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What is precursor ISI? (Read 402 times)
ywguo
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What is precursor ISI?
Nov 19th, 2012, 6:03am
 
Hi Guys,

I know that ISI is inter-symbol interference. But could you please tell me what precursor ISI is? Please have a look at page 13 in the linked slides.
http://www.ece.tamu.edu/~spalermo/ecen689/lecture7_ee689_eq_intro_txeq.pdf

Best Regards,
Yawei
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raja.cedt
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Re: What is precursor ISI?
Reply #1 - Nov 19th, 2012, 7:40am
 
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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ywguo
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Re: What is precursor ISI?
Reply #2 - Nov 20th, 2012, 3:21am
 
Thank you, Raj.
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