int main(int argc, char **argv) {
int frame_cnt;
float *llr;
unsigned char *llr_c;
char *data_tx, *data_rx, *symbols;
int i, j;
float var[SNR_POINTS];
int snr_points;
float ber[MAX_ITERATIONS][SNR_POINTS];
unsigned int errors[100];
int coded_length;
struct timeval tdata[3];
float mean_usec;
tdec_t tdec;
tcod_t tcod;
parse_args(argc, argv);
if (!seed) {
seed = time(NULL);
}
srand(seed);
if (test_known_data) {
frame_length = KNOWN_DATA_LEN;
} else {
frame_length = lte_cb_size(lte_find_cb_index(frame_length));
}
coded_length = 3 * (frame_length) + TOTALTAIL;
printf(" Frame length: %d\n", frame_length);
if (ebno_db < 100.0) {
printf(" EbNo: %.2f\n", ebno_db);
}
data_tx = malloc(frame_length * sizeof(char));
if (!data_tx) {
perror("malloc");
exit(-1);
}
data_rx = malloc(frame_length * sizeof(char));
if (!data_rx) {
perror("malloc");
exit(-1);
}
symbols = malloc(coded_length * sizeof(char));
if (!symbols) {
perror("malloc");
exit(-1);
}
llr = malloc(coded_length * sizeof(float));
if (!llr) {
perror("malloc");
exit(-1);
}
llr_c = malloc(coded_length * sizeof(char));
if (!llr_c) {
perror("malloc");
exit(-1);
}
if (tcod_init(&tcod, frame_length)) {
fprintf(stderr, "Error initiating Turbo coder\n");
exit(-1);
}
if (tdec_init(&tdec, frame_length)) {
fprintf(stderr, "Error initiating Turbo decoder\n");
exit(-1);
}
float ebno_inc, esno_db;
ebno_inc = (SNR_MAX - SNR_MIN) / SNR_POINTS;
if (ebno_db == 100.0) {
snr_points = SNR_POINTS;
for (i = 0; i < snr_points; i++) {
ebno_db = SNR_MIN + i * ebno_inc;
esno_db = ebno_db + 10 * log10((double) 1 / 3);
var[i] = sqrt(1 / (pow(10, esno_db / 10)));
}
} else {
esno_db = ebno_db + 10 * log10((double) 1 / 3);
var[0] = sqrt(1 / (pow(10, esno_db / 10)));
snr_points = 1;
}
for (i = 0; i < snr_points; i++) {
mean_usec = 0;
frame_cnt = 0;
bzero(errors, sizeof(int) * MAX_ITERATIONS);
while (frame_cnt < nof_frames) {
/* generate data_tx */
for (j = 0; j < frame_length; j++) {
if (test_known_data) {
data_tx[j] = known_data[j];
} else {
data_tx[j] = rand() % 2;
}
}
/* coded BER */
if (test_known_data) {
for (j = 0; j < coded_length; j++) {
symbols[j] = known_data_encoded[j];
}
} else {
tcod_encode(&tcod, data_tx, symbols, frame_length);
}
for (j = 0; j < coded_length; j++) {
llr[j] = symbols[j] ? sqrt(2) : -sqrt(2);
}
ch_awgn_f(llr, llr, var[i], coded_length);
/* decoder */
tdec_reset(&tdec, frame_length);
int t;
if (nof_iterations == -1) {
t = MAX_ITERATIONS;
} else {
t = nof_iterations;
}
for (j = 0; j < t; j++) {
if (!j)
gettimeofday(&tdata[1], NULL); // Only measure 1 iteration
tdec_iteration(&tdec, llr, frame_length);
tdec_decision(&tdec, data_rx, frame_length);
if (!j)
gettimeofday(&tdata[2], NULL);
if (!j)
get_time_interval(tdata);
if (!j)
mean_usec = (float) mean_usec * 0.9 + (float) tdata[0].tv_usec * 0.1;
/* check errors */
errors[j] += bit_diff(data_tx, data_rx, frame_length);
if (j < MAX_ITERATIONS) {
ber[j][i] = (float) errors[j] / (frame_cnt * frame_length);
}
}
frame_cnt++;
printf("Eb/No: %3.2f %10d/%d ",
SNR_MIN + i * ebno_inc, frame_cnt, nof_frames);
printf("BER: %.2e ", (float) errors[j - 1] / (frame_cnt * frame_length));
printf("%3.1f Mbps (%6.2f usec)", (float) frame_length / mean_usec,
mean_usec);
printf("\r");
}
printf("\n");
if (snr_points == 1) {
if (test_known_data && seed == KNOWN_DATA_SEED
&& ebno_db == KNOWN_DATA_EBNO && frame_cnt == KNOWN_DATA_NFRAMES) {
for (j = 0; j < MAX_ITERATIONS; j++) {
if (errors[j] > known_data_errors[j]) {
fprintf(stderr, "Expected %d errors but got %d\n",
known_data_errors[j], errors[j]);
exit(-1);
} else {
printf("Iter %d ok\n", j + 1);
}
}
} else {
for (j = 0; j < MAX_ITERATIONS; j++) {
printf("BER: %g\t%u errors\n",
(float) errors[j] / (frame_cnt * frame_length), errors[j]);
if (test_errors) {
if (errors[j]
> get_expected_errors(frame_cnt, seed, j + 1, frame_length,
ebno_db)) {
fprintf(stderr, "Expected %d errors but got %d\n",
get_expected_errors(frame_cnt, seed, j + 1, frame_length,
ebno_db), errors[j]);
exit(-1);
} else {
printf("Iter %d ok\n", j + 1);
}
}
}
}
}
}
free(data_tx);
free(symbols);
free(llr);
free(llr_c);
free(data_rx);
tdec_free(&tdec);
tcod_free(&tcod);
printf("\n");
output_matlab(ber, snr_points);
printf("Done\n");
exit(0);
}
int main(int argc, char **argv) {
int frame_cnt;
float *llr;
uint8_t *llr_c;
uint8_t *data_tx, *data_rx[NTYPES], *symbols;
int i, j;
float var[SNR_POINTS], varunc[SNR_POINTS];
int snr_points;
float ber[NTYPES][SNR_POINTS];
uint32_t errors[NTYPES];
srslte_viterbi_type_t srslte_viterbi_type[NCODS];
srslte_viterbi_t dec[NCODS];
srslte_convcoder_t cod[NCODS];
int coded_length[NCODS];
int n, ncods, max_coded_length;
parse_args(argc, argv);
if (!seed) {
seed = time(NULL);
}
srand(seed);
switch (K) {
case 9:
cod[0].poly[0] = 0x1ed;
cod[0].poly[1] = 0x19b;
cod[0].poly[2] = 0x127;
cod[0].tail_biting = false;
cod[0].K = 9;
srslte_viterbi_type[0] = SRSLTE_VITERBI_39;
ncods=1;
break;
case 7:
cod[0].poly[0] = 0x6D;
cod[0].poly[1] = 0x4F;
cod[0].poly[2] = 0x57;
cod[0].K = 7;
cod[0].tail_biting = tail_biting;
srslte_viterbi_type[0] = SRSLTE_VITERBI_37;
ncods=1;
break;
default:
cod[0].poly[0] = 0x1ed;
cod[0].poly[1] = 0x19b;
cod[0].poly[2] = 0x127;
cod[0].tail_biting = false;
cod[0].K = 9;
srslte_viterbi_type[0] = SRSLTE_VITERBI_39;
cod[1].poly[0] = 0x6D;
cod[1].poly[1] = 0x4F;
cod[1].poly[2] = 0x57;
cod[1].tail_biting = false;
cod[1].K = 7;
srslte_viterbi_type[1] = SRSLTE_VITERBI_37;
cod[2].poly[0] = 0x6D;
cod[2].poly[1] = 0x4F;
cod[2].poly[2] = 0x57;
cod[2].tail_biting = true;
cod[2].K = 7;
srslte_viterbi_type[2] = SRSLTE_VITERBI_37;
ncods=3;
}
max_coded_length = 0;
for (i=0; i<ncods; i++) {
cod[i].R = 3;
coded_length[i] = cod[i].R * (frame_length + ((cod[i].tail_biting) ? 0 : cod[i].K - 1));
if (coded_length[i] > max_coded_length) {
max_coded_length = coded_length[i];
}
srslte_viterbi_init(&dec[i], srslte_viterbi_type[i], cod[i].poly, frame_length, cod[i].tail_biting);
printf("Convolutional Code 1/3 K=%d Tail bitting: %s\n", cod[i].K, cod[i].tail_biting ? "yes" : "no");
}
printf(" Frame length: %d\n", frame_length);
if (ebno_db < 100.0) {
printf(" EbNo: %.2f\n", ebno_db);
}
data_tx = malloc(frame_length * sizeof(uint8_t));
if (!data_tx) {
perror("malloc");
exit(-1);
}
for (i = 0; i < NTYPES; i++) {
data_rx[i] = malloc(frame_length * sizeof(uint8_t));
if (!data_rx[i]) {
perror("malloc");
exit(-1);
}
}
symbols = malloc(max_coded_length * sizeof(uint8_t));
if (!symbols) {
perror("malloc");
exit(-1);
}
llr = malloc(max_coded_length * sizeof(float));
if (!llr) {
perror("malloc");
exit(-1);
}
llr_c = malloc(2 * max_coded_length * sizeof(uint8_t));
if (!llr_c) {
perror("malloc");
exit(-1);
}
float ebno_inc, esno_db;
ebno_inc = (SNR_MAX - SNR_MIN) / SNR_POINTS;
if (ebno_db == 100.0) {
snr_points = SNR_POINTS;
for (i = 0; i < snr_points; i++) {
ebno_db = SNR_MIN + i * ebno_inc;
esno_db = ebno_db + 10 * log10((double) 1 / 3);
var[i] = sqrt(1 / (pow(10, esno_db / 10)));
varunc[i] = sqrt(1 / (pow(10, ebno_db / 10)));
}
} else {
esno_db = ebno_db + 10 * log10((double) 1 / 3);
var[0] = sqrt(1 / (pow(10, esno_db / 10)));
varunc[0] = sqrt(1 / (pow(10, ebno_db / 10)));
snr_points = 1;
}
float Gain = 32;
for (i = 0; i < snr_points; i++) {
frame_cnt = 0;
for (j = 0; j < NTYPES; j++) {
errors[j] = 0;
}
while (frame_cnt < nof_frames) {
/* generate data_tx */
for (j = 0; j < frame_length; j++) {
data_tx[j] = rand() % 2;
}
/* uncoded BER */
for (j = 0; j < frame_length; j++) {
llr[j] = data_tx[j] ? sqrt(2) : -sqrt(2);
}
srslte_ch_awgn_f(llr, llr, varunc[i], frame_length);
for (j = 0; j < frame_length; j++) {
data_rx[0][j] = llr[j] > 0 ? 1 : 0;
}
/* coded BER */
for (n=0; n<ncods; n++) {
srslte_convcoder_encode(&cod[n], data_tx, symbols, frame_length);
for (j = 0; j < coded_length[n]; j++) {
llr[j] = symbols[j] ? sqrt(2) : -sqrt(2);
}
srslte_ch_awgn_f(llr, llr, var[i], coded_length[n]);
srslte_vec_quant_fuc(llr, llr_c, Gain, 127.5, 255, coded_length[n]);
/* decoder 1 */
srslte_viterbi_decode_uc(&dec[n], llr_c, data_rx[1+n], frame_length);
}
/* check errors */
for (j = 0; j < 1+ncods; j++) {
errors[j] += srslte_bit_diff(data_tx, data_rx[j], frame_length);
}
frame_cnt++;
printf("Eb/No: %3.2f %10d/%d ",
SNR_MIN + i * ebno_inc,frame_cnt,nof_frames);
for (n=0; n<1+ncods; n++) {
printf("BER: %.2e ",(float) errors[n] / (frame_cnt * frame_length));
}
printf("\r");
}
printf("\n");
for (j = 0; j < 1+ncods; j++) {
ber[j][i] = (float) errors[j] / (frame_cnt * frame_length);
}
if (snr_points == 1) {
printf("BER uncoded: %g\t%u errors\n",
(float) errors[0] / (frame_cnt * frame_length), errors[0]);
for (n=0; n<ncods; n++) {
printf("BER K=%d: %g\t%u errors\n",cod[n].K,
(float) errors[1+n] / (frame_cnt * frame_length), errors[1+n]);
}
}
}
for (n=0; n<ncods; n++) {
srslte_viterbi_free(&dec[n]);
}
free(data_tx);
free(symbols);
free(llr);
free(llr_c);
for (i = 0; i < NTYPES; i++) {
free(data_rx[i]);
}
if (snr_points == 1) {
int expected_errors = get_expected_errors(nof_frames,
seed, frame_length, K, tail_biting, ebno_db);
if (expected_errors == -1) {
fprintf(stderr, "Test parameters not defined in test_results.h\n");
exit(-1);
} else {
printf("errors =%d, expected =%d\n", errors[1], expected_errors);
exit(errors[1] > expected_errors);
}
} else {
printf("\n");
output_matlab(ber, snr_points, cod, ncods);
printf("Done\n");
exit(0);
}
}
