mirror of https://github.com/PentHertz/srsLTE.git
Scrambling using words for XOR
This commit is contained in:
parent
76c432f777
commit
ea40092db7
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@ -31,6 +31,7 @@
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#include <assert.h>
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#include <assert.h>
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#include "srslte/common/sequence.h"
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#include "srslte/common/sequence.h"
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#include "srslte/utils/vector.h"
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#define Nc 1600
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#define Nc 1600
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@ -88,7 +89,7 @@ int srslte_sequence_init(srslte_sequence_t *q, uint32_t len) {
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free(q->c);
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free(q->c);
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}
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}
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if (!q->c) {
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if (!q->c) {
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q->c = malloc(len * sizeof(uint8_t));
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q->c = srslte_vec_malloc(len * sizeof(uint8_t));
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if (!q->c) {
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if (!q->c) {
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return SRSLTE_ERROR;
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return SRSLTE_ERROR;
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}
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}
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@ -29,6 +29,7 @@
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#include <stdlib.h>
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#include <stdlib.h>
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#include <string.h>
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#include <string.h>
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#include <assert.h>
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#include <assert.h>
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#include "srslte/utils/vector.h"
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#include "srslte/scrambling/scrambling.h"
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#include "srslte/scrambling/scrambling.h"
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void srslte_scrambling_f(srslte_sequence_t *s, float *data) {
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void srslte_scrambling_f(srslte_sequence_t *s, float *data) {
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@ -40,7 +41,7 @@ void srslte_scrambling_f_offset(srslte_sequence_t *s, float *data, int offset, i
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assert (len + offset <= s->len);
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assert (len + offset <= s->len);
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for (i = 0; i < len; i++) {
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for (i = 0; i < len; i++) {
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data[i] = data[i] * (1 - 2 * s->c[i + offset]);
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data[i] = data[i] * (1-2*s->c[i + offset]);
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}
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}
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}
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}
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@ -58,18 +59,35 @@ void srslte_scrambling_c_offset(srslte_sequence_t *s, cf_t *data, int offset, in
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}
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}
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void srslte_scrambling_b(srslte_sequence_t *s, uint8_t *data) {
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void srslte_scrambling_b(srslte_sequence_t *s, uint8_t *data) {
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int i;
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srslte_scrambling_b_offset(s, data, 0, s->len);
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for (i = 0; i < s->len; i++) {
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data[i] = (data[i] + s->c[i]) % 2;
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}
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}
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}
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void srslte_scrambling_b_offset(srslte_sequence_t *s, uint8_t *data, int offset, int len) {
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void srslte_scrambling_b_offset(srslte_sequence_t *s, uint8_t *data, int offset, int len) {
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int i;
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int i;
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assert (len + offset <= s->len);
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assert (len + offset <= s->len);
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for (i = 0; i < len; i++) {
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// Do XOR on a word basis
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data[i] = (data[i] + s->c[i + offset]) % 2;
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if (!(len%8)) {
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uint64_t *x = (uint64_t*) data;
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uint64_t *y = (uint64_t*) &s->c[offset];
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for (int i=0;i<len/8;i++) {
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x[i] = (x[i] ^ y[i]);
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}
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} else if (!(len%4)) {
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uint32_t *x = (uint32_t*) data;
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uint32_t *y = (uint32_t*) &s->c[offset];
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for (int i=0;i<len/8;i++) {
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x[i] = (x[i] ^ y[i]);
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}
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} else if (!(len%2)) {
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uint16_t *x = (uint16_t*) data;
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uint16_t *y = (uint16_t*) &s->c[offset];
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for (int i=0;i<len/8;i++) {
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x[i] = (x[i] ^ y[i]);
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}
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} else {
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for (i = 0; i < len; i++) {
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data[i] = (data[i] + s->c[i + offset]) % 2;
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}
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}
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}
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}
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}
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@ -40,20 +40,25 @@ char *srslte_sequence_name = NULL;
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bool do_floats = false;
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bool do_floats = false;
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srslte_cp_t cp = SRSLTE_CP_NORM;
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srslte_cp_t cp = SRSLTE_CP_NORM;
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int cell_id = -1;
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int cell_id = -1;
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int nof_bits = 100;
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void usage(char *prog) {
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void usage(char *prog) {
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printf("Usage: %s [ef] -c cell_id -s [PBCH, PDSCH, PDCCH, PMCH, PUCCH]\n", prog);
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printf("Usage: %s [ef] -c cell_id -s [PBCH, PDSCH, PDCCH, PMCH, PUCCH]\n", prog);
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printf("\t -l nof_bits [Default %d]\n", nof_bits);
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printf("\t -e CP extended [Default CP Normal]\n");
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printf("\t -e CP extended [Default CP Normal]\n");
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printf("\t -f scramble floats [Default bits]\n");
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printf("\t -f scramble floats [Default bits]\n");
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}
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}
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void parse_args(int argc, char **argv) {
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void parse_args(int argc, char **argv) {
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int opt;
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int opt;
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while ((opt = getopt(argc, argv, "csef")) != -1) {
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while ((opt = getopt(argc, argv, "csefl")) != -1) {
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switch (opt) {
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switch (opt) {
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case 'c':
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case 'c':
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cell_id = atoi(argv[optind]);
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cell_id = atoi(argv[optind]);
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break;
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break;
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case 'l':
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nof_bits = atoi(argv[optind]);
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break;
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case 'e':
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case 'e':
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cp = SRSLTE_CP_EXT;
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cp = SRSLTE_CP_EXT;
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break;
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break;
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@ -81,6 +86,8 @@ void parse_args(int argc, char **argv) {
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int init_sequence(srslte_sequence_t *seq, char *name) {
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int init_sequence(srslte_sequence_t *seq, char *name) {
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if (!strcmp(name, "PBCH")) {
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if (!strcmp(name, "PBCH")) {
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return srslte_sequence_pbch(seq, cp, cell_id);
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return srslte_sequence_pbch(seq, cp, cell_id);
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} else if (!strcmp(name, "PDSCH")) {
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return srslte_sequence_pdsch(seq, 1234, 0, 0, cell_id, nof_bits);
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} else {
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} else {
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fprintf(stderr, "Unsupported sequence name %s\n", name);
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fprintf(stderr, "Unsupported sequence name %s\n", name);
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return -1;
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return -1;
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@ -93,6 +100,7 @@ int main(int argc, char **argv) {
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srslte_sequence_t seq;
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srslte_sequence_t seq;
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uint8_t *input_b, *scrambled_b;
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uint8_t *input_b, *scrambled_b;
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float *input_f, *scrambled_f;
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float *input_f, *scrambled_f;
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struct timeval t[3];
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parse_args(argc, argv);
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parse_args(argc, argv);
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@ -118,9 +126,14 @@ int main(int argc, char **argv) {
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scrambled_b[i] = input_b[i];
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scrambled_b[i] = input_b[i];
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}
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}
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gettimeofday(&t[1], NULL);
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srslte_scrambling_b(&seq, scrambled_b);
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srslte_scrambling_b(&seq, scrambled_b);
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gettimeofday(&t[2], NULL);
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srslte_scrambling_b(&seq, scrambled_b);
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srslte_scrambling_b(&seq, scrambled_b);
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get_time_interval(t);
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printf("Texec=%d us for %d bits\n", t[0].tv_usec, seq.len);
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for (i=0;i<seq.len;i++) {
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for (i=0;i<seq.len;i++) {
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if (scrambled_b[i] != input_b[i]) {
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if (scrambled_b[i] != input_b[i]) {
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printf("Error in %d\n", i);
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printf("Error in %d\n", i);
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@ -146,9 +159,14 @@ int main(int argc, char **argv) {
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scrambled_f[i] = input_f[i];
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scrambled_f[i] = input_f[i];
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}
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}
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gettimeofday(&t[1], NULL);
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srslte_scrambling_f(&seq, scrambled_f);
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srslte_scrambling_f(&seq, scrambled_f);
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gettimeofday(&t[2], NULL);
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srslte_scrambling_f(&seq, scrambled_f);
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srslte_scrambling_f(&seq, scrambled_f);
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get_time_interval(t);
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printf("Texec=%d us for %d bits\n", t[0].tv_usec, seq.len);
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for (i=0;i<seq.len;i++) {
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for (i=0;i<seq.len;i++) {
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if (scrambled_f[i] != input_f[i]) {
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if (scrambled_f[i] != input_f[i]) {
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printf("Error in %d\n", i);
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printf("Error in %d\n", i);
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