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Commit e5f9246c authored by letr's avatar letr Committed by Florian Kaltenberger
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encoder with rate matching

parent f0e7c3da
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openair1/PHY/CODING/TESTBENCH/Gen_shift_value.h
View file @ e5f9246c
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openair1/PHY/CODING/TESTBENCH/ldpctest.c
View file @ e5f9246c
......@@ -27,6 +27,8 @@
#include "SIMULATION/TOOLS/defs.h"
#include "Gen_shift_value.h"
#include "choose_generator_matrix.h"
#include "ldpc_encoder_header.h"
// 4-bit quantizer
char quantize4bit(double D,double x)
......@@ -70,7 +72,7 @@ int test_ldpc(short No_iteration,
double rate,
double SNR,
unsigned char qbits,
unsigned int block_length,
short block_length,
unsigned int ntrials,
unsigned int *errors,
unsigned int *crc_misses)
......@@ -81,8 +83,9 @@ int test_ldpc(short No_iteration,
opp_enabled=1;
cpu_freq_GHz = get_cpu_freq_GHz();
short test_input[block_length];
short *c; //padded codeword
//short test_input[block_length];
short *test_input;
//short *c; //padded codeword
short *esimated_output;
short *channel_input;
double *channel_output;
......@@ -90,230 +93,130 @@ int test_ldpc(short No_iteration,
short *channel_output_fixed;
unsigned int i,trial=0;
short *Gen_shift_values, *no_shift_values, *pointer_shift_values;
short BG,Zc,Kb,nrows,ncols;
int i1,i2,i3,i4,i5,i6,t,temp,k;
/*
short BG,Zc,Kb,nrows,ncols,channel_temp;
int no_punctured_columns; //new
//Table of possible lifting sizes
short lift_size[51]={2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,18,20,22,24,26,28,30,32,36,40,44,48,52,56,60,64,72,80,88,96,104,112,120,128,144,160,176,192,208,224,240,256,288,320,352,384};
*/
*errors=0;
*crc_misses=0;
while (trial++ < ntrials) {
while (trial++ < ntrials)
{
// generate input block
test_input=(short*)malloc(sizeof(short) * block_length);
for (i=0; i<block_length; i++)
{
test_input[i]=rand()%2;
//test_input[i]=i%2;
}
// generate input block
for (i=0; i<block_length; i++) {
//test_input[i] = (unsigned char)(taus()&0xff);
test_input[i]=rand()%2;
//test_input[i]=i%2;
}
start_meas(&time);
//determine number of bits in codeword
if (block_length>3840)
{
BG=1;
Kb = 22;
nrows=46;
ncols=22;
}
/*
//determine number of bits in codeword
if (block_length>3840)
{
BG=1;
Kb = 22;
nrows=46; //parity check bits
ncols=22; //info bits
}
else if (block_length<=3840)
{
BG=2;
nrows=42;
ncols=10;
if (block_length>640)
{
BG=2;
nrows=42; //parity check bits
ncols=10; // info bits
if (block_length>640)
Kb = 10;
else if (block_length>560)
else if (block_length>560)
Kb = 9;
else if (block_length>192)
else if (block_length>192)
Kb = 8;
else
else
Kb = 6;
}
}
//find minimum value in all sets of lifting size
//find minimum value in all sets of lifting size
for (i1=0; i1 < 51; i1++)
{
if (lift_size[i1] >= (double) block_length/Kb)
{
Zc = lift_size[i1];
// printf("%d\n",Zc);
break;
}
}
// load base graph of generator matrix
if (BG==1)
{
no_shift_values=(short*) no_shift_values_BG1;
pointer_shift_values=(short*) pointer_shift_values_BG1;
if (Zc==2||Zc==4||Zc==8||Zc==16||Zc==32||Zc==64||Zc==128||Zc==256)
Gen_shift_values=(short*) Gen_shift_values_BG1_a_2;
// else if (Zc==3||Zc==6||Zc==12||Zc==24||Zc==48||Zc==96||Zc==192||Zc==384)
//Gen_shift_values=(short*) Gen_shift_values_BG1_a_3;
else if (Zc==384)
Gen_shift_values=(short*) Gen_shift_values_BG1_Z_384;
else if (Zc==5||Zc==10||Zc==20||Zc==40||Zc==80||Zc==160||Zc==320)
Gen_shift_values=(short*) Gen_shift_values_BG1_a_5;
else if (Zc==7||Zc==14||Zc==28||Zc==56||Zc==112||Zc==224)
Gen_shift_values=(short*) Gen_shift_values_BG1_a_7;
else if (Zc==9||Zc==18||Zc==36||Zc==72||Zc==144||Zc==288)
Gen_shift_values=(short*) Gen_shift_values_BG1_a_9;
else if (Zc==11||Zc==22||Zc==44||Zc==88||Zc==176||Zc==352)
Gen_shift_values=(short*) Gen_shift_values_BG1_a_11;
else if (Zc==13||Zc==26||Zc==52||Zc==104||Zc==208)
Gen_shift_values=(short*) Gen_shift_values_BG1_a_13;
else if (Zc==15||Zc==30||Zc==60||Zc==120||Zc==240)
Gen_shift_values=(short*) Gen_shift_values_BG1_a_15;
}
else if (BG==2)
{
no_shift_values=(short*) no_shift_values_BG2;
pointer_shift_values=(short*) pointer_shift_values_BG2;
//if (Zc==2||Zc==4||Zc==8||Zc==16||Zc==32||Zc==64||Zc==128||Zc==256)
// Gen_shift_values=(short*) Gen_shift_values_BG2_a_2;
if (Zc==128)
Gen_shift_values=(short*) Gen_shift_values_BG2_Z_128;
else if (Zc==3||Zc==6||Zc==12||Zc==24||Zc==48||Zc==96||Zc==192||Zc==384)
Gen_shift_values=(short*) Gen_shift_values_BG2_a_3;
else if (Zc==5||Zc==10||Zc==20||Zc==40||Zc==80||Zc==160||Zc==320)
Gen_shift_values=(short*) Gen_shift_values_BG2_a_5;
else if (Zc==7||Zc==14||Zc==28||Zc==56||Zc==112||Zc==224)
Gen_shift_values=(short*) Gen_shift_values_BG2_a_7;
else if (Zc==9||Zc==18||Zc==36||Zc==72||Zc==144||Zc==288)
Gen_shift_values=(short*) Gen_shift_values_BG2_a_9;
else if (Zc==11||Zc==22||Zc==44||Zc==88||Zc==176||Zc==352)
Gen_shift_values=(short*) Gen_shift_values_BG2_a_11;
else if (Zc==13||Zc==26||Zc==52||Zc==104||Zc==208)
Gen_shift_values=(short*) Gen_shift_values_BG2_a_13;
else if (Zc==15||Zc==30||Zc==60||Zc==120||Zc==240)
Gen_shift_values=(short*) Gen_shift_values_BG2_a_15;
}
c=(short *)malloc(sizeof(short) * Kb * Zc);
channel_input = (short *)malloc( (Kb+nrows) * Zc *sizeof(short));
//padded input sequence
memset(c,0,sizeof(short) * Kb * Zc);
memcpy(c,test_input,block_length * sizeof(short));
//start_meas(&time);
//encode the input sequence
memset(channel_input,0,(Kb+nrows) * Zc*sizeof(short));
// parity check part
{
if (lift_size[i1] >= (double) block_length/Kb)
{
Zc = lift_size[i1];
// printf("%d\n",Zc);
break;
}
}
no_punctured_columns=(int)((nrows+Kb-2)*Zc-block_length/rate)/Zc;
//printf("%d\n",no_punctured_columns);
*/
start_meas(&time);
//// encoder
for (i2=0; i2 < Zc; i2++)
{
t=Kb*Zc+i2;
//rotate matrix here
for (i5=0; i5 < Kb; i5++)
{
temp = c[i5*Zc];
memmove(&c[i5*Zc], &c[i5*Zc+1], (Zc-1)*sizeof(short));
c[i5*Zc+Zc-1] = temp;
//for (i6 = 0; i6 < Zc-1; i6++)
//for (i6 = i5*Zc; i6 < i5*Zc + Zc-1; i6++)
//{
//c[i5*Zc+i6] = c[i5*Zc+i6+1];
//c[i6] = c[i6+1];
//}
//c[i5*Zc+i6] = temp;
//c[i6] = temp;
}
for (i1=0; i1 < nrows; i1++)
{
for (i3=0; i3 < Kb; i3++)
{
for (i4=0; i4 < no_shift_values[i1 * ncols + i3]; i4++)
{
channel_input[t+i1*Zc] = channel_input[t+i1*Zc] + c[ i3*Zc + Gen_shift_values[ pointer_shift_values[i1 * ncols + i3]+i4 ] ];
}
}
channel_input[t+i1*Zc]=channel_input[t+i1*Zc]&1;
}
/*
for (i1=0; i1 < nrows; i1++)
{
k=i1*Zc;
for (i3=0; i3 < Kb; i3++)
{
for (i4=0; i4 < no_shift_values[i1 * ncols + i3]; i4++)
{
channel_input[t+k] = channel_input[t+k] + c[ i3*Zc + Gen_shift_values[ i4] ];
}
}
channel_input[t+k]=channel_input[t+k]&1;
}
*/
}
//stop_meas(&time);
// information part
memcpy(channel_input,c,Kb*Zc*sizeof(short));
stop_meas(&time);
print_meas_now(&time, "", stdout);
//for (i=(Kb+nrows) * Zc-10;i<(Kb+nrows) * Zc;i++)
// printf("channel_input[%d]=%d\n",i,channel_input[i]);
//channel
modulated_input = (double *)malloc( (Kb+nrows) * Zc*sizeof(double));
//channel_output = (short *)malloc( (Kb+nrows) * Zc*sizeof(short));
channel_output = (double *)malloc( (Kb+nrows) * Zc*sizeof(double));
channel_output_fixed = (short *)malloc( (Kb+nrows) * Zc*sizeof(short));
memset(channel_output_fixed,0,(Kb+nrows) * Zc*sizeof(short));
for (i = 2*Zc; i < (Kb+nrows) * Zc; i++) {
#ifdef DEBUG_CODER
if ((i&0xf)==0)
printf("\ne %d..%d: ",i,i+15);
#endif
//channel_output[i] = (short)quantize(sigma/4.0,(2.0*channel_input[i]) - 1.0 + sigma*gaussdouble(0.0,1.0),qbits);
if (channel_input[i]==0)
modulated_input[i]=1/sqrt(2); //QPSK
else
modulated_input[i]=-1/sqrt(2);
channel_output[i] = modulated_input[i] + gaussdouble(0.0,1.0) * 1/sqrt(2*SNR);
channel_output_fixed[i] = (short) ((channel_output[i]*128)<0?(channel_output[i]*128-0.5):(channel_output[i]*128+0.5)); //fixed point 9-7
//printf("%lf %d\n",channel_output[i], channel_output_fixed[i]);
//printf("v[%d]=%lf\n",i,modulated_input[i]);
}
channel_input=ldpc_encoder_header(test_input, block_length,rate);
stop_meas(&time);
print_meas_now(&time, "", stdout);
//for (i=0;i<10;i++)
//printf("channel_input[%d]=%d test_input[%d]=%d\n",i,channel_input[i],i,test_input[i]);
/*
//channel
modulated_input = (double *)malloc( (Kb+nrows) * Zc*sizeof(double));
channel_output = (double *)malloc( (Kb+nrows) * Zc*sizeof(double));
channel_output_fixed = (short *)malloc( (Kb+nrows) * Zc*sizeof(short));
memset(channel_output_fixed,0,(Kb+nrows) * Zc*sizeof(short));
for (i = 2*Zc; i < (Kb+nrows) * Zc; i++)
{
#ifdef DEBUG_CODER
if ((i&0xf)==0)
printf("\ne %d..%d: ",i,i+15);
#endif
if (channel_input[i]==0)
modulated_input[i]=1/sqrt(2); //QPSK
else
modulated_input[i]=-1/sqrt(2);
channel_output[i] = modulated_input[i] + gaussdouble(0.0,1.0) * 1/sqrt(2*SNR);
channel_output_fixed[i] = (short) ((channel_output[i]*128)<0?(channel_output[i]*128-0.5):(channel_output[i]*128+0.5)); //fixed point 9-7
}
//for (i=(Kb+nrows) * Zc-5;i<(Kb+nrows) * Zc;i++)
//{
// printf("channel_input[%d]=%d\n",i,channel_input[i]);
//printf("%lf %d\n",channel_output[i], channel_output_fixed[i]);
//printf("v[%d]=%lf\n",i,modulated_input[i]);}
#ifdef DEBUG_CODER
printf("\n");
exit(-1);
#endif
/*
esimated_output=ldpc_decoder(channel_output_fixed, block_length, No_iteration, rate);
//for (i=(Kb+nrows) * Zc-5;i<(Kb+nrows) * Zc;i++)
// printf("esimated_output[%d]=%d\n",i,esimated_output[i]);
for (i=0;i<(Kb+nrows) * Zc;i++) {
// decode the sequence
esimated_output=ldpc_decoder(channel_output_fixed, block_length, No_iteration, rate);
if (esimated_output[i] != channel_input[i]) {
*errors = (*errors) + 1;
break;
}
}
//for (i=(Kb+nrows) * Zc-5;i<(Kb+nrows) * Zc;i++)
// printf("esimated_output[%d]=%d\n",i,esimated_output[i]);
//count errors
for (i=0;i<(Kb+nrows) * Zc;i++)
{
if (esimated_output[i] != channel_input[i])
{
*errors = (*errors) + 1;
break;
}
}
free(channel_input);
free(modulated_input);
free(channel_output);
free(channel_output_fixed);
*/
free(c);
free(channel_input);
free(modulated_input);
free(channel_output);
free(channel_output_fixed);
}
//printf("%d\n",*errors);
}
return *errors;
......@@ -326,49 +229,28 @@ int main(int argc, char *argv[])
{
unsigned int errors,crc_misses;
unsigned int block_length=22*384;
short block_length=22*384;
short No_iteration=25;
double rate=0.2;
double rate=0.667;
double SNR,SNR_lin;
unsigned char qbits;
//time_stats_t time;
unsigned char qbits;
int i=0;
//opp_enabled=1;
// cpu_freq_GHz = get_cpu_freq_GHz();
randominit(0);
//logInit();
randominit(0);
if (argc>1)
qbits = atoi(argv[1]);
else
qbits = 4;
//printf("Quantization bits %d\n",qbits);
qbits = 4;
unsigned int decoded_errors[100]; // initiate the size of matrix equivalent to
// size of SNR
for (SNR=-2.1; SNR<-2; SNR+=.1) {
SNR_lin = pow(10,SNR/10);
/*
ret = test_ldpc(coded_bits,
sigma, // noise standard deviation
qbits,
block_length, // block length bytes
NTRIALS,
&errors,
&trials,
&uerrors,
&crc_misses,
&iterations);
*/
unsigned int decoded_errors[100]; // initiate the size of matrix equivalent to size of SNR
for (SNR=-2.1; SNR<-2; SNR+=.1)
{
// start_meas(&time);
decoded_errors[i]=test_ldpc(No_iteration,
SNR_lin = pow(10,SNR/10);
decoded_errors[i]=test_ldpc(No_iteration,
rate,
SNR_lin, // noise standard deviation
qbits,
......@@ -376,17 +258,14 @@ int main(int argc, char *argv[])
NTRIALS,
&errors,
&crc_misses);
// stop_meas(&time);
//print_meas_now(&time, "", stdout);
printf("SNR %f, BLER %f (%d/%d)\n",SNR,(float)decoded_errors[i]/(float)NTRIALS,decoded_errors[i],NTRIALS);
printf("SNR %f, BLER %f (%d/%d)\n",SNR,(float)decoded_errors[i]/(float)NTRIALS,decoded_errors[i],NTRIALS);
i=i+1;
}
i=i+1;
}
return(0);
}
openair1/PHY/CODING/TESTBENCH/ldpctest.c~
View file @ e5f9246c
......@@ -27,6 +27,8 @@
#include "SIMULATION/TOOLS/defs.h"
#include "Gen_shift_value.h"
#include "choose_generator_matrix.h"
#include "ldpc_encoder_header.h"
// 4-bit quantizer
char quantize4bit(double D,double x)
......@@ -70,7 +72,7 @@ int test_ldpc(short No_iteration,
double rate,
double SNR,
unsigned char qbits,
unsigned int block_length,
short block_length,
unsigned int ntrials,
unsigned int *errors,
unsigned int *crc_misses)
......@@ -81,8 +83,9 @@ int test_ldpc(short No_iteration,
opp_enabled=1;
cpu_freq_GHz = get_cpu_freq_GHz();
short test_input[block_length];
short *c; //padded codeword
//short test_input[block_length];
short *test_input;
//short *c; //padded codeword
short *esimated_output;
short *channel_input;
double *channel_output;
......@@ -90,228 +93,132 @@ int test_ldpc(short No_iteration,
short *channel_output_fixed;
unsigned int i,trial=0;
/*
short *Gen_shift_values, *no_shift_values, *pointer_shift_values;
short BG,Zc,Kb,nrows,ncols;
int i1,i2,i3,i4,i5,i6,t,temp,k;
short BG,Zc,Kb,nrows,ncols,channel_temp;
int i1,i2,i3,i4,i5,i6,t,temp,temp_prime,k;
int no_punctured_columns; //new
//Table of possible lifting sizes
short lift_size[51]={2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,18,20,22,24,26,28,30,32,36,40,44,48,52,56,60,64,72,80,88,96,104,112,120,128,144,160,176,192,208,224,240,256,288,320,352,384};
*/
*errors=0;
*crc_misses=0;
while (trial++ < ntrials) {
while (trial++ < ntrials)
{
// generate input block
test_input=(short*)malloc(sizeof(short) * block_length);
for (i=0; i<block_length; i++)
{
test_input[i]=rand()%2;
//test_input[i]=i%2;
}
// generate input block
for (i=0; i<block_length; i++) {
//test_input[i] = (unsigned char)(taus()&0xff);
test_input[i]=rand()%2;
//test_input[i]=i%2;
}
start_meas(&time);
//determine number of bits in codeword
if (block_length>3840)
{
BG=1;
Kb = 22;
nrows=46;
ncols=22;
}
/*
//determine number of bits in codeword
if (block_length>3840)
{
BG=1;
Kb = 22;
nrows=46; //parity check bits
ncols=22; //info bits
}
else if (block_length<=3840)
{
BG=2;
nrows=42;
ncols=10;
if (block_length>640)
{
BG=2;
nrows=42; //parity check bits
ncols=10; // info bits
if (block_length>640)
Kb = 10;
else if (block_length>560)
else if (block_length>560)
Kb = 9;
else if (block_length>192)
else if (block_length>192)
Kb = 8;
else
else
Kb = 6;
}
}
//find minimum value in all sets of lifting size
//find minimum value in all sets of lifting size
for (i1=0; i1 < 51; i1++)
{
if (lift_size[i1] >= (double) block_length/Kb)
{
Zc = lift_size[i1];
// printf("%d\n",Zc);
break;
}
}
// load base graph of generator matrix
if (BG==1)
{
no_shift_values=(short*) no_shift_values_BG1;
pointer_shift_values=(short*) pointer_shift_values_BG1;
if (Zc==2||Zc==4||Zc==8||Zc==16||Zc==32||Zc==64||Zc==128||Zc==256)
Gen_shift_values=(short*) Gen_shift_values_BG1_a_2;
// else if (Zc==3||Zc==6||Zc==12||Zc==24||Zc==48||Zc==96||Zc==192||Zc==384)
//Gen_shift_values=(short*) Gen_shift_values_BG1_a_3;
else if (Zc==384)
Gen_shift_values=(short*) Gen_shift_values_BG1_Z_384;
else if (Zc==5||Zc==10||Zc==20||Zc==40||Zc==80||Zc==160||Zc==320)
Gen_shift_values=(short*) Gen_shift_values_BG1_a_5;
else if (Zc==7||Zc==14||Zc==28||Zc==56||Zc==112||Zc==224)
Gen_shift_values=(short*) Gen_shift_values_BG1_a_7;
else if (Zc==9||Zc==18||Zc==36||Zc==72||Zc==144||Zc==288)
Gen_shift_values=(short*) Gen_shift_values_BG1_a_9;
else if (Zc==11||Zc==22||Zc==44||Zc==88||Zc==176||Zc==352)
Gen_shift_values=(short*) Gen_shift_values_BG1_a_11;
else if (Zc==13||Zc==26||Zc==52||Zc==104||Zc==208)
Gen_shift_values=(short*) Gen_shift_values_BG1_a_13;
else if (Zc==15||Zc==30||Zc==60||Zc==120||Zc==240)
Gen_shift_values=(short*) Gen_shift_values_BG1_a_15;
}
else if (BG==2)
{
no_shift_values=(short*) no_shift_values_BG2;
pointer_shift_values=(short*) pointer_shift_values_BG2;
//if (Zc==2||Zc==4||Zc==8||Zc==16||Zc==32||Zc==64||Zc==128||Zc==256)
// Gen_shift_values=(short*) Gen_shift_values_BG2_a_2;
if (Zc==128)
Gen_shift_values=(short*) Gen_shift_values_BG2_Z_128;
else if (Zc==3||Zc==6||Zc==12||Zc==24||Zc==48||Zc==96||Zc==192||Zc==384)
Gen_shift_values=(short*) Gen_shift_values_BG2_a_3;
else if (Zc==5||Zc==10||Zc==20||Zc==40||Zc==80||Zc==160||Zc==320)
Gen_shift_values=(short*) Gen_shift_values_BG2_a_5;
else if (Zc==7||Zc==14||Zc==28||Zc==56||Zc==112||Zc==224)
Gen_shift_values=(short*) Gen_shift_values_BG2_a_7;
else if (Zc==9||Zc==18||Zc==36||Zc==72||Zc==144||Zc==288)
Gen_shift_values=(short*) Gen_shift_values_BG2_a_9;
else if (Zc==11||Zc==22||Zc==44||Zc==88||Zc==176||Zc==352)
Gen_shift_values=(short*) Gen_shift_values_BG2_a_11;
else if (Zc==13||Zc==26||Zc==52||Zc==104||Zc==208)
Gen_shift_values=(short*) Gen_shift_values_BG2_a_13;
else if (Zc==15||Zc==30||Zc==60||Zc==120||Zc==240)
Gen_shift_values=(short*) Gen_shift_values_BG2_a_15;
}
c=(short *)malloc(sizeof(short) * Kb * Zc);
channel_input = (short *)malloc( (Kb+nrows) * Zc *sizeof(short));
//padded input sequence
memset(c,0,sizeof(short) * Kb * Zc);
memcpy(c,test_input,block_length * sizeof(short));
//start_meas(&time);
//encode the input sequence
memset(channel_input,0,(Kb+nrows) * Zc*sizeof(short));
// parity check part
{
if (lift_size[i1] >= (double) block_length/Kb)
{
Zc = lift_size[i1];
// printf("%d\n",Zc);
break;
}
}
no_punctured_columns=(int)((nrows+Kb-2)*Zc-block_length/rate)/Zc;
//printf("%d\n",no_punctured_columns);
*/
start_meas(&time);
//// encoder
for (i2=0; i2 < Zc; i2++)
{
t=Kb*Zc+i2;
//rotate matrix here
for (i5=0; i5 < Kb; i5++)
{
temp = c[i5*Zc];
memmove(&c[i5*Zc], &c[i5*Zc+1], (Zc-1)*sizeof(short));
c[i5*Zc+Zc-1] = temp;
//for (i6 = 0; i6 < Zc-1; i6++)
//for (i6 = i5*Zc; i6 < i5*Zc + Zc-1; i6++)
//{
//c[i5*Zc+i6] = c[i5*Zc+i6+1];
//c[i6] = c[i6+1];
//}
//c[i5*Zc+i6] = temp;
//c[i6] = temp;
}
/*
for (i1=0; i1 < nrows; i1++)
{
for (i3=0; i3 < Kb; i3++)
{
for (i4=0; i4 < no_shift_values[i1 * ncols + i3]; i4++)
{
channel_input[t+i1*Zc] = channel_input[t+i1*Zc] + c[ i3*Zc + Gen_shift_values[ pointer_shift_values[i1 * ncols + i3]+i4 ] ];
}
}
channel_input[t+i1*Zc]=channel_input[t+i1*Zc]&1;
}
*/
for (i1=0; i1 < nrows; i1++)
{
k=i1*Zc;
for (i3=0; i3 < Kb; i3++)
{
for (i4=0; i4 < no_shift_values[i1 * ncols + i3]; i4++)
{
channel_input[t+k] = channel_input[t+k] + c[ i3*Zc + Gen_shift_values[ i4] ];
}
}
channel_input[t+k]=channel_input[t+k]&1;
}
}
//stop_meas(&time);
// information part
memcpy(channel_input,c,Kb*Zc*sizeof(short));
stop_meas(&time);
print_meas_now(&time, "", stdout);
//for (i=(Kb+nrows) * Zc-10;i<(Kb+nrows) * Zc;i++)
// printf("channel_input[%d]=%d\n",i,channel_input[i]);
//channel
modulated_input = (double *)malloc( (Kb+nrows) * Zc*sizeof(double));
//channel_output = (short *)malloc( (Kb+nrows) * Zc*sizeof(short));
channel_output = (double *)malloc( (Kb+nrows) * Zc*sizeof(double));
channel_output_fixed = (short *)malloc( (Kb+nrows) * Zc*sizeof(short));
memset(channel_output_fixed,0,(Kb+nrows) * Zc*sizeof(short));
for (i = 2*Zc; i < (Kb+nrows) * Zc; i++) {
#ifdef DEBUG_CODER
if ((i&0xf)==0)
printf("\ne %d..%d: ",i,i+15);
#endif
//channel_output[i] = (short)quantize(sigma/4.0,(2.0*channel_input[i]) - 1.0 + sigma*gaussdouble(0.0,1.0),qbits);
if (channel_input[i]==0)
modulated_input[i]=1/sqrt(2); //QPSK
else
modulated_input[i]=-1/sqrt(2);
channel_output[i] = modulated_input[i] + gaussdouble(0.0,1.0) * 1/sqrt(2*SNR);
channel_output_fixed[i] = (short) ((channel_output[i]*128)<0?(channel_output[i]*128-0.5):(channel_output[i]*128+0.5)); //fixed point 9-7
//printf("%lf %d\n",channel_output[i], channel_output_fixed[i]);
//printf("v[%d]=%lf\n",i,modulated_input[i]);
}
channel_input=ldpc_encoder_header(test_input, block_length,rate);
stop_meas(&time);
print_meas_now(&time, "", stdout);
//for (i=0;i<10;i++)
//printf("channel_input[%d]=%d test_input[%d]=%d\n",i,channel_input[i],i,test_input[i]);
/*
//channel
modulated_input = (double *)malloc( (Kb+nrows) * Zc*sizeof(double));
channel_output = (double *)malloc( (Kb+nrows) * Zc*sizeof(double));
channel_output_fixed = (short *)malloc( (Kb+nrows) * Zc*sizeof(short));
memset(channel_output_fixed,0,(Kb+nrows) * Zc*sizeof(short));
for (i = 2*Zc; i < (Kb+nrows) * Zc; i++)
{
#ifdef DEBUG_CODER
if ((i&0xf)==0)
printf("\ne %d..%d: ",i,i+15);
#endif
if (channel_input[i]==0)
modulated_input[i]=1/sqrt(2); //QPSK
else
modulated_input[i]=-1/sqrt(2);
channel_output[i] = modulated_input[i] + gaussdouble(0.0,1.0) * 1/sqrt(2*SNR);
channel_output_fixed[i] = (short) ((channel_output[i]*128)<0?(channel_output[i]*128-0.5):(channel_output[i]*128+0.5)); //fixed point 9-7
}
//for (i=(Kb+nrows) * Zc-5;i<(Kb+nrows) * Zc;i++)
//{
// printf("channel_input[%d]=%d\n",i,channel_input[i]);
//printf("%lf %d\n",channel_output[i], channel_output_fixed[i]);
//printf("v[%d]=%lf\n",i,modulated_input[i]);}
#ifdef DEBUG_CODER
printf("\n");
exit(-1);
#endif
/*
esimated_output=ldpc_decoder(channel_output_fixed, block_length, No_iteration, rate);
//for (i=(Kb+nrows) * Zc-5;i<(Kb+nrows) * Zc;i++)
// printf("esimated_output[%d]=%d\n",i,esimated_output[i]);
// decode the sequence
esimated_output=ldpc_decoder(channel_output_fixed, block_length, No_iteration, rate);
for (i=0;i<(Kb+nrows) * Zc;i++) {
if (esimated_output[i] != channel_input[i]) {
*errors = (*errors) + 1;
break;
}
}
//for (i=(Kb+nrows) * Zc-5;i<(Kb+nrows) * Zc;i++)
// printf("esimated_output[%d]=%d\n",i,esimated_output[i]);
//count errors
for (i=0;i<(Kb+nrows) * Zc;i++)
{
if (esimated_output[i] != channel_input[i])
{
*errors = (*errors) + 1;
break;
}
}
free(channel_input);
free(modulated_input);
free(channel_output);
free(channel_output_fixed);
*/
free(c);
free(channel_input);
free(modulated_input);
free(channel_output);
free(channel_output_fixed);
}
//printf("%d\n",*errors);
}
return *errors;
......@@ -324,49 +231,28 @@ int main(int argc, char *argv[])
{
unsigned int errors,crc_misses;
unsigned int block_length=22*384;
short block_length=22*384;
short No_iteration=25;
double rate=0.2;
double rate=0.667;
double SNR,SNR_lin;
unsigned char qbits;
//time_stats_t time;
unsigned char qbits;
int i=0;
//opp_enabled=1;
// cpu_freq_GHz = get_cpu_freq_GHz();
randominit(0);
//logInit();
randominit(0);
if (argc>1)
qbits = atoi(argv[1]);
else
qbits = 4;
//printf("Quantization bits %d\n",qbits);
unsigned int decoded_errors[100]; // initiate the size of matrix equivalent to
// size of SNR
for (SNR=-2.1; SNR<-2; SNR+=.1) {
qbits = 4;
SNR_lin = pow(10,SNR/10);
/*
ret = test_ldpc(coded_bits,
sigma, // noise standard deviation
qbits,
block_length, // block length bytes
NTRIALS,
&errors,
&trials,
&uerrors,
&crc_misses,
&iterations);
*/
unsigned int decoded_errors[100]; // initiate the size of matrix equivalent to size of SNR
for (SNR=-2.1; SNR<-2; SNR+=.1)
{
// start_meas(&time);
decoded_errors[i]=test_ldpc(No_iteration,
SNR_lin = pow(10,SNR/10);
decoded_errors[i]=test_ldpc(No_iteration,
rate,
SNR_lin, // noise standard deviation
qbits,
......@@ -374,17 +260,14 @@ int main(int argc, char *argv[])
NTRIALS,
&errors,
&crc_misses);
// stop_meas(&time);
//print_meas_now(&time, "", stdout);
printf("SNR %f, BLER %f (%d/%d)\n",SNR,(float)decoded_errors[i]/(float)NTRIALS,decoded_errors[i],NTRIALS);
printf("SNR %f, BLER %f (%d/%d)\n",SNR,(float)decoded_errors[i]/(float)NTRIALS,decoded_errors[i],NTRIALS);
i=i+1;
}
i=i+1;
}
return(0);
}
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