Make d_H inherited from base class.

All equalizer classes had their own private `d_H` vector, despite all being derived from a common `base` class. Now `d_H` is instead a protected member of `base`, and thus accessible to the derived equalizer classes.

lib/equalizer/base.h

@@ -35,6 +35,8 @@ public:
 
 protected:
 	static const gr_complex LONG[64];
+
+	gr_complex d_H[64];
 };
 
 } /* namespace channel_estimation */

lib/equalizer/comb.h

@@ -30,9 +30,6 @@ public:
 	double get_snr();
 
 private:
-	gr_complex d_H[64];
-
-
 	const double alpha = 0.2;
 };
 

lib/equalizer/lms.h

@@ -31,8 +31,6 @@ public:
 private:
 	double get_snr();
 
-
-	gr_complex d_H[64];
 	double d_snr;
 	const double alpha = 0.5;
 };

lib/equalizer/ls.h

@@ -30,7 +30,6 @@ public:
 	virtual void equalize(gr_complex *in, int n, gr_complex *symbols, uint8_t *bits, boost::shared_ptr<gr::digital::constellation> mod);
 	virtual double get_snr();
 private:
-	gr_complex d_H[64];
 	double d_snr;
 };
 

lib/equalizer/sta.h

@@ -31,7 +31,6 @@ public:
 	double get_snr();
 
 private:
-	gr_complex d_H[64];
 	double d_snr;
 
 	const double alpha = 0.5;