int main()
{
int infoBit[N],demodedBit[N];
double modedSeq[N],receivedSeq[N];
int count,SNRnum=11;
double SNR[11] = {0,1,2,3,4,5,6,7,8,9,10};
double ber[11];
double totalbit,errorbit,errorlimit=50;
int i;
FILE *fp;
for(count=0;count<SNRnum;count++)
{
errorbit=0;totalbit=0;
while(errorbit<errorlimit)
{
srand((unsigned)time(NULL));
for(i=0;i<N;i++)
{
infoBit[i] = rand()%2;
//printf("%2d",infoSequ[i]);
}
//printf("\n");
totalbit += N;
BPSKmodeled(infoBit,modedSeq,N);
AWGN(modedSeq,receivedSeq,SNR[count],N);
//awgn(SNR[count],modedSeq,receivedSeq);
BPSKdemodeled(receivedSeq,demodedBit,N);
for(i=0;i<N;i++)
{
if(infoBit[i]!=demodedBit[i])
errorbit++;
}
}
ber[count] = errorbit/totalbit;
}
if((fp=fopen("BERresult.txt","w")) == NULL)
printf("can't open the file!\n");
else
for(i=0;i<SNRnum;i++)
{
fprintf(fp,"%f ",ber[i]);
printf("%f",ber[i]);
printf("\n");
}
fclose(fp);
system("pause");
return 0;
}
int main(){
/* Compressing the data using Huffman encoding*/
encode();
FRAME_LENGTH = codes.length(); // this would contain the compressed, Huffman coded bits
/* TURBO ENCODING */
int *trafficflow_source = NULL,traffic_source_length, *trafficflow_decoded = NULL, err_bit_num_traffic[8],i, j, ien,total;
float *coded_trafficflow_source = NULL,*trafficflow_for_decode = NULL,EbN0dB = 0,en, sgma,err_bit_rate_traffic[8], max_LLR = 0.0;
double Eb_N0_dB[8] = {2.8,2.8,2.8,2.8,2.8,2.8,2.8,2.8};
int codedlength = 2*FRAME_LENGTH*sizeof(float);
clock_t start, endtime;
trafficflow_source=(int *)malloc(FRAME_LENGTH*sizeof(int)); //systematic data length
coded_trafficflow_source=(float *)malloc(2*FRAME_LENGTH*sizeof(float)); //systematic data + parity
trafficflow_for_decode=(float *)malloc(2*FRAME_LENGTH*sizeof(float));//coded data at the receiving end
trafficflow_decoded=(int *)malloc(FRAME_LENGTH*sizeof(int));//data after decoding
traffic_source_length = FRAME_LENGTH; //source data length
/* Initialize the parameters for Turbo encoding */
TurboCodingInit(traffic_source_length);
/*==== output the simulation parameters to screen======*/
printf("\n======================== Turbo code simulation :========================\n");
printf("\n Some parameters are as follows: \n");
printf("\nlog map decoder\n");
printf("frame length : %d \n", traffic_source_length);
printf("generators g = \n");
for (i=0; i<turbo_g.N_num_row; i++)
{
for (j=0; j<turbo_g.K_num_col; j++)
{
printf(" %d ", *(turbo_g.g_matrix+i*turbo_g.K_num_col+j));
}
printf("\n");
}
//TO BE REMOVED
ien=0;
/* Printing the SNR */
//for (ien=0; ien<8; ien++) // for the Simulations
//{
total = 0;
printf("\n /*---------------------------------------------*/\n");
printf("\n Simulation %d \n", ien + 1);
EbN0dB = (float)Eb_N0_dB[ien];
en = (float)pow(10,(EbN0dB)/10);
sgma = (float)(1.0/sqrt(2*rate_coding*en));
err_bit_num_traffic[ien] = 0;
err_bit_rate_traffic[ien] = 0.0;
printf("\n Eb/N0 = %f \n", EbN0dB);
if (TURBO_PUNCTURE)
printf(" punctured to rate 1/2\n");
else
printf(" unpunctured\n");
printf(" Number of iterations: %d \n", N_ITERATION);
if (TURBO_PUNCTURE)
printf( "\n punctured to rate 1/2\n");
else
printf( "\n unpunctured\n");
/* Turbo Encoding commencing */
start=clock();/*staring time*/
cout << "Starting time : " << start <<"\n";
traffic_source_length = FRAME_LENGTH;
gen_source(trafficflow_source, traffic_source_length);
cout << "Printing the generated traffic flow source \n";
for (i=0; i< traffic_source_length ; i++){
cout << *(trafficflow_source+i) << " ";
}
cout <<"\n";
//-----------------------------------------------------------
/* Turbo Encoding */
cout << "Commencing Turbo encoding \n";
TurboCodingTraffic(trafficflow_source, coded_trafficflow_source, &traffic_source_length);
cout<<"\n Turbo Coded data \n";
for(i=0;i<codedlength;i++){
cout << *(coded_trafficflow_source+i) <<" ";
}
cout<<"\n \nTurbo Encoding complete \n";
//------------------------------------------------------------
/* Adding AWGN Noise to corrupt the data */
AWGN(coded_trafficflow_source, trafficflow_for_decode, sgma,traffic_source_length);
cout<<"\n Coded data after adding Noise : Coded data length : "<< codedlength << " \n";
for(i=0;i<codedlength;i++){
cout << *(trafficflow_for_decode+i) <<" ";
}
//-----------------------------------------------------------
cout<<"\n \n Commencing Turbo Decode \n";
cout <<"@@@@"<< traffic_source_length<<"\n";
/* Turbo decoding */
TurboDecodingTraffic(trafficflow_for_decode, trafficflow_decoded, &traffic_source_length, EbN0dB);
//TurboDecodingTraffic(float *trafficflow_for_decode, int *trafficflow_decoded,int *trafficflow_length, float EbN0dB)
cout<<"\n Turbo Decoding complete \n";
//int resultSize = result.size();
for(int p=0;p<final_result.size();p++){
cout<<final_result[p].code << " : "<<final_result[p].c <<"\n";
}
/*
for (i=0; i< traffic_source_length ; i++)
{
if (*(trafficflow_source+i) != *(trafficflow_decoded+i))
{
err_bit_num_traffic[ien] = err_bit_num_traffic[ien]+1;
printf("LLR[%d] = %f\n\n",*(reverse_index_randomintlvr + i), *(LLR_all_turbo + *(reverse_index_randomintlvr + i) ));
if(fabs(*(LLR_all_turbo + *(reverse_index_randomintlvr + i) )) > max_LLR)
max_LLR = fabs(*(LLR_all_turbo + *(reverse_index_randomintlvr + i)));
}
else
{
printf("LLR[%d] = %f\n\n",*(reverse_index_randomintlvr + i), *(LLR_all_turbo + *(reverse_index_randomintlvr + i) ));
}
}
for (i=0; i< traffic_source_length ; i++)
{
if (*(trafficflow_source+i) == *(trafficflow_decoded+i)&&fabs(*(LLR_all_turbo +*(reverse_index_randomintlvr + i))) < max_LLR)
{
total ++;
}
}
float wrong = (float) total/(float) traffic_source_length;
err_bit_rate_traffic[ien] = (float)err_bit_num_traffic[ien]/(traffic_source_length) ;
printf("\n The Error bit probability is %f \n",err_bit_rate_traffic[ien]);
printf("\n The Error bit probability is %f \n",err_bit_rate_traffic[ien]);
printf("maxmum LLR of error bit is %f and SNR is %f \n\n", max_LLR,EbN0dB);
printf("Among correct bits, there are %f % of them whose LLR less than max_LLR\n", wrong);
printf("===========================================================================\n\n");
printf("===========================================================================\n\n");
*/
decode();
endtime=clock();
double totalTime = double(endtime - start)/CLOCKS_PER_SEC;
cout<< "%Total time taken : "<<totalTime;
cout<<"\n";
printf("The corresponding LLR of error bits for simulation %d :\n\n", ien + 1);
free(LLR_all_turbo);
//}
return 0;
}
