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Transceiver52M: Ignore detected bursts at the noise floor 

The transceiver has the ability to detect bursts below the noise floor,
but little hope in successful decoding, so don't even try. We still use
the detected burst to differentiate against noise vs actual data.

Signed-off-by: Thomas Tsou <tom@tsou.cc>
This commit is contained in:
Thomas Tsou 2013-11-14 15:31:24 -05:00
parent 2d0c00bd3d
commit ef25dba4e7
1 changed files with 5 additions and 4 deletions
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Transceiver52M/Transceiver.cpp
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@ -429,7 +429,7 @@ SoftVector *Transceiver::pullRadioVector(GSM::Time &wTime, int &RSSI,
float toa, pow, max = -1.0, avg = 0.0;
int max_i = -1;
signalVector *burst;
SoftVector *bits;
SoftVector *bits = NULL;
/* Blocking FIFO read */
radioVector *radio_burst = mReceiveFIFO[chan]->read();
@ -463,9 +463,8 @@ SoftVector *Transceiver::pullRadioVector(GSM::Time &wTime, int &RSSI,
/* Average noise on diversity paths and update global levels */
burst = radio_burst->getVector(max_i);
avg = avg / radio_burst->chans();
avg = sqrt(avg / radio_burst->chans());
mNoiseLev = mNoises.avg();
avg = sqrt(avg);
/* Detect normal or RACH bursts */
if (type == TSC)
@ -483,7 +482,9 @@ SoftVector *Transceiver::pullRadioVector(GSM::Time &wTime, int &RSSI,
if (equalize && (type != TSC))
equalize = false;
bits = demodulate(&mStates[chan], *burst, amp, toa, time.TN(), equalize);
if (avg - mNoiseLev > 0.0)
bits = demodulate(&mStates[chan], *burst, amp, toa, time.TN(), equalize);
wTime = time;
RSSI = (int) floor(20.0 * log10(rxFullScale / avg));
timingOffset = (int) round(toa * 256.0 / mSPSRx);