Terayon - S CDMA player (TERN) Message Board

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Technology Stocks : Terayon - S CDMA player (TERN)

TERN 26.34

+0.9%

3:59 PM EST

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To: Bernard Levy who wrote (239)	1/19/2000 10:47:00 PM
From: Dennis O'Bell	Read Replies (1) of 1658

Bernard, one has to admit that DMT/OFDM are also context dependant, to whit they are suitable where the transmission medium is highly dispersive and/or frequency dependant but linear. As is the case on twisted pair subscriber loops, which hardly behave like the proverbial "50 ohm" transmission line, and in terrestrial mobile wireless, where the signal is usually contaminated by multipath. Cable isn't plagued much by these problems, though there are others peculiar to that medium. Spectral efficiency is a function of modulation/error coding rather than DMT per se, and essentially DMT is just a bunch of numerically synthesized modems running in parallel. I wouldn't bet that Gilder isn't aware of this, though he may have passed over a few details in his newsletters.

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