##  [Matched Filter Principle](/matched-filter-principle) 

  ##  [Matched Filter Principle](https://information.quantumdictionary.io/matched-filter-principle-0) 

  

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**Information & Communication Dictionary**

 







 

 

 

 



 

 

 

 

Definition

A detection principle that for a known deterministic signal in additive white Gaussian noise prescribes a linear filter whose impulse response is the time‑reversed complex conjugate of the known signal: this filter maximizes the output signal‑to‑noise ratio among all linear filters and implements the maximum‑likelihood detector for that model.