On 20 Feb, 07:04, dbd <d...@ieee.org> wrote:
> On Feb 19, 1:07 pm, Rune Allnor <all...@tele.ntnu.no> wrote:
>
> ...
>
> > You are right. I didn't understand (and still don't) why and
> > how the terms 'rectangular' or 'raised cosine' appear in
> > a discussion about matched filters. Are these impulse repsonses
> > or transfer functions?
>
> > Rune
>
> Rune
>
> It seemed to me that the windows were applied in the poster's
> transmission processing while generating the signal to be transmitted
> and then hopefully matched in the receiver.

...as is not unheard of...

> That would make them part
> of the impulse response to a symbol at the transmitter output.

...which brings us back to my first question: Why are they
treated explicitly? If they are the transmitted impulses
then there is no need to mention their specific forms,
everything is already taken care of in the general theory
of matched filters.

> That
> would make them part of the transmission processing *'transfer
> function' from symbol to impulse response.

If the windows are viewed as weight functions applied to some
other 'raw' input signal (like if they are used to ease the
load on a transmitter at high powers) the matched filter is
trying to detect the wrong pulse shape. The filter should try
and match what is actually transmitted rather than the 'raw'
pulse shapes that are fed to the transmitter stages.

I just don't understand the OP's question.

Rune