diff options
Diffstat (limited to 'Transceiver52M')
| -rw-r--r-- | Transceiver52M/Transceiver.cpp | 18 | ||||
| -rw-r--r-- | Transceiver52M/sigProcLib.cpp | 15 |
2 files changed, 26 insertions, 7 deletions
diff --git a/Transceiver52M/Transceiver.cpp b/Transceiver52M/Transceiver.cpp index d4ca4b9..2e09512 100644 --- a/Transceiver52M/Transceiver.cpp +++ b/Transceiver52M/Transceiver.cpp @@ -44,6 +44,15 @@ using namespace GSM; /* Number of running values use in noise average */ #define NOISE_CNT 20 +/* + * Burst detection threshold + * + * Decision threshold value for burst gating on peak-to-average value of + * correlated synchronization sequences. Lower values pass more bursts up + * to upper layers but will increase the false detection rate. + */ +#define BURST_THRESH 4.0 + TransceiverState::TransceiverState() : mRetrans(false), mNoiseLev(0.0), mNoises(NOISE_CNT), mPower(0.0) { @@ -534,23 +543,22 @@ Transceiver::CorrType Transceiver::expectedCorrType(GSM::Time currTime, int Transceiver::detectBurst(signalVector &burst, complex &, float &toa, CorrType type) { - float threshold = 5.0, rc = 0; + int rc = 0; switch (type) { case EDGE: - rc = detectEdgeBurst(burst, mTSC, threshold, mSPSRx, + rc = detectEdgeBurst(burst, mTSC, BURST_THRESH, mSPSRx, amp, toa, mMaxExpectedDelayNB); if (rc > 0) break; else type = TSC; case TSC: - rc = analyzeTrafficBurst(burst, mTSC, threshold, mSPSRx, + rc = analyzeTrafficBurst(burst, mTSC, BURST_THRESH, mSPSRx, amp, toa, mMaxExpectedDelayNB); break; case RACH: - threshold = 6.0; - rc = detectRACHBurst(burst, threshold, mSPSRx, amp, toa, + rc = detectRACHBurst(burst, BURST_THRESH, mSPSRx, amp, toa, mMaxExpectedDelayAB); break; default: diff --git a/Transceiver52M/sigProcLib.cpp b/Transceiver52M/sigProcLib.cpp index 6495b1e..3682227 100644 --- a/Transceiver52M/sigProcLib.cpp +++ b/Transceiver52M/sigProcLib.cpp @@ -1678,6 +1678,17 @@ release: return status; } +/* + * Peak-to-average computation +/- range from peak in symbols + */ +#define COMPUTE_PEAK_MIN 2 +#define COMPUTE_PEAK_MAX 5 + +/* + * Minimum number of values needed to compute peak-to-average + */ +#define COMPUTE_PEAK_CNT 5 + static float computePeakRatio(signalVector *corr, int sps, float toa, complex amp) { @@ -1691,7 +1702,7 @@ static float computePeakRatio(signalVector *corr, peak = corr->begin() + (int) rint(toa); - for (int i = 2 * sps; i <= 5 * sps; i++) { + for (int i = COMPUTE_PEAK_MIN * sps; i <= COMPUTE_PEAK_MAX * sps; i++) { if (peak - i >= corr->begin()) { avg += (peak - i)->norm2(); num++; @@ -1702,7 +1713,7 @@ static float computePeakRatio(signalVector *corr, } } - if (num < 2) + if (num < COMPUTE_PEAK_CNT) return 0.0; rms = sqrtf(avg / (float) num) + 0.00001; |