[opendtv] Re: 20040722 Thundering Thursday Thanks (Mark's Monday Memo)

  • From: "John Shutt" <shuttj@xxxxxxxxx>
  • To: <opendtv@xxxxxxxxxxxxx>
  • Date: Fri, 23 Jul 2004 16:03:49 -0400

----- Original Message ----- 
From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>

> ... Two examples
> that we've discussed in the past would be use of the training sequence,
> instead of relying only on blind equalization, which would reduce
> the C/N ratio required for symbol sync and also increase tolerance to
> dynamic echo. ...


You keep referring to this, but it is my understanding that the reason why
most chip manufacturers ignored the training sequence and went with blind
adaptation was the fact that the training signals were too few and far
between to use in tracking any sort of dynamic multipath.

If I recall correctly, it was the blind equalization techniques that NxtWave
and Motorola were referring to when they wrote their Summer 1999 press
releases that claimed to "crack the code" of 8-VSB.

I also seem to recall that Dr. McDonald also was of the opinion that if
there were more training signals, then 8-VSB would have been much easier to
equalize for dynamic multipath, but blind adaptation techniques are required
with the current training signals.

Am I incorrect in my recollections?


John Shutt

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