Convert demodulation I/Q to soft Data

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davyzhu

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I am designing ECC(LDPC) encoder/decoder. And I find a reference
design's datasheet. It's ECC decoder have two digital input Data_I and
Data_Q. Someone tell me it related to demodulation, but I am new to
this area.

And is it related to downconverted to baseband?

Is it hard to convert Data_I and Data_Q to Data?

Any suggestions will be appreciated!

Best regards,
Davy
 

What is "soft information"?
 

For example,

BPSK +1->0, -1->1, so when I receive -0.45, the hard-decision result will be 1, but the soft-decision result is -0.45.

Regards,
Davy
 

I have the same problem, have you found the answer? do you know how to perform soft decoding for LDPC codes by using I and Q data form demodulator? Please inform me if you have any paper about this topic

Thanks in advance
 

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