
@ -253,7 +253,7 @@ int srslte_tcod_encode_lut(srslte_tcod_t *h, srslte_crc_t *crc, uint8_t *input,
/* Parity bits for the 2nd constituent encoders */ /* Parity bits for the 2nd constituent encoders */
uint8_t state1 = 0; uint8_t state1 = 0;
for (uint32_t i=0;i<long_cb/8;i++) { for (uint32_t i=0;i<long_cb/8;i++) {
tcod_lut_t l = tcod_lut[cblen_idx][state1][h->temp[i]]; tcod_lut_t l = tcod_lut[state1][h->temp[i]];
uint8_t out = l.output; uint8_t out = l.output;
parity[long_cb/8+i] |= (out&0xf0)>>4; parity[long_cb/8+i] |= (out&0xf0)>>4;
parity[long_cb/8+i+1] = (out&0xf)<<4; parity[long_cb/8+i+1] = (out&0xf)<<4;
@ -351,6 +351,7 @@ void srslte_tcod_gentable() {
for (uint32_t i = long_cb; i < 6144; i++) { for (uint32_t i = long_cb; i < 6144; i++) {
tcod_per_fw[len][i] = 0; tcod_per_fw[len][i] = 0;
} }
}
// Compute state transitions // Compute state transitions
for (uint32_t state=0;state<8;state++) { for (uint32_t state=0;state<8;state++) {
for (uint32_t data=0;data<256;data++) { for (uint32_t data=0;data<256;data++) {
@ -360,7 +361,7 @@ void srslte_tcod_gentable() {
reg_1 = (state&2)>>1; reg_1 = (state&2)>>1;
reg_2 = state&1; reg_2 = state&1;
tcod_lut[len][state][data].output = 0; tcod_lut[state][data].output = 0;
uint8_t bit, in, out; uint8_t bit, in, out;
for (uint32_t i = 0; i < 8; i++) { for (uint32_t i = 0; i < 8; i++) {
bit = (data&(1<<(7-i)))?1:0; bit = (data&(1<<(7-i)))?1:0;
@ -372,11 +373,10 @@ void srslte_tcod_gentable() {
reg_1 = reg_0; reg_1 = reg_0;
reg_0 = in; reg_0 = in;
tcod_lut[len][state][data].output |= out<<(7-i); tcod_lut[state][data].output |= out<<(7-i);
} }
tcod_lut[len][state][data].next_state = (uint8_t) ((reg_0 << 2 | reg_1 << 1 | reg_2) % 8); tcod_lut[state][data].next_state = (uint8_t) ((reg_0 << 2 | reg_1 << 1 | reg_2) % 8);
}
} }
} }

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