lookup.h

This a framework to test new ideas in transmission technology. Actual development is a LDPC-coder in

#ifndef LOOKUP_H__
#define LOOKUP_H__
// Put OPTIMIZE to 0 to use the original math functions
#define OPTIMIZE 1
//#define T 160
#define T 1200
#define TA 4095
#define MAX_VALUE 10
/* If OPTIMIZE is defined, the lookup-functions are used, else the original
 * functions are used.
 * This function is used to restrict the input values which are in doubles
 * to a MAX specified by the int
 */

double restrict(double,int);

#if OPTIMIZE

// Lookup-table functions for log and exp.
short int lookup_tanh( int x );
short int lookup_atanh( int x );
void lookup_init();
void lookup_exit();

#else

#include <math.h>

#define lookup_init() {}
#define lookup_exit() {}
#define lookup_tanh tanh
#define lookup_atanh() atanh
#endif

#endif