/* -*-	Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */
/*
 * Copyright (c) 1997 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the Computer Systems
 *	Engineering Group at Lawrence Berkeley Laboratory.
 * 4. Neither the name of the University nor of the Laboratory may be used
 *    to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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/* Ported from CMU/Monarch's code, nov'98 -Padma.*/

#ifndef __modulation_h__
#define __modulation_h__

/* ======================================================================
   Modulation Schemes

	Using the receive power and information about the modulation
	scheme, amount of forward error correction, etc., this class
	computes whether or not a packet was received correctly or with
	few enough errors that they can be tolerated.

   ====================================================================== */

class Modulation {

public:
	virtual ~Modulation () {}
	virtual int BitError(double) = 0;	// success reception?

protected:
	int Rs;					// symbol rate per second

private:
	// Probability of 1 bit error
	virtual double ProbBitError(double) = 0;

	// Probability of n bit errors
	virtual double ProbBitError(double, int) = 0;
};


class BPSK : public Modulation {

public:
	BPSK(void);
	BPSK(int);

	virtual ~BPSK () {}

	virtual int BitError(double Pr);

private:
	virtual double ProbBitError(double Pr);
	virtual double ProbBitError(double Pr, int n);
};

#endif /* __modulation_h__ */