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#ifndef __CHANNEL
#define __CHANNEL
#include <cmath>
#include <random>
#include "variables.h"
class Cchannel {
public:
Cchannel() {};
float *s; // trasmitted signal
float r[Nbits / Nbitspersymbol*Nsamplespersymbol]; // corrupted signal
void AWGN();
};
#endif
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#include <iostream>
using namespace std;
#include "sender.h"
#include "channel.h"
#include "receiver.h"
#include "evaluate.h"
void main() {
Csender mySender;
Cchannel myChannel;
Creceiver myReceiver;
Cevaluate myEvaluator;
mySender.transmitData(); // generate data[ ], s[ ]
myChannel.s = mySender.s;
myChannel.AWGN(); // calculate r[ ]
myReceiver.r = myChannel.r;
myReceiver.demodulate(); // calculate constellation[ ], DecodedData[ ];
myEvaluator.Data = mySender.data;
myEvaluator.DecodedData = myReceiver.DecodedData;
myEvaluator.evaluate(); // compare the original and the decoded
}
\ No newline at end of file
#ifndef __EVALUATE
#define __EVALUATE
#include <cmath>
#include "variables.h"
class Cevaluate {
public:
Cevaluate() {};
char *DecodedData; // from the receiver
char *Data; // from the sender
void evaluate();
};
#endif
#include <iostream>
#include "myMatrix.h"
using namespace std;
void scalarmult(int n, int m, float a, float *b, float *c){
int N = n*m;
for(int i=0;i<N;i++) c[i] = a*b[i];
}
void matrixadd(int n, int m, float *a, float *b, float *c){
int N = n*m;
for (int i = 0; i<N; i++) c[i] = a[i]+b[i];
}
// (N by K) C X (K by M) D = (N by M) E
void matrixmult(int N, int K, int M, float*C, float*D, float*E) {
int n, k, m;
for (n = 0; n < N; n++)
for (m = 0; m < M; m++) {
float sum = 0;
for (k = 0; k < K; k++) sum += C[n*K + k] * D[k*M + m];
E[n*M + m] = sum;
}
}
// Solve equation Av = b
// return 0 when solution exists,
// -1 when solution does not exist.
// A ==> indentity matrix
// b ==> v (the solution)
int GaussElimination(int N, float *a, float *b)
{
float temp, aii, aji;
int i, j, k;
//showequation(N, a, b);
for (i = 0; i<N; i++) {
aii = a[i*N + i];
if (aii == 0.0) return -1; // 부정/불능 여기 더 할 일 있음
// i-th row를 aii로 모두 나누기
for (k = i; k<N; k++) a[i*N + k] /= aii;
b[i] /= aii;
// 다른 row들의 i번째 항을 모두 0으로 만들기
for (j = 0; j<N; j++) {
if (i != j) {
aji = a[j*N + i];
for (k = i; k<N; k++) a[j*N + k] -= a[i*N + k] * aji;
b[j] -= b[i] * aji;
}// if(i!=j)
} // other rows
//showequation(N, a, b);
}
return 0;
}
void showMatrix(int n, int m, float* F) {
int i, j;
for (i = 0; i < n; i++) {
for (j = 0; j < m; j++) cout << F[i*m + j] << "\t";
cout << "\n";
}
}
void showMatrix(char*name, int n, int m, float* F) {
cout << name << endl;
showMatrix(n, m, F);
}
// show N X N matrix
void showequation(int N, float *a, float *b)
{
int i, j;
for (i = 0; i<N; i++)
{
for (j = 0; j<N; j++) cout << a[i*N + j] << "\t";
cout << b[i];
}
cout << "\n";
}
\ No newline at end of file
void scalarmult(int n, int m, float a, float *b, float *c);
void matrixadd(int n, int m, float *a, float *b, float *c);
void matrixmult(int N, int K, int M, float*C, float*D, float*E);
int GaussElimination(int, float*, float*);
void showMatrix(int n, int m, float* F);
void showMatrix(char*name, int n, int m, float* F);
void showequation(int N, float *a, float *b);
\ No newline at end of file
#ifndef __RECEIVER
#define __RECEIVER
#include <cmath>
#include "variables.h"
class Creceiver {
public:
Creceiver() {};
float *r; // corrupted signal = received signal
float constellation[Nbits];
char DecodedData[Nbits];
void demodulate();
};
void Creceiver::demodulate()
{
for (int i = 0; i < Nbits; i++)
{
constellation[i]=r[i]/Eb;
}
for (int i = 0; i < Nbits; i+=2)
{
if (constellation[i]>0&&constellation[i + 1]>0)
{
DecodedData[i] = 1;
DecodedData[i + 1] = 1;
}
else if (constellation[i]<0&&constellation[i + 1]>0)
{
DecodedData[i] = 0;
DecodedData[i + 1] = 1;
}
else if (constellation[i]<0 &&constellation[i + 1]<0)
{
DecodedData[i] = 0;
DecodedData[i + 1] = 0;
}
else if (constellation[i] >0 && constellation[i + 1]<0)
{
DecodedData[i] = 1;
DecodedData[i + 1] = 0;
}
}
}
#endif
#ifndef __RECEIVER
#define __RECEIVER
#include <cmath>
#include "variables.h"
class Creceiver {
public:
Creceiver() {};
float *r; // corrupted signal = received signal
float constellation[Nbits];
char DecodedData[Nbits];
void demodulate();
};
#endif
#ifndef __SENDER
#define __SENDER
#include <cmath>
#include "variables.h"
class Csender {
public:
Csender() {};
char data[Nbits];
float s[Nbits/Nbitspersymbol*Nsamplespersymbol]; // trasmitted signal
void transmitData();
};
#endif
#ifndef __VARIABLES
#define __VARIABLES
#define Nbits 1000 // number of transmitted bits
#define Nsamplespersymbol 20
#define Nbitspersymbol 2 // QPSK
#define Eb 40 // fixed
#define No 4 // at SNR = 20dB, variable
#endif