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tb100
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Hey!
tb100   8/11/2014 10:05:50 PM
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" By culling energy from existing radio, TV, and wireless signals, they've developed a way to connect low-energy devices, such as sensors and wearables, to the Internet without the need for batteries or power cords."

 

Hey! I just mentioned that idea a week ago in a comment! How did they develop it so fast?

Just kidding--obviously they came up with idea before me.  This would be great for stress sensors on bridges and buildings. They are very low-power and low speed, so they need almost no power. They could slowly build up enough energy to be able to send out their data when needed.

 

resistion
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Re: Wireless Power (Unintended)
resistion   8/11/2014 9:09:01 PM
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I agree, mobile IoT devices would benefit from harvesting more, but since these are personal items it can be derived from the personal activity, i.e., swinging motions.

chanj0
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Wireless Power (Unintended)
chanj0   8/11/2014 8:59:16 PM
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Idea sounds brilliant. Challenge is how much can be drawn from WiFi signal that is intended for other purpose. Would it make more sense to draw power from other means such as solar or thermo? On the other hands, for indoor use, I am not too sure energy harvesting is crucial to the future of IoT. I can see outdoor IoT definitely demands energy harvesting though.

resistion
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wifi traffic
resistion   8/11/2014 7:06:07 PM
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With so many devices drawing energy from same source, it's obvious there will be loading issues similar to bandwidth issues. Less energy for devices which connect later.

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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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