constant-spectrum-propagation-loss.cc

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/*
 * Copyright (c) 2011 Centre Tecnologic de Telecomunicacions de Catalunya (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: Manuel Requena <manuel.requena@cttc.es>
 */
 
#include "ns3/constant-spectrum-propagation-loss.h"
 
#include "spectrum-signal-parameters.h"
 
#include "ns3/double.h"
#include "ns3/log.h"
 
#include <cmath>
 
namespace ns3
{
 
NS_LOG_COMPONENT_DEFINE("ConstantSpectrumPropagationLossModel");
 
NS_OBJECT_ENSURE_REGISTERED(ConstantSpectrumPropagationLossModel);
 
ConstantSpectrumPropagationLossModel::ConstantSpectrumPropagationLossModel()
{
    NS_LOG_FUNCTION(this);
}
 
ConstantSpectrumPropagationLossModel::~ConstantSpectrumPropagationLossModel()
{
    NS_LOG_FUNCTION(this);
}
 
TypeId
ConstantSpectrumPropagationLossModel::GetTypeId()
{
    static TypeId tid =
        TypeId("ns3::ConstantSpectrumPropagationLossModel")
            .SetParent<SpectrumPropagationLossModel>()
            .SetGroupName("Spectrum")
            .AddConstructor<ConstantSpectrumPropagationLossModel>()
            .AddAttribute("Loss",
                          "Path loss (dB) between transmitter and receiver",
                          DoubleValue(1.0),
                          MakeDoubleAccessor(&ConstantSpectrumPropagationLossModel::SetLossDb,
                                             &ConstantSpectrumPropagationLossModel::GetLossDb),
                          MakeDoubleChecker<double>());
    return tid;
}
 
void
ConstantSpectrumPropagationLossModel::SetLossDb(double lossDb)
{
    NS_LOG_FUNCTION(this);
    m_lossDb = lossDb;
    m_lossLinear = std::pow(10, m_lossDb / 10);
}
 
double
ConstantSpectrumPropagationLossModel::GetLossDb() const
{
    NS_LOG_FUNCTION(this);
    return m_lossDb;
}
 
Ptr<SpectrumValue>
ConstantSpectrumPropagationLossModel::DoCalcRxPowerSpectralDensity(
    Ptr<const SpectrumSignalParameters> params,
    Ptr<const MobilityModel> a,
    Ptr<const MobilityModel> b) const
{
    NS_LOG_FUNCTION(this);
 
    Ptr<SpectrumValue> rxPsd = Copy<SpectrumValue>(params->psd);
    Values::iterator vit = rxPsd->ValuesBegin();
    Bands::const_iterator fit = rxPsd->ConstBandsBegin();
 
    while (vit != rxPsd->ValuesEnd())
    {
        NS_ASSERT(fit != rxPsd->ConstBandsEnd());
        NS_LOG_LOGIC("Ptx = " << *vit);
        *vit /= m_lossLinear; // Prx = Ptx / loss
        NS_LOG_LOGIC("Prx = " << *vit);
        ++vit;
        ++fit;
    }
    return rxPsd;
}
 
} // namespace ns3