Soft decision information
Why use Soft bits?
- Radio and Cable systems are analog so at some point require an ADC
- Soft decision bits are extra precision bits from the Analog domain
- Since we calculate difference from an expected value if we can pass more of the analog information through to the decoder, the more accurate the end result will be
- Soft bits are a method of expressing the “strength” of a received “0” or “1”
- Use “signed style” to indicate the likely bit value and it’s strength
- msb is likely bit value
- lsbs are strength (use 2’s complement form)