/afs/cern.ch/work/c/cnuttens/private/SiStripDev/DocumentationProduction/CMSSW_6_1_0/src/SimTracker/SiStripDigitizer/plugins/SiGaussianTailNoiseAdder.cc

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#include "SiGaussianTailNoiseAdder.h"
#include "FWCore/ServiceRegistry/interface/Service.h"
#include "FWCore/Utilities/interface/RandomNumberGenerator.h"
#include "CLHEP/Random/RandGaussQ.h"
#include "FWCore/Utilities/interface/Exception.h"

SiGaussianTailNoiseAdder::SiGaussianTailNoiseAdder(float th,CLHEP::HepRandomEngine& eng):
  threshold(th),
  rndEngine(eng),
  gaussDistribution(new CLHEP::RandGaussQ(rndEngine)),
  genNoise(new GaussianTailNoiseGenerator(rndEngine))
{
}

SiGaussianTailNoiseAdder::~SiGaussianTailNoiseAdder(){
}

void SiGaussianTailNoiseAdder::addNoise(std::vector<double> &in,
                                        size_t& minChannel, size_t& maxChannel,
                                        int numStrips, float noiseRMS) const {
 
  std::vector<std::pair<int,float> > generatedNoise;
  genNoise->generate(numStrips,threshold,noiseRMS,generatedNoise);
  
  // noise on strips with signal:
  for (size_t iChannel=minChannel; iChannel<maxChannel; iChannel++) {
    if(in[iChannel] != 0) {
      in[iChannel] += gaussDistribution->fire(0.,noiseRMS);
    }
  }

  // Noise on the other strips
  typedef std::vector<std::pair<int,float> >::const_iterator VI;  
  for(VI p = generatedNoise.begin(); p != generatedNoise.end(); p++){
    if(in[(*p).first] == 0) {
      in[(*p).first] += (*p).second;
    }
  }
}

void SiGaussianTailNoiseAdder::addNoiseVR(std::vector<double> &in, std::vector<float> &noiseRMS) const {
  // Add noise
  // Full Gaussian noise is added everywhere
  for (size_t iChannel=0; iChannel!=in.size(); iChannel++) {
     if(noiseRMS[iChannel] > 0.) in[iChannel] += gaussDistribution->fire(0.,noiseRMS[iChannel]);
  }
}

void SiGaussianTailNoiseAdder::addPedestals(std::vector<double> &in,std::vector<float> & ped) const {
        for (size_t iChannel=0; iChannel!=in.size(); iChannel++) {
      if(ped[iChannel]>0.) in[iChannel] += ped[iChannel];      
    }
}

void SiGaussianTailNoiseAdder::addCMNoise(std::vector<double> &in, float cmnRMS, std::vector<bool> &badChannels) const {
  int nAPVs = in.size()/128;
  std::vector<float> CMNv;
  for(int APVn =0; APVn < nAPVs; ++APVn) CMNv.push_back(gaussDistribution->fire(0.,cmnRMS));
  for (size_t iChannel=0; iChannel!=in.size(); iChannel++) {
     if(!badChannels[iChannel]) in[iChannel] += CMNv[(int)(iChannel/128)];
  }
}

void SiGaussianTailNoiseAdder::addBaselineShift(std::vector<double> &in, std::vector<bool> &badChannels) const {
  size_t nAPVs = in.size()/128;
  std::vector<float> vShift;
  double apvCharge, apvMult;
  
  size_t iChannel;
  for(size_t APVn =0; APVn < nAPVs; ++APVn){
        apvMult=0; apvCharge=0;
        for(iChannel=APVn*128; iChannel!=APVn*128+128; ++iChannel) {
           if(in[iChannel]>0){
                 ++apvMult;
                  apvCharge+= in[iChannel];
           }
           if(apvMult==0) vShift.push_back(0);
           else vShift.push_back(apvCharge/apvMult);
        }
  }
     
  for (iChannel=0; iChannel!=in.size(); ++iChannel) {
     if(!badChannels[iChannel]) in[iChannel] -= vShift[(int)(iChannel/128)];
  }
}