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hottechgirl
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re: Viewpoint: Staccato CEO on the future of UWB
hottechgirl   2/27/2009 12:49:41 AM
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Yes, the WiMedia Alliance promotes multiband OFDM (MB-OFDM) which conforms to the FCC definition for UWB. It not only retains the benefits of OFDM but its wide-band nature allows for very high data rates and its low power enables coexistence with other technologies without causing harmful interference. Coexistence is indeed a regulatory issue but, as the article states, the US, Japan, Korea, EU and China have now given their approval, and available UWB solutions now support worldwide operation. Impulse-based UWB solutions have been compared to the MB-OFDM approach many times before. For example, here is an overview from 2003, which argues for multiband OFDM: http://www.commsdesign.com/showArticle.jhtml?articleID=16501259 The advantages of MB-OFDM for short range, low cost, high bit rate applications were recognized by the industry and adopted by the WiMedia Alliance and Wireless USB. There is still some work done on impulse radios in academia, but there don?t seem to be any commercially available products.

Patrick Mannion
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re: Viewpoint: Staccato CEO on the future of UWB
Patrick Mannion   2/21/2009 1:23:18 PM
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This is no knock on UWB, but here's the question: Isn't the current form of UWB, as delivered by the WiMedia Alliance and it's supporters, just low-power, 'wideband OFDM' carved to meet the FCC spectral mask? As such, it has all the benefits -- and problems -- of regular OFDM -- but with many more regulatory issues? The original impulse UWB had inherent characteristics that helped it stand out and differentiate it in the market, vs the current form. Anyone have any thoughts, comments on this? Does it even matter anymore if impulse UWB seems to be dead in the water? Does anyone care for the characteristics of the original, pre-FCC-standard definition of UWB?



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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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