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Merge branch 'master' of https://github.com/ismagom/libLTE

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master
ismagom 11 years ago
parent 5e810e8a7d 225ae44e0e
commit c3504cb385
4 changed files with 46 additions and 52 deletions
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39
lte/lib/fec/src/rm_conv.c
Unescape Escape View File

@ -32,7 +32,6 @@
#define NCOLS 32
#define NROWS_MAX NCOLS
#define RATE 3
unsigned char RM_PERM_TC[NCOLS] =
{ 1, 17, 9, 25, 5, 21, 13, 29, 3, 19, 11, 27, 7, 23, 15, 31, 0, 16, 8,
@ -43,19 +42,19 @@ unsigned char RM_PERM_TC_INV[NCOLS] = { 16, 0, 24, 8, 20, 4, 28, 12, 18, 2, 26,
int rm_conv_tx(char *input, int in_len, char *output, int out_len) {
char tmp[RATE * NCOLS * NROWS_MAX];
char tmp[3 * NCOLS * NROWS_MAX];
int nrows, ndummy, K_p;
int i, j, k, s;
nrows = (int) (in_len / RATE - 1) / NCOLS + 1;
nrows = (int) (in_len / 3 - 1) / NCOLS + 1;
if (nrows > NROWS_MAX) {
fprintf(stderr, "Input too large. Max input length is %d\n",
RATE * NCOLS * NROWS_MAX);
3 * NCOLS * NROWS_MAX);
return -1;
}
K_p = nrows * NCOLS;
ndummy = K_p - in_len / RATE;
ndummy = K_p - in_len / 3;
if (ndummy < 0) {
ndummy = 0;
}
@ -82,7 +81,7 @@ int rm_conv_tx(char *input, int in_len, char *output, int out_len) {
k++;
}
j++;
if (j == RATE * K_p) {
if (j == 3 * K_p) {
j = 0;
}
}
@ -99,22 +98,22 @@ int rm_conv_rx(float *input, int in_len, float *output, int out_len) {
int i, j, k;
int d_i, d_j;
float tmp[RATE * NCOLS * NROWS_MAX];
float tmp[3 * NCOLS * NROWS_MAX];
nrows = (int) (out_len / RATE - 1) / NCOLS + 1;
nrows = (int) (out_len / 3 - 1) / NCOLS + 1;
if (nrows > NROWS_MAX) {
fprintf(stderr, "Output too large. Max output length is %d\n",
RATE * NCOLS * NROWS_MAX);
3 * NCOLS * NROWS_MAX);
return -1;
}
K_p = nrows * NCOLS;
ndummy = K_p - out_len / RATE;
ndummy = K_p - out_len / 3;
if (ndummy < 0) {
ndummy = 0;
}
for (i = 0; i < RATE * K_p; i++) {
for (i = 0; i < 3 * K_p; i++) {
tmp[i] = RX_NULL;
}
@ -134,22 +133,22 @@ int rm_conv_rx(float *input, int in_len, float *output, int out_len) {
k++;
}
j++;
if (j == RATE * K_p) {
if (j == 3 * K_p) {
j = 0;
}
}
/* interleaving and bit selection */
for (i = 0; i < out_len / RATE; i++) {
for (i = 0; i < out_len / 3; i++) {
d_i = (i + ndummy) / NCOLS;
d_j = (i + ndummy) % NCOLS;
for (j = 0; j < RATE; j++) {
for (j = 0; j < 3; j++) {
float o = tmp[K_p * j + RM_PERM_TC_INV[d_j] * nrows
+ d_i];
if (o != RX_NULL) {
output[i * RATE + j] = o;
output[i * 3 + j] = o;
} else {
output[i * RATE + j] = 0;
output[i * 3 + j] = 0;
}
}
}
@ -166,11 +165,11 @@ int rm_conv_initialize(rm_conv_hl* h) {
/** This function can be called in a subframe (1ms) basis */
int rm_conv_work(rm_conv_hl* hl) {
if (hl->init.direction) {
//rm_conv_tx(hl->input, hl->output, hl->in_len, hl->ctrl_in.S);
hl->out_len = hl->ctrl_in.S;
} else {
rm_conv_rx(hl->input, hl->output, hl->in_len, hl->ctrl_in.E);
rm_conv_tx(hl->input, hl->in_len, hl->output, hl->ctrl_in.E);
hl->out_len = hl->ctrl_in.E;
} else {
rm_conv_rx(hl->input, hl->in_len, hl->output, hl->ctrl_in.S);
hl->out_len = hl->ctrl_in.S;
}
return 0;
}

40
lte/lib/fec/src/rm_turbo.c
Unescape Escape View File

@ -35,7 +35,6 @@
#define NCOLS 32
#define NROWS_MAX NCOLS
#define RATE 3
unsigned char RM_PERM_TC[NCOLS] =
{ 0, 16, 8, 24, 4, 20, 12, 28, 2, 18, 10, 26, 6, 22, 14, 30, 1, 17, 9,
@ -48,11 +47,6 @@ int rm_turbo_init(rm_turbo_t *q, int buffer_len) {
perror("malloc");
return -1;
}
q->d2_perm = malloc(buffer_len * sizeof(int) / 3 + 1);
if (!q->d2_perm) {
perror("malloc");
return -1;
}
return 0;
}
@ -74,7 +68,7 @@ int rm_turbo_tx(rm_turbo_t *q, char *input, int in_len, char *output, int out_le
int i, j, k, s, kidx, N_cb, k0;
nrows = (int) (in_len / RATE - 1) / NCOLS + 1;
nrows = (int) (in_len / 3 - 1) / NCOLS + 1;
K_p = nrows * NCOLS;
if (3 * K_p > q->buffer_len) {
fprintf(stderr,
@ -83,7 +77,7 @@ int rm_turbo_tx(rm_turbo_t *q, char *input, int in_len, char *output, int out_le
return -1;
}
ndummy = K_p - in_len / RATE;
ndummy = K_p - in_len / 3;
if (ndummy < 0) {
ndummy = 0;
}
@ -148,7 +142,7 @@ int rm_turbo_rx(rm_turbo_t *q, float *input, int in_len, float *output, int out_
float *tmp = (float*) q->buffer;
nrows = (int) (out_len / RATE - 1) / NCOLS + 1;
nrows = (int) (out_len / 3 - 1) / NCOLS + 1;
K_p = nrows * NCOLS;
if (3 * K_p > q->buffer_len) {
fprintf(stderr,
@ -157,12 +151,12 @@ int rm_turbo_rx(rm_turbo_t *q, float *input, int in_len, float *output, int out_
return -1;
}
ndummy = K_p - out_len / RATE;
ndummy = K_p - out_len / 3;
if (ndummy < 0) {
ndummy = 0;
}
for (i = 0; i < RATE * K_p; i++) {
for (i = 0; i < 3 * K_p; i++) {
tmp[i] = RX_NULL;
}
@ -170,15 +164,12 @@ int rm_turbo_rx(rm_turbo_t *q, float *input, int in_len, float *output, int out_
N_cb = 3 * K_p; // TODO: Soft buffer size limitation
k0 = nrows * (2 * (int) ceilf((float) N_cb / (float) (8 * nrows))
* rv_idx + 2);
k = 0;
j = 0;
while (k < in_len) {
jp = (k0 + j) % N_cb;
if (jp == 32 || jp == 95 || jp == 0) {
i=0;
}
if (jp < K_p || !(jp%2)) {
if (jp >= K_p) {
d_i = ((jp-K_p) / 2) / nrows;
@ -195,7 +186,6 @@ int rm_turbo_rx(rm_turbo_t *q, float *input, int in_len, float *output, int out_
} else {
int jpp = (jp-K_p-1)/2;
kidx = (RM_PERM_TC[jpp / nrows] + NCOLS * (jpp % nrows) + 1) % K_p;
q->d2_perm[kidx] = jpp; // save the permutation in a temporary buffer
if ((kidx - ndummy) < 0) {
isdummy = true;
} else {
@ -215,21 +205,23 @@ int rm_turbo_rx(rm_turbo_t *q, float *input, int in_len, float *output, int out_
}
/* interleaving and bit selection */
for (i = 0; i < out_len / RATE; i++) {
for (i = 0; i < out_len / 3; i++) {
d_i = (i + ndummy) / NCOLS;
d_j = (i + ndummy) % NCOLS;
for (j = 0; j < RATE; j++) {
for (j = 0; j < 3; j++) {
if (j != 2) {
kidx = K_p * j + (j+1)*(RM_PERM_TC[d_j] * nrows + d_i);
} else {
// use the saved permuatation function to avoid computing the inverse
kidx = 2*q->d2_perm[(i+ndummy)%K_p]+K_p+1;
k=(i+ndummy-1)%K_p;
if (k<0) k+=K_p;
kidx = (k / NCOLS + nrows * RM_PERM_TC[k % NCOLS]) % K_p;
kidx = 2*kidx+K_p+1;
}
float o = tmp[kidx];
if (o != RX_NULL) {
output[i * RATE + j] = o;
if (tmp[kidx] != RX_NULL) {
output[i * 3 + j] = tmp[kidx];
} else {
output[i * RATE + j] = 0;
output[i * 3 + j] = 0;
}
}
}

5
lte/lib/fec/test/CMakeLists.txt
Unescape Escape View File

@ -32,6 +32,11 @@ TARGET_LINK_LIBRARIES(rm_turbo_test lte)
ADD_TEST(rm_conv_test_1 rm_conv_test -t 480 -r 1920)
ADD_TEST(rm_conv_test_2 rm_conv_test -t 1920 -r 480)
ADD_TEST(rm_turbo_test_1 rm_turbo_test -t 480 -r 1920 -i 0)
ADD_TEST(rm_turbo_test_2 rm_turbo_test -t 1920 -r 480 -i 1)
ADD_TEST(rm_turbo_test_1 rm_turbo_test -t 480 -r 1920 -i 2)
ADD_TEST(rm_turbo_test_2 rm_turbo_test -t 1920 -r 480 -i 3)
########################################################################

14
lte/lib/fec/test/rm_turbo_test.c
Unescape Escape View File

@ -71,6 +71,7 @@ void parse_args(int argc, char **argv) {
}
}
int main(int argc, char **argv) {
int i;
char *bits, *rm_bits;
@ -105,7 +106,7 @@ int main(int argc, char **argv) {
bits[i] = rand()%2;
}
rm_turbo_init(&rm_turbo, 1000);
rm_turbo_init(&rm_turbo, 2000);
rm_turbo_tx(&rm_turbo, bits, nof_tx_bits, rm_bits, nof_rx_bits, rv_idx);
@ -117,9 +118,8 @@ int main(int argc, char **argv) {
nof_errors = 0;
for (i=0;i<nof_tx_bits;i++) {
if ((unrm_symbols[i] > 0) != bits[i]) {
if (unrm_symbols[i] > 0 && ((unrm_symbols[i] > 0) != bits[i])) {
nof_errors++;
printf("%.2f != %d\n", unrm_symbols[i], bits[i]);
}
}
@ -130,11 +130,9 @@ int main(int argc, char **argv) {
free(rm_symbols);
free(unrm_symbols);
if (nof_tx_bits >= nof_rx_bits) {
if (nof_errors) {
printf("nof_errors=%d\n", nof_errors);
exit(-1);
}
if (nof_errors) {
printf("nof_errors=%d\n", nof_errors);
exit(-1);
}
printf("Ok\n");

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