spectrum-error-model.cc

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/*
 * Copyright (c) 2009 CTTC
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation;
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Author: Nicola Baldo <nbaldo@cttc.es>
 */
 
#include "spectrum-error-model.h"
 
#include <ns3/log.h>
#include <ns3/nstime.h>
 
namespace ns3
{
 
NS_LOG_COMPONENT_DEFINE("ShannonSpectrumErrorModel");
 
NS_OBJECT_ENSURE_REGISTERED(SpectrumErrorModel);
 
TypeId
SpectrumErrorModel::GetTypeId()
{
    static TypeId tid =
        TypeId("ns3::SpectrumErrorModel").SetParent<Object>().SetGroupName("Spectrum")
        // No AddConstructor because this is an abstract class.
        ;
    return tid;
}
 
SpectrumErrorModel::~SpectrumErrorModel()
{
}
 
NS_OBJECT_ENSURE_REGISTERED(ShannonSpectrumErrorModel);
 
/* static */
TypeId
ShannonSpectrumErrorModel::GetTypeId()
{
    static TypeId tid = TypeId("ns3::ShannonSpectrumErrorModel")
                            .SetParent<SpectrumErrorModel>()
                            .SetGroupName("Spectrum")
                            .AddConstructor<ShannonSpectrumErrorModel>();
    return tid;
}
 
void
ShannonSpectrumErrorModel::DoDispose()
{
    NS_LOG_FUNCTION(this);
    SpectrumErrorModel::DoDispose();
}
 
void
ShannonSpectrumErrorModel::StartRx(Ptr<const Packet> p)
{
    NS_LOG_FUNCTION(this);
    m_bytes = p->GetSize();
    NS_LOG_LOGIC("bytes to deliver: " << m_bytes);
    m_deliverableBytes = 0;
}
 
void
ShannonSpectrumErrorModel::EvaluateChunk(const SpectrumValue& sinr, Time duration)
{
    NS_LOG_FUNCTION(this << sinr << duration);
    SpectrumValue CapacityPerHertz = Log2(1 + sinr);
    double capacity = 0;
 
    Bands::const_iterator bi = CapacityPerHertz.ConstBandsBegin();
    Values::const_iterator vi = CapacityPerHertz.ConstValuesBegin();
 
    while (bi != CapacityPerHertz.ConstBandsEnd())
    {
        NS_ASSERT(vi != CapacityPerHertz.ConstValuesEnd());
        capacity += (bi->fh - bi->fl) * (*vi);
        ++bi;
        ++vi;
    }
    NS_ASSERT(vi == CapacityPerHertz.ConstValuesEnd());
    NS_LOG_LOGIC("ChunkCapacity = " << capacity);
    m_deliverableBytes += static_cast<uint32_t>(capacity * duration.GetSeconds() / 8);
    NS_LOG_LOGIC("DeliverableBytes = " << m_deliverableBytes);
}
 
bool
ShannonSpectrumErrorModel::IsRxCorrect()
{
    NS_LOG_FUNCTION(this);
    return (m_deliverableBytes > m_bytes);
}
 
} // namespace ns3