We clasify communication as hard or soft.Explain two soft communication channels using appropriate headings?

Answer 1

I remember doing a homework problem like this once .

Hard decisions mean you declare the bit to be 0 or 1.
Soft decisions mean you associate a reliability with the decision.

One example is the binary-erasure channel. Using, say, BPSK, you would declare an erasure if the magnitude of the log likelihood ratio is less than some threshold.