|
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#include "ns3/log.h" |
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#include "ns3/log.h" |
26 |
#include <algorithm> |
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#include <algorithm> |
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|
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|
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|
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using TimeInterval = boost::icl::interval<ns3::Time>; |
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|
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namespace ns3 { |
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namespace ns3 { |
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|
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|
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NS_LOG_COMPONENT_DEFINE ("InterferenceHelper"); |
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NS_LOG_COMPONENT_DEFINE ("InterferenceHelper"); |
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|
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|
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/**************************************************************** |
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/**************************************************************** |
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* Class which records SNIR change events for a |
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|
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* short period of time. |
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****************************************************************/ |
90 |
|
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InterferenceHelper::NiChange::NiChange (double power, Ptr<InterferenceHelper::Event> event) |
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: m_power (power), |
93 |
m_event (event) |
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{ |
95 |
} |
96 |
|
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double |
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InterferenceHelper::NiChange::GetPower (void) const |
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{ |
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return m_power; |
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} |
102 |
|
103 |
void |
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InterferenceHelper::NiChange::AddPower (double power) |
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{ |
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m_power += power; |
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} |
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|
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Ptr<InterferenceHelper::Event> |
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InterferenceHelper::NiChange::GetEvent (void) const |
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{ |
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return m_event; |
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} |
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|
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|
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/**************************************************************** |
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* The actual InterferenceHelper |
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* The actual InterferenceHelper |
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****************************************************************/ |
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****************************************************************/ |
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|
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|
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InterferenceHelper::InterferenceHelper () |
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InterferenceHelper::InterferenceHelper () |
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: m_errorRateModel (0), |
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: m_errorRateModel (0), |
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m_numRxAntennas (1), |
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m_numRxAntennas (1), |
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m_firstPower (0), |
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|
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m_rxing (false) |
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m_rxing (false) |
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{ |
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{ |
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// Always have a zero power noise event in the list |
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|
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AddNiChangeEvent (Time (0), NiChange (0.0, 0)); |
128 |
} |
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} |
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|
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|
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InterferenceHelper::~InterferenceHelper () |
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InterferenceHelper::~InterferenceHelper () |
|
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Time |
153 |
Time |
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InterferenceHelper::GetEnergyDuration (double energyW) const |
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InterferenceHelper::GetEnergyDuration (double energyW) const |
186 |
{ |
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{ |
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Time now = Simulator::Now (); |
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const Time now = Simulator::Now (); |
188 |
auto i = GetPreviousPosition (now); |
157 |
|
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Time end = i->first; |
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Time last = Time::Min(); |
190 |
for (; i != m_niChanges.end (); ++i) |
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|
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|
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for (auto i = m_niChanges.find(now), end = m_niChanges.end (); i != end; ++i) |
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{ |
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{ |
192 |
double noiseInterferenceW = i->second.GetPower (); |
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double noiseInterferenceW = i->second; |
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end = i->first; |
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last = i->first.upper(); |
194 |
if (noiseInterferenceW < energyW) |
164 |
if (noiseInterferenceW < energyW) |
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{ |
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{ |
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break; |
166 |
break; |
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} |
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} |
198 |
} |
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} |
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return end > now ? end - now : MicroSeconds (0); |
169 |
return last > now ? last - now : MicroSeconds (0); |
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} |
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} |
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|
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|
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void |
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void |
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InterferenceHelper::AppendEvent (Ptr<InterferenceHelper::Event> event) |
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InterferenceHelper::AppendEvent (Ptr<InterferenceHelper::Event> event) |
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{ |
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{ |
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NS_LOG_FUNCTION (this); |
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NS_LOG_FUNCTION (this); |
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double previousPowerStart = 0; |
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double previousPowerEnd = 0; |
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previousPowerStart = GetPreviousPosition (event->GetStartTime ())->second.GetPower (); |
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previousPowerEnd = GetPreviousPosition (event->GetEndTime ())->second.GetPower (); |
210 |
|
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|
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if (!m_rxing) |
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if (!m_rxing) |
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{ |
178 |
{ |
213 |
m_firstPower = previousPowerStart; |
179 |
// Remove all events before this event, do not include the start time |
214 |
// Always leave the first zero power noise event in the list |
180 |
m_niChanges -= TimeInterval::right_open(Seconds(0), event->GetStartTime ()); |
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m_niChanges.erase (++(m_niChanges.begin ()), |
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|
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GetNextPosition (event->GetStartTime ())); |
217 |
} |
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} |
218 |
auto first = AddNiChangeEvent (event->GetStartTime (), NiChange (previousPowerStart, event)); |
182 |
|
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auto last = AddNiChangeEvent (event->GetEndTime (), NiChange (previousPowerEnd, event)); |
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auto inter = TimeInterval::closed(event->GetStartTime (), event->GetEndTime ()); |
220 |
for (auto i = first; i != last; ++i) |
184 |
|
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{ |
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m_niChanges += std::make_pair(inter, event->GetRxPowerW()); |
222 |
i->second.AddPower (event->GetRxPowerW ()); |
186 |
|
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} |
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/*std::cout << inter << " " << event->GetRxPowerW() << std::endl; |
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|
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//std::cout << m_niChanges.size() << std::endl; |
189 |
for (auto i = m_niChanges.begin(), end = m_niChanges.end(); i != end; ++i) |
190 |
{ |
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std::cout << i->first << " " << i->second << std::endl; |
192 |
} |
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std::cout << std::endl;*/ |
224 |
} |
194 |
} |
225 |
|
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|
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double |
196 |
double |
|
239 |
} |
209 |
} |
240 |
|
210 |
|
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double |
211 |
double |
242 |
InterferenceHelper::CalculateNoiseInterferenceW (Ptr<InterferenceHelper::Event> event, NiChanges *ni) const |
212 |
InterferenceHelper::CalculateNoiseInterferenceW (Ptr<InterferenceHelper::Event> event, NiChangesRange *ni) const |
243 |
{ |
213 |
{ |
244 |
double noiseInterference = m_firstPower; |
214 |
// Get all the powers between this event's start and end time inclusive |
245 |
auto it = m_niChanges.find (event->GetStartTime ()); |
215 |
*ni = m_niChanges.equal_range(TimeInterval::closed(event->GetStartTime (), event->GetEndTime())); |
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|
216 |
|
217 |
/*auto it = m_niChanges.find (event->GetStartTime ()); |
246 |
for (; it != m_niChanges.end () && it->second.GetEvent () != event; ++it) |
218 |
for (; it != m_niChanges.end () && it->second.GetEvent () != event; ++it) |
247 |
{ |
219 |
{ |
248 |
noiseInterference = it->second.GetPower (); |
220 |
noiseInterference = it->second.GetPower (); |
|
252 |
{ |
224 |
{ |
253 |
ni->insert (*it); |
225 |
ni->insert (*it); |
254 |
} |
226 |
} |
255 |
ni->emplace (event->GetEndTime (), NiChange (0, event)); |
227 |
ni->emplace (event->GetEndTime (), NiChange (0, event));*/ |
256 |
return noiseInterference; |
228 |
|
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|
229 |
// If there are no events, then there is no interference |
230 |
return ni->first == ni->second ? 0 : ni->first->second - event->GetRxPowerW (); |
257 |
} |
231 |
} |
258 |
|
232 |
|
259 |
double |
233 |
double |
|
279 |
} |
253 |
} |
280 |
|
254 |
|
281 |
double |
255 |
double |
282 |
InterferenceHelper::CalculatePlcpPayloadPer (Ptr<const InterferenceHelper::Event> event, NiChanges *ni) const |
256 |
InterferenceHelper::CalculatePlcpPayloadPer (Ptr<const InterferenceHelper::Event> event, const NiChangesRange& ni) const |
283 |
{ |
257 |
{ |
284 |
NS_LOG_FUNCTION (this); |
258 |
NS_LOG_FUNCTION (this); |
285 |
const WifiTxVector txVector = event->GetTxVector (); |
259 |
const WifiTxVector txVector = event->GetTxVector (); |
|
|
260 |
const double powerW = event->GetRxPowerW (); |
261 |
|
286 |
double psr = 1.0; /* Packet Success Rate */ |
262 |
double psr = 1.0; /* Packet Success Rate */ |
287 |
auto j = ni->begin (); |
263 |
|
288 |
Time previous = j->first; |
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|
289 |
WifiMode payloadMode = event->GetPayloadMode (); |
264 |
WifiMode payloadMode = event->GetPayloadMode (); |
290 |
WifiPreamble preamble = txVector.GetPreambleType (); |
265 |
WifiPreamble preamble = txVector.GetPreambleType (); |
291 |
Time plcpHeaderStart = j->first + WifiPhy::GetPlcpPreambleDuration (txVector); //packet start time + preamble |
266 |
Time plcpHeaderStart = event->GetStartTime() + WifiPhy::GetPlcpPreambleDuration (txVector); //packet start time + preamble |
292 |
Time plcpHsigHeaderStart = plcpHeaderStart + WifiPhy::GetPlcpHeaderDuration (txVector); //packet start time + preamble + L-SIG |
267 |
Time plcpHsigHeaderStart = plcpHeaderStart + WifiPhy::GetPlcpHeaderDuration (txVector); //packet start time + preamble + L-SIG |
293 |
Time plcpTrainingSymbolsStart = plcpHsigHeaderStart + WifiPhy::GetPlcpHtSigHeaderDuration (preamble) + WifiPhy::GetPlcpSigA1Duration (preamble) + WifiPhy::GetPlcpSigA2Duration (preamble); //packet start time + preamble + L-SIG + HT-SIG or SIG-A |
268 |
Time plcpTrainingSymbolsStart = plcpHsigHeaderStart + WifiPhy::GetPlcpHtSigHeaderDuration (preamble) + WifiPhy::GetPlcpSigA1Duration (preamble) + WifiPhy::GetPlcpSigA2Duration (preamble); //packet start time + preamble + L-SIG + HT-SIG or SIG-A |
294 |
Time plcpPayloadStart = plcpTrainingSymbolsStart + WifiPhy::GetPlcpTrainingSymbolDuration (txVector) + WifiPhy::GetPlcpSigBDuration (preamble); //packet start time + preamble + L-SIG + HT-SIG or SIG-A + Training + SIG-B |
269 |
Time plcpPayloadStart = plcpTrainingSymbolsStart + WifiPhy::GetPlcpTrainingSymbolDuration (txVector) + WifiPhy::GetPlcpSigBDuration (preamble); //packet start time + preamble + L-SIG + HT-SIG or SIG-A + Training + SIG-B |
295 |
double noiseInterferenceW = m_firstPower; |
270 |
|
296 |
double powerW = event->GetRxPowerW (); |
271 |
for (auto j = ni.first, end = ni.second; j != end; ++j) |
297 |
while (++j != ni->end ()) |
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|
298 |
{ |
272 |
{ |
299 |
Time current = j->first; |
273 |
const Time startt = j->first.lower(); |
300 |
NS_LOG_DEBUG ("previous= " << previous << ", current=" << current); |
274 |
const Time endt = j->first.upper(); |
301 |
NS_ASSERT (current >= previous); |
275 |
|
302 |
//Case 1: Both previous and current point to the payload |
276 |
const double noiseInterferenceW = j->second - powerW; |
303 |
if (previous >= plcpPayloadStart) |
277 |
|
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|
278 |
NS_LOG_DEBUG ("startt= " << startt << ", endt=" << endt << ", noiseInterferenceW=" << noiseInterferenceW); |
279 |
|
280 |
//Case 1: This interval is after the payload has started |
281 |
if (startt >= plcpPayloadStart) |
304 |
{ |
282 |
{ |
305 |
psr *= CalculateChunkSuccessRate (CalculateSnr (powerW, |
283 |
psr *= CalculateChunkSuccessRate (CalculateSnr (powerW, |
306 |
noiseInterferenceW, |
284 |
noiseInterferenceW, |
307 |
txVector.GetChannelWidth ()), |
285 |
txVector.GetChannelWidth ()), |
308 |
current - previous, |
286 |
endt - startt, |
309 |
payloadMode, txVector); |
287 |
payloadMode, txVector); |
310 |
NS_LOG_DEBUG ("Both previous and current point to the payload: mode=" << payloadMode << ", psr=" << psr); |
288 |
NS_LOG_DEBUG ("Both previous and current point to the payload: mode=" << payloadMode << ", psr=" << psr); |
311 |
} |
289 |
} |
312 |
//Case 2: previous is before payload and current is in the payload |
290 |
//Case 2: This interval starts before the payload, but it does include it |
313 |
else if (current >= plcpPayloadStart) |
291 |
else if (startt < plcpPayloadStart && plcpPayloadStart <= endt) |
314 |
{ |
292 |
{ |
315 |
psr *= CalculateChunkSuccessRate (CalculateSnr (powerW, |
293 |
psr *= CalculateChunkSuccessRate (CalculateSnr (powerW, |
316 |
noiseInterferenceW, |
294 |
noiseInterferenceW, |
317 |
txVector.GetChannelWidth ()), |
295 |
txVector.GetChannelWidth ()), |
318 |
current - plcpPayloadStart, |
296 |
endt - plcpPayloadStart, |
319 |
payloadMode, txVector); |
297 |
payloadMode, txVector); |
320 |
NS_LOG_DEBUG ("previous is before payload and current is in the payload: mode=" << payloadMode << ", psr=" << psr); |
298 |
NS_LOG_DEBUG ("previous is before payload and current is in the payload: mode=" << payloadMode << ", psr=" << psr); |
321 |
} |
299 |
} |
322 |
noiseInterferenceW = j->second.GetPower () - powerW; |
|
|
323 |
previous = j->first; |
324 |
} |
300 |
} |
325 |
double per = 1 - psr; |
301 |
double per = 1 - psr; |
326 |
return per; |
302 |
return per; |
327 |
} |
303 |
} |
328 |
|
304 |
|
329 |
double |
305 |
double |
330 |
InterferenceHelper::CalculatePlcpHeaderPer (Ptr<const InterferenceHelper::Event> event, NiChanges *ni) const |
306 |
InterferenceHelper::CalculatePlcpHeaderPer (Ptr<const InterferenceHelper::Event> event, const NiChangesRange& ni) const |
331 |
{ |
307 |
{ |
332 |
NS_LOG_FUNCTION (this); |
308 |
NS_LOG_FUNCTION (this); |
333 |
const WifiTxVector txVector = event->GetTxVector (); |
309 |
const WifiTxVector txVector = event->GetTxVector (); |
|
|
310 |
const double powerW = event->GetRxPowerW (); |
311 |
|
334 |
double psr = 1.0; /* Packet Success Rate */ |
312 |
double psr = 1.0; /* Packet Success Rate */ |
335 |
auto j = ni->begin (); |
313 |
|
336 |
Time previous = j->first; |
|
|
337 |
WifiPreamble preamble = txVector.GetPreambleType (); |
314 |
WifiPreamble preamble = txVector.GetPreambleType (); |
338 |
WifiMode mcsHeaderMode; |
315 |
WifiMode mcsHeaderMode; |
339 |
if (preamble == WIFI_PREAMBLE_HT_MF || preamble == WIFI_PREAMBLE_HT_GF) |
316 |
if (preamble == WIFI_PREAMBLE_HT_MF || preamble == WIFI_PREAMBLE_HT_GF) |
|
352 |
mcsHeaderMode = WifiPhy::GetHePlcpHeaderMode (); |
329 |
mcsHeaderMode = WifiPhy::GetHePlcpHeaderMode (); |
353 |
} |
330 |
} |
354 |
WifiMode headerMode = WifiPhy::GetPlcpHeaderMode (txVector); |
331 |
WifiMode headerMode = WifiPhy::GetPlcpHeaderMode (txVector); |
355 |
Time plcpHeaderStart = j->first + WifiPhy::GetPlcpPreambleDuration (txVector); //packet start time + preamble |
332 |
Time plcpHeaderStart = event->GetStartTime() + WifiPhy::GetPlcpPreambleDuration (txVector); //packet start time + preamble |
356 |
Time plcpHsigHeaderStart = plcpHeaderStart + WifiPhy::GetPlcpHeaderDuration (txVector); //packet start time + preamble + L-SIG |
333 |
Time plcpHsigHeaderStart = plcpHeaderStart + WifiPhy::GetPlcpHeaderDuration (txVector); //packet start time + preamble + L-SIG |
357 |
Time plcpTrainingSymbolsStart = plcpHsigHeaderStart + WifiPhy::GetPlcpHtSigHeaderDuration (preamble) + WifiPhy::GetPlcpSigA1Duration (preamble) + WifiPhy::GetPlcpSigA2Duration (preamble); //packet start time + preamble + L-SIG + HT-SIG or SIG-A |
334 |
Time plcpTrainingSymbolsStart = plcpHsigHeaderStart + WifiPhy::GetPlcpHtSigHeaderDuration (preamble) + WifiPhy::GetPlcpSigA1Duration (preamble) + WifiPhy::GetPlcpSigA2Duration (preamble); //packet start time + preamble + L-SIG + HT-SIG or SIG-A |
358 |
Time plcpPayloadStart = plcpTrainingSymbolsStart + WifiPhy::GetPlcpTrainingSymbolDuration (txVector) + WifiPhy::GetPlcpSigBDuration (preamble); //packet start time + preamble + L-SIG + HT-SIG or SIG-A + Training + SIG-B |
335 |
Time plcpPayloadStart = plcpTrainingSymbolsStart + WifiPhy::GetPlcpTrainingSymbolDuration (txVector) + WifiPhy::GetPlcpSigBDuration (preamble); //packet start time + preamble + L-SIG + HT-SIG or SIG-A + Training + SIG-B |
359 |
double noiseInterferenceW = m_firstPower; |
336 |
|
360 |
double powerW = event->GetRxPowerW (); |
337 |
for (auto j = ni.first, end = ni.second; j != end; ++j) |
361 |
while (++j != ni->end ()) |
|
|
362 |
{ |
338 |
{ |
363 |
Time current = j->first; |
339 |
const Time startt = j->first.lower(); |
364 |
NS_LOG_DEBUG ("previous= " << previous << ", current=" << current); |
340 |
const Time endt = j->first.upper(); |
365 |
NS_ASSERT (current >= previous); |
341 |
|
366 |
//Case 1: previous and current after playload start: nothing to do |
342 |
const double noiseInterferenceW = j->second - powerW; |
367 |
if (previous >= plcpPayloadStart) |
343 |
|
|
|
344 |
NS_LOG_DEBUG ("startt= " << startt << ", endt=" << endt << ", noiseInterferenceW=" << noiseInterferenceW); |
345 |
|
346 |
//Case 1: interval after playload start: nothing to do |
347 |
if (startt >= plcpPayloadStart && endt >= plcpPayloadStart) |
368 |
{ |
348 |
{ |
369 |
psr *= 1; |
349 |
//psr *= 1; |
370 |
NS_LOG_DEBUG ("Case 1 - previous and current after playload start: nothing to do"); |
350 |
NS_LOG_DEBUG ("Case 1 - interval after playload start: nothing to do"); |
371 |
} |
351 |
} |
372 |
//Case 2: previous is in training or in SIG-B: legacy will not enter here since it didn't enter in the last two and they are all the same for legacy |
352 |
//Case 2: previous is in training or in SIG-B: legacy will not enter here since it didn't enter in the last two and they are all the same for legacy |
373 |
else if (previous >= plcpTrainingSymbolsStart) |
353 |
else if (previous >= plcpTrainingSymbolsStart) |
|
732 |
NS_LOG_DEBUG ("Case 5d - previous is in the preamble and current is in L-SIG: mode=" << headerMode << ", psr=" << psr); |
712 |
NS_LOG_DEBUG ("Case 5d - previous is in the preamble and current is in L-SIG: mode=" << headerMode << ", psr=" << psr); |
733 |
} |
713 |
} |
734 |
} |
714 |
} |
735 |
|
|
|
736 |
noiseInterferenceW = j->second.GetPower () - powerW; |
737 |
previous = j->first; |
738 |
} |
715 |
} |
739 |
|
716 |
|
740 |
double per = 1 - psr; |
717 |
double per = 1 - psr; |
|
744 |
struct InterferenceHelper::SnrPer |
721 |
struct InterferenceHelper::SnrPer |
745 |
InterferenceHelper::CalculatePlcpPayloadSnrPer (Ptr<InterferenceHelper::Event> event) const |
722 |
InterferenceHelper::CalculatePlcpPayloadSnrPer (Ptr<InterferenceHelper::Event> event) const |
746 |
{ |
723 |
{ |
747 |
NiChanges ni; |
724 |
NiChangesRange ni; |
748 |
double noiseInterferenceW = CalculateNoiseInterferenceW (event, &ni); |
725 |
double noiseInterferenceW = CalculateNoiseInterferenceW (event, &ni); |
749 |
double snr = CalculateSnr (event->GetRxPowerW (), |
726 |
double snr = CalculateSnr (event->GetRxPowerW (), |
750 |
noiseInterferenceW, |
727 |
noiseInterferenceW, |
|
753 |
/* calculate the SNIR at the start of the packet and accumulate |
730 |
/* calculate the SNIR at the start of the packet and accumulate |
754 |
* all SNIR changes in the snir vector. |
731 |
* all SNIR changes in the snir vector. |
755 |
*/ |
732 |
*/ |
756 |
double per = CalculatePlcpPayloadPer (event, &ni); |
733 |
double per = CalculatePlcpPayloadPer (event, ni); |
757 |
|
734 |
|
758 |
struct SnrPer snrPer; |
735 |
struct SnrPer snrPer; |
759 |
snrPer.snr = snr; |
736 |
snrPer.snr = snr; |
|
764 |
struct InterferenceHelper::SnrPer |
741 |
struct InterferenceHelper::SnrPer |
765 |
InterferenceHelper::CalculatePlcpHeaderSnrPer (Ptr<InterferenceHelper::Event> event) const |
742 |
InterferenceHelper::CalculatePlcpHeaderSnrPer (Ptr<InterferenceHelper::Event> event) const |
766 |
{ |
743 |
{ |
767 |
NiChanges ni; |
744 |
NiChangesRange ni; |
768 |
double noiseInterferenceW = CalculateNoiseInterferenceW (event, &ni); |
745 |
double noiseInterferenceW = CalculateNoiseInterferenceW (event, &ni); |
769 |
double snr = CalculateSnr (event->GetRxPowerW (), |
746 |
double snr = CalculateSnr (event->GetRxPowerW (), |
770 |
noiseInterferenceW, |
747 |
noiseInterferenceW, |
|
773 |
/* calculate the SNIR at the start of the plcp header and accumulate |
750 |
/* calculate the SNIR at the start of the plcp header and accumulate |
774 |
* all SNIR changes in the snir vector. |
751 |
* all SNIR changes in the snir vector. |
775 |
*/ |
752 |
*/ |
776 |
double per = CalculatePlcpHeaderPer (event, &ni); |
753 |
double per = CalculatePlcpHeaderPer (event, ni); |
777 |
|
754 |
|
778 |
struct SnrPer snrPer; |
755 |
struct SnrPer snrPer; |
779 |
snrPer.snr = snr; |
756 |
snrPer.snr = snr; |
|
785 |
InterferenceHelper::EraseEvents (void) |
762 |
InterferenceHelper::EraseEvents (void) |
786 |
{ |
763 |
{ |
787 |
m_niChanges.clear (); |
764 |
m_niChanges.clear (); |
788 |
// Always have a zero power noise event in the list |
|
|
789 |
AddNiChangeEvent (Time (0), NiChange (0.0, 0)); |
790 |
m_rxing = false; |
765 |
m_rxing = false; |
791 |
m_firstPower = 0; |
|
|
792 |
} |
793 |
|
794 |
InterferenceHelper::NiChanges::const_iterator |
795 |
InterferenceHelper::GetNextPosition (Time moment) const |
796 |
{ |
797 |
return m_niChanges.upper_bound (moment); |
798 |
} |
799 |
|
800 |
InterferenceHelper::NiChanges::const_iterator |
801 |
InterferenceHelper::GetPreviousPosition (Time moment) const |
802 |
{ |
803 |
auto it = GetNextPosition (moment); |
804 |
// This is safe since there is always an NiChange at time 0, |
805 |
// before moment. |
806 |
--it; |
807 |
return it; |
808 |
} |
809 |
|
810 |
InterferenceHelper::NiChanges::iterator |
811 |
InterferenceHelper::AddNiChangeEvent (Time moment, NiChange change) |
812 |
{ |
813 |
return m_niChanges.insert (GetNextPosition (moment), std::make_pair (moment, change)); |
814 |
} |
766 |
} |
815 |
|
767 |
|
816 |
void |
768 |
void |
|
825 |
{ |
777 |
{ |
826 |
NS_LOG_FUNCTION (this); |
778 |
NS_LOG_FUNCTION (this); |
827 |
m_rxing = false; |
779 |
m_rxing = false; |
828 |
//Update m_firstPower for frame capture |
|
|
829 |
auto it = m_niChanges.find (Simulator::Now ()); |
830 |
it--; |
831 |
m_firstPower = it->second.GetPower (); |
832 |
} |
780 |
} |
833 |
|
781 |
|
834 |
} //namespace ns3 |
782 |
} //namespace ns3 |