[opendtv] Re: China writes its own digital TV standard
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Tue, 27 Jun 2006 12:44:57 -0400
> Or is the PN sequence in the GI somehow not a problem for
> simple receivers?
My answer to my question is that for simple receivers that depend on the
GI being an interval, introducing noise into the GI will at least
increase the C/N margin. The new PN sequence will look like ISI to
simple receivers, although uncorrelated. If symbols are smeared by
multipath, now you will be adding noise *to* the symbols.
So either you degrade the performance of simple receivers, for which
COFDM was developed, or you get away from the idea that the most basic
equalizers will work well with COFDM.
I was looking for some handy equation that relates performance to noise
in the GI.
Bert
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