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wifi: Add helper function to convert HE RU indexes to Spectrum model indexes

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This commit is contained in:
Sébastien Deronne
2019-06-25 20:49:37 +02:00
parent cd1a6dd457
commit d2546e47db
2 changed files with 39 additions and 0 deletions
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29
src/wifi/model/spectrum-wifi-phy.cc
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@@ -482,4 +482,33 @@ SpectrumWifiPhy::GetBand (uint16_t bandWidth, uint8_t bandIndex)
return band;
}
WifiSpectrumBand
SpectrumWifiPhy::ConvertHeRuIndices (uint16_t channelWidth, HeRu::SubcarrierRange range) const
{
WifiSpectrumBand convertedIndices;
uint32_t nGuardBands = static_cast<uint32_t> (((2 * GetGuardBandwidth (channelWidth) * 1e6) / GetBandBandwidth ()) + 0.5);
uint32_t centerFrequencyIndex = 0;
switch (channelWidth)
{
case 20:
centerFrequencyIndex = (nGuardBands / 2) + 6 + 122;
break;
case 40:
centerFrequencyIndex = (nGuardBands / 2) + 12 + 244;
break;
case 80:
centerFrequencyIndex = (nGuardBands / 2) + 12 + 500;
break;
case 160:
centerFrequencyIndex = (nGuardBands / 2) + 12 + 1012;
break;
default:
NS_FATAL_ERROR ("ChannelWidth " << channelWidth << " unsupported");
break;
}
convertedIndices.first = centerFrequencyIndex + range.first;
convertedIndices.second = centerFrequencyIndex + range.second;
return convertedIndices;
}
} //namespace ns3

10
src/wifi/model/spectrum-wifi-phy.h
View File

@@ -29,6 +29,7 @@
#include "ns3/antenna-model.h"
#include "ns3/spectrum-channel.h"
#include "ns3/spectrum-model.h"
#include "ns3/wifi-spectrum-value-helper.h"
#include "wifi-phy.h"
namespace ns3 {
@@ -188,6 +189,15 @@ private:
*/
Ptr<SpectrumValue> GetTxPowerSpectralDensity (uint16_t centerFrequency, uint16_t channelWidth, double txPowerW, WifiModulationClass modulationClass) const;
/**
* \param channelWidth the total channel width (MHz) used for the OFDMA transmission
* \param range the subcarrier range of the HE RU
* \return the converted indices
*
* This is a helper function to convert HE RU indices, which are relative to the center frequency subcarrier, to the indices used by the Spectrum model.
*/
WifiSpectrumBand ConvertHeRuIndices (uint16_t channelWidth, HeRu::SubcarrierRange range) const;
/**
* Perform run-time spectrum model change
*/