[opendtv] Re: 20060616 Free Friday Fragments (Mark's Monday Memo)
- From: "Allen Le Roy Limberg" <allimberg@xxxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Fri, 16 Jun 2006 18:09:23 -0400
Doug's original signature analysis technique calculates the equalizer
coefficients from scratch, not by incremental adaptation. Noise is averaged
out by integrating successive coefficient determinations. So, when there is
a concealed-path / revealed-path change in the echo spectrum, the equalizer
can update very rapidly without having to wait for errors to accumulate.
Later work uses a parallel equalizer approach, with decision feedback being
used to reduce long post-echoes.
Allen
----- Original Message -----
From: "John Shutt" <shuttj@xxxxxxxxx>
To: <opendtv@xxxxxxxxxxxxx>
Sent: Friday, June 16, 2006 3:32 PM
Subject: [opendtv] Re: 20060616 Free Friday Fragments (Mark's Monday Memo)
> That might work as long as the change in multipath isn't very great from
> snapshot to snapshot. Calculating taps is a recursive process and if
there
> were drastic changes from "look" to "look" it would require several
> iterations to recalculate the proper taps to cancel out the new echo
> ensemble. That eats up both time and energy.
>
> John
>
> ----- Original Message -----
>
> > Once synchronized, the receiver comes on about 2000 symbols prior to its
> > allocated time slot, or 186 usec prior, to train itself. Right after
> > this training it receives the data, then goes back to sleep mode.
> > Perhaps once in awhile, the receiver looks for the training segment
> > again, to correct its internal clock.
> >
> > That should save a lot of power.
>
>
>
>
>
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