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Technology Stocks : Terayon - S CDMA player (TERN) -- Ignore unavailable to you. Want to Upgrade?

To: Dennis O'Bell who wrote (248)	1/20/2000 1:37:00 PM
From: Bernard Levy	Read Replies (1) \| Respond to of 1658

Hi Dennis: DMT more than any other technique is ideally placed for achieving channel capacity, since it subdivides the overall bandwidth in narrow subchannels, for which the corresponding modulation order (QAM order) is adapted to the signal ratio prevailing in the channel. This is exactly what communications theory recommends. I am aware that one can come close to this performance with other approaches, like with ordinary QAM and an extremely long equalizer. However the complexity of the required equalizer makes it hell to implement. I am surprised by your comment that the cable plant is significantly easier to deal with than copper or wireless. The QAM-based transceiver architectures I have seen for cable use a blind equalizer, and at a top level are rather similar to the architectures used for MMDS with ordinary QAM modulation. Best regards, Bernard Levy PS: I am ready to grant that DMT/OFDM is a very complex and power hungry architecture, which is to be used only when the advantages are overwhelming.