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Sascha Friedrich

Turning the tables on wireless interference | MIT News - 0 views

  • Cognitive coexisting radio (CCR) technology
  • Another more popular way to reduce interference is to make the small cells “public” so that they support traffic from any local user
  • cognitive radio variant called opportunistic interference avoidance
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  • A third commonly adopted technique is to divide available spectrum among all transmitters in a given area by allotting time/frequency slots available to the operator.
  • adaptively
  • are not being used at that moment
  • frequencies
  • “The CCR system monitors the power and the rates of the other transmitters to understand their use of the spectrum,” she explains. “It predicts when its presence is likely to cause little harm, then makes use of the channels occupied by likely oblivious links, all while watching to see if the existing link adapts too much. If the other users react too much, it can play nice, by going away or reducing its power. If they react just a little, the system will conclude that it’s okay to coexist with these links.”
  • learning capability
  • sidewalk
Sascha Friedrich

usb - Could HDMI be potentially used as a power supply alternative for smartphones? - E... - 0 views

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    "two while the device itself is off"
Sascha Friedrich

Why 'whispers' among bees sometimes evolve into 'shouts' - 0 views

  • In the case of bees and other pollinators, he says, "a network of signals and cues shapes pollination, informing animals about where and when food is available. Researchers have in general thought about eavesdropping as a force that makes signals less conspicuous, leading to the evolution of 'whispers' to counter spying. However, we show that eavesdropping can also lead to 'shouts.' In this stingless bee system, with aggressive colonies jockeying for limited resources, more conspicuous food-recruitment signals indicate a higher likelihood that a resource will be harder to wrest away."
  • But Lichtenberg found in a controlled field study that the eavesdropping species will avoid desirable sources of food that have been visited frequently by T. spinipes (communicated by the larger number of pheromone markings at the site) to avoid being attacked
  • "Assembling such a group in the nest after having found a food source through eavesdropping uses time and energy the eavesdropper could otherwise spend looking for an unoccupied food source,
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  • explains Lichtenberg. "If the eavesdropper brings too small a group to an occupied food source and cannot win access to it, she and the bees accompanying her have essentially wasted energy. For attacks between colonies of the same species, there is also a risk that the conflict will escalate to physical interactions in which large numbers of bees may die."
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