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DecoderConvolutional.cpp

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 * This file is part of openWNS (open Wireless Network Simulator)
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 * Chair of Communication Networks (ComNets)
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 * Free Software Foundation;
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 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
 * A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
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#include <RISE/decoder/DecoderConvolutional.hpp>

#include <WNS/Assure.hpp>

#include <cmath>
#include <cassert>
#include <stdexcept>

using namespace std;
using namespace rise;

DecoderConvolutional::~DecoderConvolutional()
{}

DecoderConvolutional::DecoderConvolutional(int k,
                                           int bdfree,
                                           int dfree,
                                           double punctuation) :
    K(k),
    B_dfree(bdfree),
    D_free(dfree),
    Punctuation(punctuation)
{
    assure(B_dfree > 0, "B_dfree must be > 0");
    assure(D_free > 0, "D_free must be > 0");
    assure(K > 0, "K must be > 0");
    assure(Punctuation >= 1.0, "Punctuation must be >= 1");
}

double DecoderConvolutional::getBER(double p_raw)
{
    return getBER(p_raw, Punctuation);
}

double DecoderConvolutional::getBER(double p_raw, double aPuncturingFactor)
{
    assure(p_raw>=0 && p_raw<=0.5, "Raw BER must be in [0, 0.5]");
    double ber = double(B_dfree)/K*pow(2*sqrt(p_raw*(1-p_raw)),
                                       (D_free/aPuncturingFactor));
    if (ber > 0.5)
        ber = 0.5;
    return ber;
}

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