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Technology Stocks : LAST MILE TECHNOLOGIES - Let's Discuss Them Here
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To: Frank A. Coluccio who wrote (2675)12/30/1998 11:17:00 PM
From: ftth  Read Replies (2) of 12823
 
Hi Frank, It's possible that 'overlay' was just a convenient buzz-word to use, but my interpretation would be orthogonal signals occupying the same frequency space.

A loose analogy would be CDMA, where multiple signals occupy the same frequency and time space (they are separated by orthogonal spreading codes). As well, a CDMA "channel" (for lack of a clearer word) could overlay several packed QPSK or QAM channels, but all could be recovered at the receiver because they travel in orthogonal code space.

In the article, they speak of AM-VSB as the overlay (although I wouldn't think the entire 860MHz range would be AM-VSB, but that's beside the point), so my guess is that it is separable from other signals in the same frequency band (but they give no specifics for the other signals, so this is just a guess), and therefore can be considered to 'overlay' existing signals.

dh
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