Howtosignalprocessing
- What does a matched filter do?
- Why matched filter is required?
- What is the difference between matched filter and non matched filter?
- How does matched filter increases SNR?
What does a matched filter do?
The matched filter is the optimal linear filter for maximizing the signal-to-noise ratio (SNR) in the presence of additive stochastic noise. Matched filters are commonly used in radar, in which a known signal is sent out, and the reflected signal is examined for common elements of the out-going signal.
Why matched filter is required?
Reasons for Using Matched Filtering
You can see from the results in Receiver Operating Characteristics that the probability of detection increases with increasing SNR. For a deterministic signal in white Gaussian noise, you can maximize the SNR at the receiver by using a filter matched to the signal.
What is the difference between matched filter and non matched filter?
The noncoherent matched filter has impulse response derived from the transmitted pulse shape, and when the pulse shape is a passband signal the matched filter impulse response my have initial phase not equal to the initial phase of the pulse shape waveform.
How does matched filter increases SNR?
The matched filter improves the SNR by reducing the noise's spectral bandwidth to that of the wavelet, and in addition, reduces the noise within the wavelet's bandwidth by the shape of the wavelet's spectrum.
