raja.cedt
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hello, ISI can be thought of as the effect of past and future symbols on the current symbol. We call previous bit effect as post-cursor ISI and next bit effect pre-cursor.
In case of DFE, we are correcting present bit with knowledge of previously sampled bit which is sampled already. So with this idea we can correct for post cursor ISI, but we don't know abut next bit so DFE can't correct pre-cursor ISI.
Hope i didn't confuse you.
Thanks, Raj.
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