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Correct max. number of possible V/D 2 errors and document its meaning.

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This commit is contained in:
Mathias Weyland 2016-04-22 13:53:48 +02:00
parent b42d20d08e
commit 1852f140af
1 changed files with 6 additions and 1 deletions
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7
YSFPayload.cpp
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@ -423,7 +423,12 @@ void CYSFPayload::decodeVDMode2(unsigned char fn)
}
}
LogMessage("YSF, V/D Mode 2, Repetition FEC %u/270 (%.1f%%)", errors, float(errors) / 270.0F);
// "errors" is the number of triplets that were recognized to be corrupted
// and that were corrected. There are 27 of those per VCH and 5 VCH per CC,
// yielding a total of 27*5 = 135. I believe the expected value of this
// error distribution to be Bin(1;3,BER)+Bin(2;3,BER) which entails 75% for
// BER = 0.5.
LogMessage("YSF, V/D Mode 2, Repetition FEC %u/135 (%.1f%%)", errors, float(errors) / 135.0F);
unsigned char dch[25U];