What is matched filter matched to?

3.4 The Matched Filter A matched filter is a linear filter designed to provide the maximum SNR at its output for a given transmitted symbol waveform. We refer to Figure 3.1 for the ratio of instantaneous signal power to average noise power at time t = T; out of the receiver block 1, the following results: (3.19)

Why do we need matched filter?

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.

Which is better matched filter or correlator?

To conclude, the matched filter computes true correlation of the received signal with the template signal for the duration of the whole symbol sequence, while the correlator resets itself to zero every symbol time.

What is matched filtering in image processing?

The matched filtering technique can be directly employed in image registration for the estimation of image translation. A matched filter is a linear filter with a transfer function that maximizes the output signal-to-noise ratio (SNR) for an input signal with known properties.

Which is an example of a matched filter?

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. Pulse compression is an example of matched filtering. It is so called because the impulse response is matched to input pulse signals.

When to use a matched filter in radar?

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.

How does a matched filter maximize the signal to noise ratio?

We can derive the linear filter that maximizes output signal-to-noise ratio by invoking a geometric argument. The intuition behind the matched filter relies on correlating the received signal (a vector) with a filter (another vector) that is parallel with the signal, maximizing the inner product.

How is a matched filter used in demodulation?

Matched filtering is a demodulation technique with LTI (linear time invariant) filters to maximize SNR. It was originally also known as a North filter. The following section derives the matched filter for a discrete-time system. The derivation for a continuous-time system is similar, with summations replaced with integrals.