modulation.cc

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/*
 * Copyright (c) 1997 Regents of the University of California.
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 *  This product includes software developed by the Computer Systems
 *  Engineering Group at Lawrence Berkeley Laboratory.
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/* Ported from CMU/Monarch's code, nov'98 -Padma.*/

#include <math.h>
#include <stdlib.h>
#include <random.h>
//#include <debug.h>
#include <modulation.h>

/* ======================================================================
   Binary Phase Shift Keying
   ====================================================================== */
BPSK::BPSK()
{
    Rs = 0;
}

BPSK::BPSK(int S)
{
    Rs = S;
}

int
BPSK::BitError(double Pr)
{
    double Pe;          // probability of error
    double x;
    int nbit = 0;           // number of bit errors tolerated

    if(nbit == 0) {
        Pe = ProbBitError(Pr);
    }
    else {
        Pe = ProbBitError(Pr, nbit);
    }

    // quick check
    if(Pe == 0.0)
        return 0;       // no bit errors

    // scale the error probabilty
    Pe *= 1e3;

    x = (double)(((int)Random::uniform()) % 1000);

    if(x < Pe)
        return 1;       // bit error
    else
        return 0;       // no bit errors
}

double
BPSK::ProbBitError(double)
{
    double Pe = 0.0;

    return Pe;
}

double
BPSK::ProbBitError(double, int)
{
    double Pe = 0.0;

    return Pe;
}

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