vrr/OpenBTS
2
0
Fork 0
mirror of https://github.com/PentHertz/OpenBTS.git synced 2026-04-30 04:19:28 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

transceiver: rework digital gain settings

Browse source 
The output of the modulator or resampler is scaled and
converted from floating point to fixed point. The scaling
factor is the leftover dB in RF attention (relative to max
transmit power), which is handled prior to the integer
conversion. This should work across all daughterboards and
non-UHD installations.

Signed-off-by: Thomas Tsou <ttsou@vt.edu>

git-svn-id: http://wush.net/svn/range/software/public/openbts/trunk@2650 19bc5d8c-e614-43d4-8b26-e1612bc8e597
This commit is contained in:
Kurtis Heimerl 2011-11-26 03:17:38 +00:00
parent e1beaa7745
commit 8a5781f7fa
2 changed files with 4 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

7
Transceiver52M/radioInterface.cpp
View file

@ -101,15 +101,14 @@ double RadioInterface::fullScaleOutputValue(void) {
}
void RadioInterface::setPowerAttenuation(double dBAtten)
void RadioInterface::setPowerAttenuation(double atten)
{
double HWatten = mRadio->setTxGain(mRadio->maxTxGain() - atten);
atten -= (-HWatten);
atten -= HWatten;
if (atten < 1.0)
powerScaling = 1.0;
else
powerScaling = 1.0/sqrt(linearAtten);
LOG(INFO) << "setting HW gain to " << HWdBAtten << " and power scaling to " << powerScaling;
powerScaling = 1.0 / sqrt(pow(10, (atten / 10.0)));
}