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From: Nitram on 23 Nov 2009 22:31

>
>If you're trying to simulate the effects of a frequency offset and how
>it would be affected by the frequency selectivity of the RF or IF
>filter, that looks appropriate to me.
>
Thank you so much, I will try it.
From: Grant Griffin on 24 Nov 2009 20:49
Nitram wrote:
>> Why not model the RF filter effect at baseband? Is there an asymmetric
>> distortion that you need to model?
>
> What I would need to do is shift my baseband signal by a certain frequency
> offset, pass it through a lowpass filter to emulate a receiver RF filter(in
> the graph the lowpass filter is represented by a brickwall filter) and then
> attempt to find the frequency of the random shift on the receiver. ^
> ^
> | |_________
> |______ | _____|<--low pass filter
> | \ | | |\
> | \ --> | | | \<--shifted signal
> |________\_________>f |___|_____|__\______>f
> <--------> <-------->
> BW
....


Cool text-graph!

Grant
--
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Grant R. Griffin
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From: robert bristow-johnson on 25 Nov 2009 20:57
On Nov 24, 8:49 pm, Grant Griffin <nob...(a)example.com> wrote:
> Nitram wrote:
> >> Why not model the RF filter effect at baseband?  Is there an asymmetric
> >> distortion that you need to model?
>
> > What I would need to do is shift my baseband signal by a certain frequency
> > offset, pass it through a lowpass filter to emulate a receiver RF filter(in
> > the graph the lowpass filter is represented by a brickwall filter) and then
> > attempt to find the frequency of the random shift on the receiver. ^      
> >                    ^  
> > |                           |_________        
> > |______                     |    _____|<--low pass filter
> > |      \                    |   |     |\
> > |       \               --> |   |     | \<--shifted signal
> > |________\_________>f       |___|_____|__\______>f  
> > <-------->                      <-------->
> >     BW
>
> ...
>
> Cool text-graph!
>

yeah, i'm impressed, too. makes me continue to be glad i read these
with a mono-spaced font.

and always, it's nice to see you in these parts, Grant.

r b-j
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