diff options
| author | ttsou <ttsou@19bc5d8c-e614-43d4-8b26-e1612bc8e597> | 2012-12-06 15:43:55 +0000 |
|---|---|---|
| committer | ttsou <ttsou@19bc5d8c-e614-43d4-8b26-e1612bc8e597> | 2012-12-06 15:43:55 +0000 |
| commit | e8dde02a66a3776eead8d89441a04921fd55f274 (patch) | |
| tree | 17111db57f20cba925df60fd86daa72ea1f2f137 | |
| parent | 9eafbe9c88c67b1b3b05659a933bab7da9bb4612 (diff) | |
transceiver52m: reset energy threshold on receive gain changes
The adaptive energy detection threshold does not scale relative
to signal level. In other words, the adjustment factor will be
the same whether the at 40% of signal level or 4%. If the receive
gain is reduced by a large amount, suppose 20 dB, the receiver
may take minutes to adjust to the new level.
When the receive gain is changed, reset the threshold back to
the initial level. This reduces issues of runtime gain adjustment
and prevents blocking bursts while the threhold level slowly
adjusts.
Signed-off-by: Thomas Tsou <tom@tsou.cc>
git-svn-id: http://wush.net/svn/range/software/public/openbts/trunk@4595 19bc5d8c-e614-43d4-8b26-e1612bc8e597
| -rw-r--r-- | Transceiver52M/Transceiver.cpp | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/Transceiver52M/Transceiver.cpp b/Transceiver52M/Transceiver.cpp index f5fa822..ff5de49 100644 --- a/Transceiver52M/Transceiver.cpp +++ b/Transceiver52M/Transceiver.cpp @@ -44,6 +44,8 @@ # define USB_LATENCY_MIN 1,1 #endif +#define INIT_ENERGY_THRSHD 5.0f + Transceiver::Transceiver(int wBasePort, const char *TRXAddress, int wSamplesPerSymbol, @@ -101,7 +103,7 @@ Transceiver::Transceiver(int wBasePort, mTxFreq = 0.0; mRxFreq = 0.0; mPower = -10; - mEnergyThreshold = 5.0; // based on empirical data + mEnergyThreshold = INIT_ENERGY_THRSHD; prevFalseDetectionTime = startTime; } @@ -506,6 +508,7 @@ void Transceiver::driveControl() int newGain; sscanf(buffer,"%3s %s %d",cmdcheck,command,&newGain); newGain = mRadioInterface->setRxGain(newGain); + mEnergyThreshold = INIT_ENERGY_THRSHD; sprintf(response,"RSP SETRXGAIN 0 %d",newGain); } else if (strcmp(command,"NOISELEV")==0) { |