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markhahn0
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re: Wireless window contacts benefit from energy harvesting sensors
markhahn0   10/17/2011 7:33:05 PM
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this makes a lot of sense to me - many "mote" type sensors could have quite low duty cycles and very rare communication. I always wonder about RF power harvesting, though: if I'm extracting power from a particular RF band, does that mean I'm hurting the propagation properties of anyone using that range of RF? does a harvester create a local RF hole, which might become more of a shadow for higher frequencies that need LOS?

pixies
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re: Wireless window contacts benefit from energy harvesting sensors
pixies   10/18/2011 1:36:04 PM
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If this technology is applied a every window, will it severely interfere with the radio signal?

DrQuine
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re: Wireless window contacts benefit from energy harvesting sensors
DrQuine   10/19/2011 9:02:57 PM
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It sounds like this technology "they can tell from the position of the handle whether the window is wide open, tilted open or closed" works on windows that crank open but not on common sash windows. Perhaps a version with magnetic contacts could detect the state of sliding windows. The biggest issue, however, is reliability. As the number of battery / energy harvesting sensor devices multiply in the house, homeowners become service engineers debugging and repairing failed sensors rather than the beneficiaries of the new technologies. When there are 100 sensors in the house, even a low failure rate becomes intolerable.



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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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