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minor implementation refinements for LteMiErrorModel

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This commit is contained in:
Nicola Baldo
2012-01-27 17:52:58 +01:00
parent 4a5dd3a7de
commit 4e4c7fd90c
2 changed files with 12 additions and 28 deletions
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32
src/lte/model/lte-mi-error-model.cc
View File

@@ -202,22 +202,10 @@ double cEcrTable [9][27] = {
};
LteMiErrorModel::LteMiErrorModel (void)
{
//NS_LOG_FUNCTION (this);
}
LteMiErrorModel::~LteMiErrorModel (void)
{
}
double
LteMiErrorModel::Mib (SpectrumValue& sinr, std::vector<int> map, uint8_t mcs)
LteMiErrorModel::Mib (SpectrumValue& sinr, const std::vector<int>& map, uint8_t mcs)
{
NS_LOG_FUNCTION_NOARGS ();
NS_LOG_FUNCTION (sinr << &map << (uint32_t) mcs);
double MI;
double MIsum = 0.0;
@@ -281,11 +269,11 @@ LteMiErrorModel::Mib (SpectrumValue& sinr, std::vector<int> map, uint8_t mcs)
}
}
}
NS_LOG_FUNCTION (" RB " << map.at (i) << "Minimum SNR = " << sinr_db << " dB, MCS = " << (uint16_t)mcs << ", MI = " << MI);
NS_LOG_LOGIC (" RB " << map.at (i) << "Minimum SNR = " << sinr_db << " dB, MCS = " << (uint16_t)mcs << ", MI = " << MI);
MIsum += MI;
}
MI = MIsum / map.size ();
NS_LOG_FUNCTION (" MI = " << MI);
NS_LOG_LOGIC (" MI = " << MI);
return MI;
}
@@ -293,7 +281,7 @@ LteMiErrorModel::Mib (SpectrumValue& sinr, std::vector<int> map, uint8_t mcs)
double
LteMiErrorModel::MappingMiBler (double mib, uint8_t mcs, uint16_t cbSize)
{
//NS_LOG_FUNCTION (this);
NS_LOG_FUNCTION (mib << (uint32_t) mcs << (uint32_t) cbSize);
double b = 0;
double c = 0;
NS_ASSERT_MSG (mcs>=0 && mcs < 32, "MCS out of range");
@@ -304,7 +292,7 @@ LteMiErrorModel::MappingMiBler (double mib, uint8_t mcs, uint16_t cbSize)
cbIndex++;
}
cbIndex--;
NS_LOG_FUNCTION (" MCS " << (uint16_t)mcs << " TBS " << tbsIndex << " CB size " << cbSize << " CB size curve " << cbMiSizeTable[cbIndex]);
NS_LOG_LOGIC (" MCS " << (uint16_t)mcs << " TBS " << tbsIndex << " CB size " << cbSize << " CB size curve " << cbMiSizeTable[cbIndex]);
b = bEcrTable[cbIndex][tbsIndex];
if (b<0.0)
@@ -330,15 +318,15 @@ LteMiErrorModel::MappingMiBler (double mib, uint8_t mcs, uint16_t cbSize)
}
// see IEEE802.16m EMD formula 55 of section 4.3.2.1
double bler = 0.5*( 1 - erf((mib-b)/(sqrt(2)*c)) );
NS_LOG_FUNCTION ("MIB: " << mib << " BLER:" << bler);
NS_LOG_LOGIC ("MIB: " << mib << " BLER:" << bler);
return bler;
}
double
LteMiErrorModel::GetTbError (SpectrumValue& sinr, std::vector<int> map, uint16_t size, uint8_t mcs)
LteMiErrorModel::GetTbError (SpectrumValue& sinr, const std::vector<int>& map, uint16_t size, uint8_t mcs)
{
NS_LOG_FUNCTION_NOARGS ();
NS_LOG_FUNCTION (sinr << &map << (uint32_t) size << (uint32_t) mcs);
double MI = Mib(sinr, map, mcs);
// estimate CB size (according to sec 5.1.2 of TS 36.212)
@@ -452,7 +440,7 @@ LteMiErrorModel::GetTbError (SpectrumValue& sinr, std::vector<int> map, uint16_t
errorRate = MappingMiBler (MI, mcs, Kplus);
}
NS_LOG_FUNCTION (" Error rate " << errorRate);
NS_LOG_LOGIC (" Error rate " << errorRate);
return errorRate;
}

8
src/lte/model/lte-mi-error-model.h
View File

@@ -50,10 +50,6 @@ class LteMiErrorModel
public:
LteMiErrorModel (void);
~LteMiErrorModel (void);
/**
* \brief find the mmib (mean mutual information per bit) for different modulations of the specified TB
* \param sinr the perceived sinrs in the whole bandwidth
@@ -61,7 +57,7 @@ public:
* \param cms the MCS of the TB
* \return the mmib
*/
static double Mib (SpectrumValue& sinr, std::vector<int> map, uint8_t mcs);
static double Mib (SpectrumValue& sinr, const std::vector<int>& map, uint8_t mcs);
/**
* \brief map the mmib (mean mutual information per bit) for different MCS
* \param mmib mean mutual information per bit of a code-block
@@ -76,7 +72,7 @@ public:
* \param modulation the modulations (qpsk, 16-qam, 64-qam)
* \param code block-size and code-rate
*/
static double GetTbError (SpectrumValue& sinr, std::vector<int> map, uint16_t size, uint8_t mcs);
static double GetTbError (SpectrumValue& sinr, const std::vector<int>& map, uint16_t size, uint8_t mcs);
//private: