SunnyQjm/ns-3-dev
1
0 Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

LENA-93 DL CQI averaged over active RBs only from AMC module

Browse Source
This commit is contained in:
Marco Miozzo committed 2011-05-06 09:41:51 +02:00
1 parent 887bd18aef
commit 7fef4a3b23
1 file changed
+24 -18
Download Patch File Download Diff File Expand all files Collapse all files
src/lte/model/lte-amc.cc
+24 -18
View File
@@ -296,28 +296,34 @@ LteAmc::CreateCqiFeedbacks (const SpectrumValue& sinr)
for (it = sinr.ConstValuesBegin (); it != sinr.ConstValuesEnd (); it++)
{
double sinr_ = (*it);
if (sinr_ == 0.0)
{
cqi.push_back (-1); // SINR == 0 means no signal in this RB
}
else
{
/*
* Compute the spectral efficiency from the SINR
* SINR
* spectralEfficiency = log2 (1 + -------------------- )
* -ln(5*BER)/1.5
* NB: SINR must be expressed in natural unit:
* (SINR)dB => 10 ^ (SINR/10)
*/
/*
* Compute the spectral efficiency from the SINR
* SINR
* spectralEfficiency = log2 (1 + -------------------- )
* -ln(5*BER)/1.5
* NB: SINR must be expressed in natural unit:
* (SINR)dB => 10 ^ (SINR/10)
*/
double s = log2 ( 1 + (
pow (10, sinr_ / 10 ) /
( (-log (5.0 * 0.00005 )) / 1.5) ));
double s = log2 ( 1 + (
pow (10, sinr_ / 10 ) /
( (-log (5.0 * 0.00005 )) / 1.5) ));
int cqi_ = GetCqiFromSpectralEfficiency (s);
int cqi_ = GetCqiFromSpectralEfficiency (s);
NS_LOG_FUNCTION ("channel_id = " << cqi.size ()
<< "sinr = " << sinr_
<< "spectral efficiency =" << s
<< " ---- CQI = " << cqi_ );
NS_LOG_FUNCTION ("channel_id = " << cqi.size ()
<< "sinr = " << sinr_
<< "spectral efficiency =" << s
<< " ---- CQI = " << cqi_ );
cqi.push_back (cqi_);
cqi.push_back (cqi_);
}
}
return cqi;