SINR calculation

Luca Tartarini

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Nov 19, 2015, 1:05:00 PM11/19/15

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Hi everyone,

I was wondering how the SINR is calculated in the InterferenceHelper class: https://www.nsnam.org/doxygen/interference-helper_8cc_source.html#l00237

In particular, how is generated the argument "noiseInterference" in the following method:

  236 double

  237 InterferenceHelper::CalculateSnr (double signal, double noiseInterference, uint32_t channelWidth) const

  238 {

  239   //thermal noise at 290K in J/s = W

  240   static const double BOLTZMANN = 1.3803e-23;

  241   //Nt is the power of thermal noise in W

  242   double Nt = BOLTZMANN * 290.0 * channelWidth * 1000000;

  243   //receiver noise Floor (W) which accounts for thermal noise and non-idealities of the receiver

  244   double noiseFloor = m_noiseFigure * Nt;

  245   double noise = noiseFloor + noiseInterference;

  246   double snr = signal / noise; //linear scale

  247   NS_LOG_DEBUG ("bandwidth(MHz)=" << channelWidth << ", signal(W)= " << signal << ", noise(W)=" << noiseFloor << ", interference(W)=" << noiseInterference << ", snr(linear)=" << snr);

  248   return snr;

  249 }

Cheers,

Luca Tartarini

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Nov 19, 2015, 1:15:04 PM11/19/15

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Did you check interference-helper.cc?

You will see there how it gets calculated.

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Luca Tartarini

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Nov 23, 2015, 2:48:12 PM11/23/15

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Dear Sebastien,

Thanks for the reply, actually that piece of code is inside the interference-helper.cc but I stil can not understand how the arguments is the CalculateSnr function are retrieved.