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* new packet score function

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This commit is contained in:
Scott Powell 2025-02-04 15:00:28 +11:00
parent 7da0a5f7ec
commit a93412216a
6 changed files with 28 additions and 21 deletions
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21
src/helpers/RadioLibWrappers.cpp
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@ -96,3 +96,24 @@ float RadioLibWrapper::getLastRSSI() const {
float RadioLibWrapper::getLastSNR() const {
return _radio->getSNR();
}
// Approximate SNR threshold per SF for successful reception (based on Semtech datasheets)
static float snr_threshold[] = {
-7.5, // SF7 needs at least -7.5 dB SNR
-10, // SF8 needs at least -10 dB SNR
-12.5, // SF9 needs at least -12.5 dB SNR
-15, // SF10 needs at least -15 dB SNR
-17.5,// SF11 needs at least -17.5 dB SNR
-20 // SF12 needs at least -20 dB SNR
};
float RadioLibWrapper::packetScoreInt(float snr, int sf, int packet_len) {
if (sf < 7) return 0.0f;
if (snr < snr_threshold[sf - 7]) return 0.0f; // Below threshold, no chance of success
auto success_rate_based_on_snr = (snr - snr_threshold[sf - 7]) / 10.0;
auto collision_penalty = 1 - (packet_len / 256.0); // Assuming max packet of 256 bytes
return max(0.0, min(1.0, success_rate_based_on_snr * collision_penalty));
}