diff options
Diffstat (limited to 'Transceiver52M/sigProcLib.cpp')
| -rw-r--r-- | Transceiver52M/sigProcLib.cpp | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/Transceiver52M/sigProcLib.cpp b/Transceiver52M/sigProcLib.cpp index 21978ff..df87f94 100644 --- a/Transceiver52M/sigProcLib.cpp +++ b/Transceiver52M/sigProcLib.cpp @@ -1478,7 +1478,13 @@ static float computeCI(const signalVector *burst, const CorrelationSequence *syn /* Esimate Carrier power */ C = xcorr.norm2() / ((N - 1) * sync->gain.abs()); - /* Interference = Signal - Carrier, so C/I = C / (S - C) */ + /* Interference = Signal - Carrier, so C/I = C / (S - C). + * Calculated in dB: + * C/I_dB = 10 * log10(C/I) + * C/I_dB = 10 * (1/log2(10)) * log2(C/I) + * C/I_dB = 10 * 0.30103 * log2(C/I) + * C/I_dB = 3.0103 * log2(C/I) + */ return 3.0103f * log2f(C / (S - C)); } |