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Technology Stocks : LAST MILE TECHNOLOGIES - Let's Discuss Them Here

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To: Bernard Levy who wrote (7735)	7/25/2000 9:40:39 AM
From: Dennis Roth	Read Replies (1) of 12823

This article gives some technical details on Flash OFDM. eetimes.com From article: For the PHY layer, Flarion opted for its own, patented version of OFDM. In Flash OFDM, a signal hops from tone to tone at the rate of roughly 10,000 times per second. Every user ends up signaling across the band on all tones, effectively turning OFDM into a spread-spectrum technology. "Wideband CDMA is also spread-spectrum, but only in the time domain," said Laroia. "Flash OFDM is spread in the frequency domain, so you end up getting all the frequency-diversity advantages and interference-averaging benefits that spread-spectrum offers in the cellular environment." Flash OFDM can be likened to putting time-division multiple access on top of OFDM, yielding all the benefits of both technologies in terms of robustness under mobility and channel-delay spreads, interference averaging from other cells and orthogonality inside the cell.

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