change channel.h

 #ifndef __CHANNEL
-
 #define __CHANNEL
 #include <cmath>
 #include <random>
 #include "variables.h"
-class Cchannel {
+
+class Cchannel
+{
 public:
 	Cchannel() {};
 	float *s; // trasmitted signal
-	float r[Nbits / Nbitspersymbol*Nsamplespersymbol]; // corrupted signal
+	float r[Nbits / Nbitspersymbol * Nsamplespersymbol]; // corrupted signal
+	float n[Nbits / Nbitspersymbol * Nsamplespersymbol];
 	void AWGN();
 };
 #endif
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