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openairinterface5g/openair1/PHY/CODING/TESTBENCH/ldpctest.c
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/*
* Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The OpenAirInterface Software Alliance licenses this file to You under
* the OAI Public License, Version 1.1 (the "License"); you may not use this file
* except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.openairinterface.org/?page_id=698
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*-------------------------------------------------------------------------------
* For more information about the OpenAirInterface (OAI) Software Alliance:
* contact@openairinterface.org
*/
#include <stdlib.h>
#include <math.h>
#include <stdio.h>
#include <string.h>
#include "assertions.h"
#include "SIMULATION/TOOLS/sim.h"
#include "PHY/CODING/nrLDPC_extern.h"
#include "openair1/SIMULATION/NR_PHY/nr_unitary_defs.h"
#include "openair1/PHY/CODING/nrLDPC_decoder_LYC/nrLDPC_decoder_LYC.h"
#define MAX_NUM_DLSCH_SEGMENTS 16
#define MAX_BLOCK_LENGTH 8448
#ifndef malloc16
# ifdef __AVX2__
# define malloc16(x) memalign(32,x)
# else
# define malloc16(x) memalign(16,x)
# endif
#endif
#define NR_LDPC_PROFILER_DETAIL
#define NR_LDPC_ENABLE_PARITY_CHECK
// 4-bit quantizer
char quantize4bit(double D,double x)
{
double qxd;
qxd = floor(x/D);
// printf("x=%f,qxd=%f\n",x,qxd);
if (qxd <= -8)
qxd = -8;
else if (qxd > 7)
qxd = 7;
return((char)qxd);
}
char quantize8bit(double D,double x)
{
double qxd;
//char maxlev;
qxd = floor(x/D);
//maxlev = 1<<(B-1);
//printf("x=%f,qxd=%f,maxlev=%d\n",x,qxd, maxlev);
if (qxd <= -128)
qxd = -128;
else if (qxd >= 128)
qxd = 127;
return((char)qxd);
}
typedef struct {
double n_iter_mean;
double n_iter_std;
int n_iter_max;
} n_iter_stats_t;
RAN_CONTEXT_t RC;
PHY_VARS_UE ***PHY_vars_UE_g;
uint16_t NB_UE_INST = 1;
nrLDPC_encoderfunc_t encoder_orig;
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};
int test_ldpc(short No_iteration,
int nom_rate,
int denom_rate,
double SNR,
unsigned char qbits,
short block_length,
unsigned int ntrials,
int n_segments,
unsigned int *errors,
unsigned int *errors_bit,
double *errors_bit_uncoded,
unsigned int *crc_misses,
time_stats_t *time_optim,
time_stats_t *time_decoder,
n_iter_stats_t *dec_iter,
short run_cuda)
{
//clock initiate
//time_stats_t time,time_optim,tinput,tprep,tparity,toutput, time_decoder;
time_stats_t time, tinput,tprep,tparity,toutput;
double n_iter_mean = 0;
double n_iter_std = 0;
int n_iter_max = 0;
unsigned int segment_bler = 0;
double sigma;
sigma = 1.0/sqrt(2*SNR);
opp_enabled=1;
cpu_freq_GHz = get_cpu_freq_GHz();
//short test_input[block_length];
unsigned char *test_input[MAX_NUM_DLSCH_SEGMENTS]={NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL};;
//short *c; //padded codeword
unsigned char *estimated_output[MAX_NUM_DLSCH_SEGMENTS];
unsigned char *estimated_output_bit[MAX_NUM_DLSCH_SEGMENTS];
unsigned char *test_input_bit;
unsigned char *channel_input[MAX_NUM_DLSCH_SEGMENTS];
unsigned char *channel_output_uncoded[MAX_NUM_DLSCH_SEGMENTS];
unsigned char *channel_input_optim[MAX_NUM_DLSCH_SEGMENTS];
double *channel_output;
double *modulated_input[MAX_NUM_DLSCH_SEGMENTS];
char *channel_output_fixed[MAX_NUM_DLSCH_SEGMENTS];
unsigned int i,j,trial=0;
short BG=0,nrows=0;//,ncols;
int no_punctured_columns,removed_bit;
int i1,Zc,Kb=0;
int R_ind = 0;
//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};
//int n_segments=1;
int code_rate_vec[8] = {15, 13, 25, 12, 23, 34, 56, 89};
//double code_rate_actual_vec[8] = {0.2, 0.33333, 0.4, 0.5, 0.66667, 0.73333, 0.81481, 0.88};
t_nrLDPC_dec_params decParams;
t_nrLDPC_procBuf nrLDPC_procBuf;
t_nrLDPC_procBuf* p_nrLDPC_procBuf = &nrLDPC_procBuf;
t_nrLDPC_time_stats decoder_profiler;
t_nrLDPC_time_stats* p_decoder_profiler =&decoder_profiler ;
int32_t n_iter = 0;
*errors=0;
*errors_bit=0;
*errors_bit_uncoded=0;
*crc_misses=0;
// generate input block
for(j=0;j<MAX_NUM_DLSCH_SEGMENTS;j++) {
test_input[j]=(unsigned char *)malloc16(sizeof(unsigned char) * block_length/8);
channel_input[j] = (unsigned char *)malloc16(sizeof(unsigned char) * 68*384);
channel_input_optim[j] = (unsigned char *)malloc16(sizeof(unsigned char) * 68*384);
channel_output_uncoded[j] = (unsigned char *)malloc16(sizeof(unsigned char) * 68*384);
estimated_output[j] = (unsigned char*) malloc16(sizeof(unsigned char) * block_length);
estimated_output_bit[j] = (unsigned char*) malloc16(sizeof(unsigned char) * block_length);
modulated_input[j] = (double *)malloc16(sizeof(double) * 68*384);
channel_output_fixed[j] = (char *)malloc16(sizeof( char) * 68*384);
}
//modulated_input = (double *)malloc(sizeof(double) * 68*384);
//channel_output = (double *)malloc(sizeof(double) * 68*384);
//channel_output_fixed = (char *)malloc16(sizeof(char) * 68*384);
//modulated_input = (double *)calloc(68*384, sizeof(double));
channel_output = (double *)calloc(68*384, sizeof(double));
//channel_output_fixed = (double *)calloc(68*384, sizeof(double));
//channel_output_fixed = (unsigned char*)calloc(68*384, sizeof(unsigned char*));
//estimated_output = (unsigned char*) malloc16(sizeof(unsigned char) * block_length);///8);
//estimated_output_bit = (unsigned char*) malloc16(sizeof(unsigned char) * block_length);
test_input_bit = (unsigned char*) malloc16(sizeof(unsigned char) * block_length);
reset_meas(&time);
reset_meas(time_optim);
reset_meas(time_decoder);
reset_meas(&tinput);
reset_meas(&tprep);
reset_meas(&tparity);
reset_meas(&toutput);
//Reset Decoder profiles
reset_meas(&decoder_profiler.llr2llrProcBuf);
reset_meas(&decoder_profiler.llr2CnProcBuf);
reset_meas(&decoder_profiler.cnProc);
reset_meas(&decoder_profiler.cnProcPc);
reset_meas(&decoder_profiler.bnProc);
reset_meas(&decoder_profiler.bnProcPc);
reset_meas(&decoder_profiler.cn2bnProcBuf);
reset_meas(&decoder_profiler.bn2cnProcBuf);
reset_meas(&decoder_profiler.llrRes2llrOut);
reset_meas(&decoder_profiler.llr2bit);
//reset_meas(&decoder_profiler.total);
// Allocate LDPC decoder buffers
p_nrLDPC_procBuf = nrLDPC_init_mem();
for (j=0;j<MAX_NUM_DLSCH_SEGMENTS;j++) {
for (i=0; i<block_length/8; i++) {
test_input[j][i]=(unsigned char) rand();
//test_input[j][i]=j%256;
//test_input[j][i]=252;
}
}
//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; //parity check bits
//ncols=10; // info bits
if (block_length>640)
Kb = 10;
else if (block_length>560)
Kb = 9;
else if (block_length>192)
Kb = 8;
else
Kb = 6;
}
if (nom_rate == 1)
if (denom_rate == 5)
if (BG == 2)
R_ind = 0;
else
printf("Not supported");
else if (denom_rate == 3)
R_ind = 1;
else if (denom_rate == 2)
//R_ind = 3;
printf("Not supported");
else
printf("Not supported");
else if (nom_rate == 2)
if (denom_rate == 5)
//R_ind = 2;
printf("Not supported");
else if (denom_rate == 3)
R_ind = 4;
else
printf("Not supported");
else if ((nom_rate == 22) && (denom_rate == 30))
//R_ind = 5;
printf("Not supported");
else if ((nom_rate == 22) && (denom_rate == 27))
//R_ind = 6;
printf("Not supported");
else if ((nom_rate == 22) && (denom_rate == 25))
if (BG == 1)
R_ind = 7;
else
printf("Not supported");
else
printf("Not supported");
//find minimum value in all sets of lifting size
Zc=0;
for (i1=0; i1 < 51; i1++)
{
if (lift_size[i1] >= (double) block_length/Kb)
{
Zc = lift_size[i1];
//printf("%d\n",Zc);
break;
}
}
printf("ldpc_test: codeword_length %d, n_segments %d, block_length %d, BG %d, Zc %d, Kb %d\n",n_segments *block_length, n_segments, block_length, BG, Zc, Kb);
no_punctured_columns=(int)((nrows-2)*Zc+block_length-block_length*(1/((float)nom_rate/(float)denom_rate)))/Zc;
// printf("puncture:%d\n",no_punctured_columns);
removed_bit=(nrows-no_punctured_columns-2) * Zc+block_length-(int)(block_length/((float)nom_rate/(float)denom_rate));
encoder_implemparams_t impp=INIT0_LDPCIMPLEMPARAMS;
impp.gen_code=1;
if (ntrials==0)
encoder_orig(test_input,channel_input, Zc, BG, block_length, BG, &impp);
impp.gen_code=0;
for (trial=0; trial < ntrials; trial++)
{
segment_bler = 0;
//// encoder
start_meas(&time);
for(j=0;j<n_segments;j++) {
encoder_orig(&(test_input[j]), &(channel_input[j]),Zc,Kb,block_length,BG,&impp);
}
stop_meas(&time);
/* start_meas(time_optim);
ldpc_encoder_optim_8seg(test_input,channel_input_optim,Zc,Kb,block_length,BG,n_segments,&tinput,&tprep,&tparity,&toutput);
for(j=0;j<n_segments;j++) {
ldpc_encoder_optim(test_input[j],channel_input_optim[j],Zc,Kb,block_length,BG,&tinput,&tprep,&tparity,&toutput);
}
stop_meas(time_optim);*/
impp.n_segments=n_segments;
for(j=0;j<(n_segments/8+1);j++) {
start_meas(time_optim);
impp.macro_num=j;
nrLDPC_encoder(test_input,channel_input_optim,Zc,Kb,block_length, BG, &impp);
stop_meas(time_optim);
}
if (ntrials==1)
for (j=0;j<n_segments;j++)
for (i = 0; i < block_length+(nrows-no_punctured_columns) * Zc - removed_bit; i++)
if (channel_input[j][i]!=channel_input_optim[j][i]) {
printf("differ in seg %u pos %u (%u,%u)\n", j, i, channel_input[j][i], channel_input_optim[j][i]);
free(channel_output);
return (-1);
}
//else{
// printf("NOT differ in seg %d pos %d (%d,%d)\n",j,i,channel_input[j][i],channel_input_optim[j][i]);
// }
if (trial== 0) {
printf("nrows: %d\n", nrows);
printf("no_punctured_columns: %d\n", no_punctured_columns);
printf("removed_bit: %d\n", removed_bit);
printf("To: %d\n", (Kb+nrows-no_punctured_columns) * Zc-removed_bit);
printf("number of undecoded bits: %d\n", (Kb+nrows-no_punctured_columns-2) * Zc-removed_bit);
}
//print_meas_now(&time, "", stdout);
// for (i=0;i<6400;i++)
//printf("channel_input[%d]=%d\n",i,channel_input[i]);
//printf("%d ",channel_input[i]);
//if ((BG==2) && (Zc==128||Zc==256))
if (1) { // Transmitting one segment
for(j=0;j<n_segments;j++) {
for (i = 2*Zc; i < (Kb+nrows-no_punctured_columns) * Zc-removed_bit; i++) {
#ifdef DEBUG_CODER
if ((i&0xf)==0)
printf("\ne %u..%u: ",i,i+15);
#endif
if (channel_input_optim[j][i-2*Zc]==0)
modulated_input[j][i]=1.0;///sqrt(2); //QPSK
else
modulated_input[j][i]=-1.0;///sqrt(2);
///channel_output[i] = modulated_input[i] + gaussdouble(0.0,1.0) * 1/sqrt(2*SNR);
//channel_output_fixed[i] = (char) ((channel_output[i]*128)<0?(channel_output[i]*128-0.5):(channel_output[i]*128+0.5)); //fixed point 9-7
//printf("llr[%d]=%d\n",i,channel_output_fixed[i]);
//channel_output_fixed[i] = (char)quantize(sigma/4.0,(2.0*modulated_input[i]) - 1.0 + sigma*gaussdouble(0.0,1.0),qbits);
channel_output_fixed[j][i] = (char)quantize(sigma/4.0/4.0,modulated_input[j][i] + sigma*gaussdouble(0.0,1.0),qbits);
//channel_output_fixed[i] = (char)quantize8bit(sigma/4.0,(2.0*modulated_input[i]) - 1.0 + sigma*gaussdouble(0.0,1.0));
//printf("llr[%d]=%d\n",i,channel_output_fixed[i]);
//printf("channel_output_fixed[%d]: %d\n",i,channel_output_fixed[i]);
//channel_output_fixed[i] = (char)quantize(1,channel_output_fixed[i],qbits);
//Uncoded BER
if (channel_output_fixed[j][i]<0)
channel_output_uncoded[j][i]=1; //QPSK demod
else
channel_output_uncoded[j][i]=0;
if (channel_output_uncoded[j][i] != channel_input_optim[j][i-2*Zc])
*errors_bit_uncoded = (*errors_bit_uncoded) + 1;
}
} // End segments
//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
decParams.BG=BG;
decParams.Z=Zc;
decParams.R=code_rate_vec[R_ind];//13;
decParams.numMaxIter=No_iteration;
decParams.outMode = nrLDPC_outMode_BIT;
//decParams.outMode =nrLDPC_outMode_LLRINT8;
#ifdef CUDA_FLAG
set_compact_BG(Zc,BG);
init_LLR_DMA_for_CUDA(&decParams, (int8_t*)channel_output_fixed[j], (int8_t*)estimated_output[j], block_length);
#endif
for(j=0;j<n_segments;j++) {
start_meas(time_decoder);
#ifdef CUDA_FLAG
if(run_cuda){
n_iter = nrLDPC_decoder_LYC(&decParams, (int8_t*)channel_output_fixed[j], (int8_t*)estimated_output[j], block_length, time_decoder);
}
else{
// decode the sequence
// decoder supports BG2, Z=128 & 256
//esimated_output=ldpc_decoder(channel_output_fixed, block_length, No_iteration, (double)((float)nom_rate/(float)denom_rate));
///nrLDPC_decoder(&decParams, channel_output_fixed, estimated_output, NULL);
n_iter = nrLDPC_decoder(&decParams, (int8_t*)channel_output_fixed[j], (int8_t*)estimated_output[j], p_nrLDPC_procBuf, p_decoder_profiler);
}
#else
n_iter = nrLDPC_decoder(&decParams, (int8_t*)channel_output_fixed[j], (int8_t*)estimated_output[j], p_nrLDPC_procBuf, p_decoder_profiler);
#endif
stop_meas(time_decoder);
}
//for (i=(Kb+nrows) * Zc-5;i<(Kb+nrows) * Zc;i++)
// printf("esimated_output[%d]=%d\n",i,esimated_output[i]);
//count errors
for(j=0;j<n_segments;j++) {
for (i=0; i<block_length>>3; i++)
{
//printf("block_length>>3: %d \n",block_length>>3);
/// printf("i: %d \n",i);
///printf("estimated_output[%d]: %d \n",i,estimated_output[i]);
///printf("test_input[0][%d]: %d \n",i,test_input[0][i]);
if (estimated_output[j][i] != test_input[j][i])
{
//////printf("error pos %d (%d, %d)\n\n",i,estimated_output[i],test_input[0][i]);
segment_bler = segment_bler + 1;
break;
}
}
for (i=0; i<block_length; i++)
{
estimated_output_bit[j][i] = (estimated_output[j][i/8]&(1<<(i&7)))>>(i&7);
test_input_bit[i] = (test_input[j][i/8]&(1<<(i&7)))>>(i&7); // Further correct for multiple segments
if (estimated_output_bit[j][i] != test_input_bit[i])
{
*errors_bit = (*errors_bit) + 1;
}
}
//if (*errors == 1000)
//break;
n_iter_mean = n_iter_mean + n_iter;
n_iter_std = n_iter_std + pow(n_iter-1,2);
if ( n_iter > n_iter_max )
n_iter_max = n_iter;
} // end segments
if (segment_bler != 0)
*errors = (*errors) + 1;
}
/*else if (trial==0)
printf("decoder is not supported\n");*/
}
dec_iter->n_iter_mean = n_iter_mean/(double)ntrials/(double)n_segments - 1;
dec_iter->n_iter_std = sqrt(n_iter_std/(double)ntrials/(double)n_segments - pow(n_iter_mean/(double)ntrials/(double)n_segments - 1,2));
dec_iter->n_iter_max = n_iter_max -1;
*errors_bit_uncoded = *errors_bit_uncoded / (double)((Kb+nrows-no_punctured_columns-2) * Zc-removed_bit);
for(j=0;j<MAX_NUM_DLSCH_SEGMENTS;j++) {
free(test_input[j]);
free(channel_input[j]);
free(channel_output_uncoded[j]);
free(channel_input_optim[j]);
free(modulated_input[j]);
free(channel_output_fixed[j]);
free(estimated_output[j]);
free(estimated_output_bit[j]);
}
//free(modulated_input);
free(channel_output);
//free(channel_output_fixed);
//free(estimated_output);
nrLDPC_free_mem(p_nrLDPC_procBuf);
print_meas(&time,"ldpc_encoder",NULL,NULL);
print_meas(time_optim,"ldpc_encoder_optim",NULL,NULL);
print_meas(&tinput,"ldpc_encoder_optim(input)",NULL,NULL);
print_meas(&tprep,"ldpc_encoder_optim(prep)",NULL,NULL);
print_meas(&tparity,"ldpc_encoder_optim(parity)",NULL,NULL);
print_meas(&toutput,"ldpc_encoder_optim(output)",NULL,NULL);
printf("\n");
print_meas(time_decoder,"ldpc_decoder",NULL,NULL);
print_meas(&decoder_profiler.llr2llrProcBuf,"llr2llrProcBuf",NULL,NULL);
print_meas(&decoder_profiler.llr2CnProcBuf,"llr2CnProcBuf",NULL,NULL);
print_meas(&decoder_profiler.cnProc,"cnProc (per iteration)",NULL,NULL);
print_meas(&decoder_profiler.cnProcPc,"cnProcPc (per iteration)",NULL,NULL);
print_meas(&decoder_profiler.bnProc,"bnProc (per iteration)",NULL,NULL);
print_meas(&decoder_profiler.bnProcPc,"bnProcPc(per iteration)",NULL,NULL);
print_meas(&decoder_profiler.cn2bnProcBuf,"cn2bnProcBuf (per iteration)",NULL,NULL);
print_meas(&decoder_profiler.bn2cnProcBuf,"bn2cnProcBuf (per iteration)",NULL,NULL);
print_meas(&decoder_profiler.llrRes2llrOut,"llrRes2llrOut",NULL,NULL);
print_meas(&decoder_profiler.llr2bit,"llr2bit",NULL,NULL);
printf("\n");
return *errors;
}
int main(int argc, char *argv[])
{
#ifdef CUDA_FLAG
warmup_for_GPU();
#endif
unsigned int errors, errors_bit, crc_misses;
double errors_bit_uncoded;
short block_length=8448; // decoder supports length: 1201 -> 1280, 2401 -> 2560
short No_iteration=5;
int n_segments=1;
//double rate=0.333;
short run_cuda = 0;
int nom_rate=1;
int denom_rate=3;
double SNR0=-2.0,SNR,SNR_lin;
unsigned char qbits=8;
unsigned int decoded_errors[10000]; // initiate the size of matrix equivalent to size of SNR
int c,i=0, i1 = 0;
int n_trials = 1;
double SNR_step = 0.1;
randominit(0);
int test_uncoded= 0;
time_stats_t time_optim[10], time_decoder[10];
n_iter_stats_t dec_iter[3];
short BG=0,Zc,Kb=0;
while ((c = getopt (argc, argv, "q:r:s:S:l:G:n:d:i:t:u:h")) != -1)
switch (c)
{
case 'q':
qbits = atoi(optarg);
break;
case 'r':
nom_rate = atoi(optarg);
break;
case 'd':
denom_rate = atoi(optarg);
break;
case 'l':
block_length = atoi(optarg);
break;
case 'G':
run_cuda = atoi(optarg);
break;
case 'n':
n_trials = atoi(optarg);
break;
case 's':
SNR0 = atof(optarg);
break;
case 'S':
n_segments = atof(optarg);
break;
case 't':
SNR_step = atof(optarg);
break;
case 'i':
No_iteration = atoi(optarg);
break;
case 'u':
test_uncoded = atoi(optarg);
break;
case 'h':
default:
printf("CURRENTLY SUPPORTED CODE RATES: \n");
printf("BG1 (blocklength > 3840): 1/3, 2/3, 22/25 (8/9) \n");
printf("BG2 (blocklength <= 3840): 1/5, 1/3, 2/3 \n\n");
printf("-h This message\n");
printf("-q Quantization bits, Default: 8\n");
printf("-r Nominator rate, (1, 2, 22), Default: 1\n");
printf("-d Denominator rate, (3, 5, 25), Default: 1\n");
printf("-l Block length (l > 3840 -> BG1, rest BG2 ), Default: 8448\n");
printf("-G give 1 to run cuda for LDPC, Default: 0\n");
printf("-n Number of simulation trials, Default: 1\n");
//printf("-M MCS2 for TB 2\n");
printf("-s SNR per information bit (EbNo) in dB, Default: -2\n");
printf("-S Number of segments (Maximum: 8), Default: 1\n");
printf("-t SNR simulation step, Default: 0.1\n");
printf("-i Max decoder iterations, Default: 5\n");
printf("-u Set SNR per coded bit, Default: 0\n");
exit(1);
break;
}
cpu_freq_GHz = get_cpu_freq_GHz();
//printf("the decoder supports BG2, Kb=10, Z=128 & 256\n");
//printf(" range of blocklength: 1201 -> 1280, 2401 -> 2560\n");
printf("block length %d: \n", block_length);
printf("n_trials %d: \n", n_trials);
printf("SNR0 %f: \n", SNR0);
load_nrLDPClib();
load_nrLDPClib_ref("_orig", &encoder_orig);
//for (block_length=8;block_length<=MAX_BLOCK_LENGTH;block_length+=8)
//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; //parity check bits
//ncols=10; // info bits
if (block_length>640)
Kb = 10;
else if (block_length>560)
Kb = 9;
else if (block_length>192)
Kb = 8;
else
Kb = 6;
}
//find minimum value in all sets of lifting size
Zc=0;
for (i1=0; i1 < 51; i1++)
{
if (lift_size[i1] >= (double) block_length/Kb)
{
Zc = lift_size[i1];
//printf("%d\n",Zc);
break;
}
}
char fname[200];
sprintf(fname,"ldpctest_BG_%d_Zc_%d_rate_%d-%d_block_length_%d_maxit_%d.txt",BG,Zc,nom_rate,denom_rate,block_length, No_iteration);
FILE *fd=fopen(fname,"w");
AssertFatal(fd!=NULL,"cannot open %s\n",fname);
fprintf(fd,"SNR BLER BER UNCODED_BER ENCODER_MEAN ENCODER_STD ENCODER_MAX DECODER_TIME_MEAN DECODER_TIME_STD DECODER_TIME_MAX DECODER_ITER_MEAN DECODER_ITER_STD DECODER_ITER_MAX\n");
for (SNR=SNR0;SNR<SNR0+20.0;SNR+=SNR_step) {
//reset_meas(&time_optim);
//reset_meas(&time_decoder);
//n_iter_stats_t dec_iter = {0, 0, 0};
if (test_uncoded == 1)
SNR_lin = pow(10,SNR/10.0);
else
SNR_lin = pow(10,SNR/10.0)*nom_rate/denom_rate;
printf("Linear SNR: %f\n", SNR_lin);
decoded_errors[i]=test_ldpc(No_iteration,
nom_rate,
denom_rate,
SNR_lin, // noise standard deviation
qbits,
block_length, // block length bytes
n_trials,
n_segments,
&errors,
&errors_bit,
&errors_bit_uncoded,
&crc_misses,
time_optim,
time_decoder,
dec_iter,
run_cuda);
printf("SNR %f, BLER %f (%u/%d)\n", SNR, (float)decoded_errors[i]/(float)n_trials, decoded_errors[i], n_trials);
printf("SNR %f, BER %f (%u/%d)\n", SNR, (float)errors_bit/(float)n_trials/(float)block_length/(double)n_segments, decoded_errors[i], n_trials);
printf("SNR %f, Uncoded BER %f (%u/%d)\n",SNR, errors_bit_uncoded/(float)n_trials/(double)n_segments, decoded_errors[i], n_trials);
printf("SNR %f, Mean iterations: %f\n",SNR, dec_iter->n_iter_mean);
printf("SNR %f, Std iterations: %f\n",SNR, dec_iter->n_iter_std);
printf("SNR %f, Max iterations: %d\n",SNR, dec_iter->n_iter_max);
printf("\n");
printf("Encoding time mean: %15.3f us\n",(double)time_optim->diff/time_optim->trials/1000.0/cpu_freq_GHz);
printf("Encoding time std: %15.3f us\n",sqrt((double)time_optim->diff_square/time_optim->trials/pow(1000,2)/pow(cpu_freq_GHz,2)-pow((double)time_optim->diff/time_optim->trials/1000.0/cpu_freq_GHz,2)));
printf("Encoding time max: %15.3f us\n",(double)time_optim->max/1000.0/cpu_freq_GHz);
printf("\n");
printf("Decoding time mean: %15.3f us\n",(double)time_decoder->diff/time_decoder->trials/1000.0/cpu_freq_GHz);
printf("Decoding time std: %15.3f us\n",sqrt((double)time_decoder->diff_square/time_decoder->trials/pow(1000,2)/pow(cpu_freq_GHz,2)-pow((double)time_decoder->diff/time_decoder->trials/1000.0/cpu_freq_GHz,2)));
printf("Decoding time max: %15.3f us\n",(double)time_decoder->max/1000.0/cpu_freq_GHz);
fprintf(fd,"%f %f %f %f %f %f %f %f %f %f %f %f %d \n",
SNR,
(double)decoded_errors[i]/(double)n_trials ,
(double)errors_bit/(double)n_trials/(double)block_length/(double)n_segments ,
errors_bit_uncoded/(double)n_trials/(double)n_segments ,
(double)time_optim->diff/time_optim->trials/1000.0/cpu_freq_GHz,
sqrt((double)time_optim->diff_square/time_optim->trials/pow(1000,2)/pow(cpu_freq_GHz,2)-pow((double)time_optim->diff/time_optim->trials/1000.0/cpu_freq_GHz,2)),
(double)time_optim->max/1000.0/cpu_freq_GHz,
(double)time_decoder->diff/time_decoder->trials/1000.0/cpu_freq_GHz,
sqrt((double)time_decoder->diff_square/time_decoder->trials/pow(1000,2)/pow(cpu_freq_GHz,2)-pow((double)time_decoder->diff/time_decoder->trials/1000.0/cpu_freq_GHz,2)),
(double)time_decoder->max/1000.0/cpu_freq_GHz,
dec_iter->n_iter_mean,
dec_iter->n_iter_std,
dec_iter->n_iter_max
);
if (decoded_errors[i] == 0) break;
i=i+1;
}
fclose(fd);
return(0);
}
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