Doug McDonald wrote: >>In other words, if a given PN1023 sequence is very, very good for >>training, then use 2000 data symbols instead. What's the big deal? > >Self-orthogonality, that's what. 2047 ... or even 1023 ... training >symbols in the form of a self-orthogonal training sequence is worth >about 200,000 random symbols. While it is very easy to get >amplitude information from random symbols, phase information is >much harder. It's not terribly hard to track the phase info, one it is >obtained from a training sequence. So you're saying that you'd still want to use the PN511, at least, to begin tracking phase info. I keep thinking, though, that you know a priori that any Q info carried by the 8-VSB symbols is distortion. That knowledge has to be worth something, comparing this equalizer design with one that has to work with QAM. If you diddle with the equalizer coefficients and get a flat amplitude at the output, but with some Q energy, you know right now that the phase correction is wrong. You don't need to wonder what the actual phase info should be, except to create an output with no phase variation. So maybe you're back to John Shutt's recursive methods, but again with a continuous supply of "training sequences," I don't see that as being such a problem. Bert _________________________________________________________________ On the road to retirement? Check out MSN Life Events for advice on how to get there! http://lifeevents.msn.com/category.aspx?cid=Retirement ---------------------------------------------------------------------- You can UNSUBSCRIBE from the OpenDTV list in two ways: - Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org - By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word unsubscribe in the subject line.