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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
\ No newline at end of file

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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