On 21 Feb, 06:05, Eric Jacobsen <eric.jacob...@ieee.org> wrote:

> He's talking about a communication system where the "matched filter"
> is the pulse shaping filter. * Root Raised Cosine is a very common
> matched filter that is applied to both the transmit and recieve pulses
> to get a Raised Cosine frequency response.
>
> The "rectangular" reference means unfiltered NRZ pulses, i.e.,
> rectangular symbols.

Does 'matched filter' mean something else in this application
than I think it does? If you have a 'raw' symbol and apply a
window function to it, a 'classical' matched filter which
looks for the 'raw' symbol will not preform very well at all.

My experience with matched filters is with certain types
of sonars, where the system has to be tuned to what will
be *recieved*. Frequency-dependent scattering and absorption
effects mess up broad-band pulses to the extent that the
matched filters at the recievers miss the reflections
altogether. When we see that happen, we need to adjust
the bandwidth of the transotted pulse so as to minimize
the degrading scattering and absorption effects.

Rune