##  [Decision Feedback Equalizer](/decision-feedback-equalizer) 

  ##  [Decision Feedback Equalizer](https://information.quantumdictionary.io/decision-feedback-equalizer-0) 

  

 [![Information & Communication Dictionary](/sites/default/files/styles/large/public/2026-01/Information%20%26%20Communication.png.webp?itok=g4emS-T7)](/topic-specific-dictionaries/information-communication)



**Information & Communication Dictionary**

 







 

 

 

 



 

 

 

 

Definition

An equalizer architecture composed of a feedforward filter and a feedback filter that uses past detected symbols (decisions) fed back through the feedback filter to cancel postcursor intersymbol interference; the feedback path subtracts the ISI contribution predicted from previous symbol estimates, reducing noise amplification compared with a pure linear inverse while introducing risk of error pro