Which of the following statements about the matched filter in a communication receiver are correct ?

(A) It may produce phase error if synchronization is improper

(B) Its impulse response depends on the singal shape

(C) The characteristics of the matched filter is matched with the transmitted data

(D) It produces inter symbol interference

(E) It measures the correlation between incoming received message and its impulse response

Choose the correct answer from the options given below : 

Matched Filter:

• Matched Filter is used to produce an output in such a way that it maximizes the ratio of the output peak power to the mean noise power in its frequency response.
• The frequency response of Magnitude and phase angle of the Matched Filter varies uniformly with frequency.
•  The impulse response of the matched filter depends upon the signal shape. It is the mirror image of the received signal about a time instant.
• The Characteristics of the matched filter are matched with the transmitted data.
• The matched filter reduces INTERSYMBOL INTERFERENCE by attenuating the beginning and end of each symbol period.
• Matched Filter measures the correlation between incoming received message and its impulse response.

Important Points:

• A time delay is necessary for the specification of the filter for reasons of physical realizability since there can be no output from the filter until the signal is applied.
• The frequency-response function of the matched filter is the conjugate of the spectrum of the received waveform except for the phase shift exp (- j2Πft).
• This phase shift varies uniformly with frequency. Its effect is to cause a constant time delay.