F5/unison
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

add some info logs, improve snr vs ber curve output, linearize the ber calculations.

Browse Source
This commit is contained in:
Mathieu Lacage
2007-11-20 16:45:52 +01:00
parent 87a1ae56d7
commit ed8ef96a61
1 changed files with 10 additions and 26 deletions
Download Patch File Download Diff File Expand all files Collapse all files

36
src/devices/wifi/wifi-phy.cc
View File

@@ -285,7 +285,7 @@ WifiPhy::ReceivePacket (Packet const packet,
case WifiPhy::IDLE:
if (rxPowerW > m_edThresholdW)
{
NS_LOG_DEBUG ("sync power="<<rxPowerW<<"W)");
NS_LOG_DEBUG ("sync (power="<<rxPowerW<<"W)");
// sync to signal
NotifySyncStart (rxDuration);
SwitchToSync (rxDuration);
@@ -412,12 +412,13 @@ WifiPhy::Configure80211aParameters (void)
void
WifiPhy::PrintModes (void) const
{
#ifdef PHY80211_DEBUG
for (double db = 0; db < 30; db+= 0.5) {
std::cout <<db<<" ";
#if 0
for (double db = -10; db < 30; db+= 0.5) {
double snr = DbToRatio (db);
std::cout <<snr<<" ";
for (uint8_t i = 0; i < GetNModes (); i++) {
WifiMode mode = GetMode (i);
double ber = 1-GetChunkSuccessRate (mode, DbToRatio (db), 1);
double ber = 1-GetChunkSuccessRate (mode,snr, 2000*8);
std::cout <<ber<< " ";
}
std::cout << std::endl;
@@ -801,6 +802,7 @@ WifiPhy::GetBpskBer (double snr, uint32_t signalSpread, uint32_t phyRate) const
double EbNo = snr * signalSpread / phyRate;
double z = sqrt(EbNo);
double ber = 0.5 * erfc(z);
NS_LOG_INFO ("bpsk snr="<<snr<<" ber="<<ber);
return ber;
}
double
@@ -811,6 +813,7 @@ WifiPhy::GetQamBer (double snr, unsigned int m, uint32_t signalSpread, uint32_t
double z1 = ((1.0 - 1.0 / sqrt (m)) * erfc (z)) ;
double z2 = 1 - pow ((1-z1), 2.0);
double ber = z2 / Log2 (m);
NS_LOG_INFO ("Qam m="<<m<<" rate=" << phyRate << " snr="<<snr<<" ber="<<ber);
return ber;
}
uint32_t
@@ -888,16 +891,7 @@ WifiPhy::GetFecBpskBer (double snr, double nbits,
}
double pd = CalculatePd (ber, dFree);
double pmu = adFree * pd;
if (pmu > 1.0)
{
/**
* If pmu is bigger than 1, then, this calculation is
* giving us a useless bound. A better bound in this case
* is 1 - ber which is necessarily bigger than the real
* success rate.
*/
return ber;
}
pmu = std::min (pmu, 1.0);
double pms = pow (1 - pmu, nbits);
return pms;
}
@@ -920,17 +914,7 @@ WifiPhy::GetFecQamBer (double snr, uint32_t nbits,
/* second term */
pd = CalculatePd (ber, dFree + 1);
pmu += adFreePlusOne * pd;
if (pmu > 1.0)
{
/**
* If pmu is bigger than 1, then, this calculation is
* giving us a useless bound. A better bound in this case
* is 1 - ber which is necessarily bigger than the real
* success rate.
*/
return ber;
}
pmu = std::min (pmu, 1.0);
double pms = pow (1 - pmu, nbits);
return pms;
}