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From: -W on 19 Jun 2008 07:32
Can anyone direct me to a good reference on learning how Matlab
processes data via either
the "resample" command or the "interp" command in the Signal
Processign
Toolbox? I need to understand what the other parameters in resample
do.

Context:
I am building a simulated WiMAX signal that can be played out of an
arbitrary wavefom
generator. I have to make a sampling rate up-conversion to allow the
final signal to be
played.

If I use either "interp" or "resample" my spectrum is wrapped around
half
of the new sampling frequency (Fs/2). When played out of the Arb, the
spectrum is all wrong

The reason is that I am using the ifft function to build the initial
timebased waveform (I and
Q) from a set carrier map. As such, Matlab is interpreting my carrier
map as being only the
positive half of the spectrum, the other half being in negative
frequency space (which it is
not). So either "interp" or "resample" fold across Fs/2.

Regards
-W
From: Jos on 19 Jun 2008 10:45
-W <sys73962(a)yahoo.com> wrote in message
<fdfb0020-8b6f-4ba3-b2e9-a2a67c7b28fc(a)x41g2000hsb.googlegroups.com>...
> Can anyone direct me to a good reference on learning how
Matlab
> processes data via either
> the "resample" command or the "interp" command in the Signal
> Processign
> Toolbox? I need to understand what the other parameters
in resample
> do.
>
> Context:
> I am building a simulated WiMAX signal that can be played
out of an
> arbitrary wavefom
> generator. I have to make a sampling rate up-conversion
to allow the
> final signal to be
> played.
>
> If I use either "interp" or "resample" my spectrum is
wrapped around
> half
> of the new sampling frequency (Fs/2). When played out of
the Arb, the
> spectrum is all wrong
>
> The reason is that I am using the ifft function to build
the initial
> timebased waveform (I and
> Q) from a set carrier map. As such, Matlab is interpreting
my carrier
> map as being only the
> positive half of the spectrum, the other half being in
negative
> frequency space (which it is
> not). So either "interp" or "resample" fold across Fs/2.
>
> Regards
> -W

type resample
type interp

might be a place to start ...

hth
Jos
From: -W on 19 Jun 2008 13:48
From Jos
<snip>
On Jun 19, 10:45 am, "Jos " <DEL...(a)jasenDEL.nl> wrote:
> type resample
> type interp
<snip>

Thanks Jos, unfortunately Matlab's documentation is not always as
complete as one would like. Is there other free standing
documentation? For example, Tutorials, Theses, White Papers, etc.

The base level documentation is clear, but both commands have several
"extra" parameters that relate to the filtering that happens post
insertion of the extra zeros.

I need a more intuitive understanding of what these parameters affect
inside the FIR and/or polyphase filtering subroutines.

Has anyone had experience in calling Matlab tech support directly?
Should I ask for somethere there by name?

Regards
-W
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