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soft decision and hard decision in digital communication

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sridhara

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hi friends......
explain me about the hard decision and soft decision decoding in digital communication
 

in hard decoding urs decoder outputs the deoded symbol for bin case 0 or 1
but
for the soft output the decoder will generate the probability of the bit being one or zero or for more then 2 level communication it will generate the prob for some particular symbols
 

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