wireless_channel.cpp

RFID reader 语 tag 模拟器

 #include "wireless_channel.hpp"
 #include "path_loss.hpp"
 #include "fading.hpp"
 #include "wireless_comm_signal.hpp"
 #include "log_stream_manager.hpp"
 #include "physical_layer.hpp"

 WirelessChannel::WirelessChannel(PathLossPtr pathLossModel)
 {
    assert(pathLossModel.get() != 0);
    m_pathLossModel = pathLossModel;
 }

 WirelessChannel::WirelessChannel(PathLossPtr pathLossModel,
    FadingPtr fadingModel)
 {
    assert(pathLossModel.get() != 0);
    assert(fadingModel.get() != 0);
    m_pathLossModel = pathLossModel;
    m_fadingModel = fadingModel;
 }

 double WirelessChannel::getRecvdStrength(const WirelessCommSignal& signal,
    const PhysicalLayer& receiver) const
 {
    assert(m_pathLossModel.get() != 0);
    double recvdStrength =
       m_pathLossModel->getRecvdStrength(signal, receiver);

    double debugRecvdStrength = recvdStrength;

    // Account for fading if such a model exists
    if(m_fadingModel.get() != 0) {
       recvdStrength *= m_fadingModel->fadingFactor(signal,
          receiver.getNodeId());
    }

    if(m_DEBUG_SIGNAL_STRENGTH) {
       ostringstream debugStream;
       debugStream << __FUNCTION__ << " recvStrength1: " <<
          debugRecvdStrength;
       debugStream << " recvStrength2: " << recvdStrength;
       LogStreamManager::instance()->logDebugItem(debugStream.str());
    }

    return recvdStrength;
 }

 bool WirelessChannel::signalHasError(double signalSinr,
    const WirelessCommSignal& signal) const
 {
    // This is just a placeholder function for now.
    // In the future, there should be a PacketLoss object
    // contained in WirelessChannel that computes this
    // based on some model.
    return false;
 }