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Wireless networks can be self-sustaining by harvesting energy from Radio-Frequency (RF) signals. Building on classic cognitive radio networks, the authors propose a novel method for network coexisting where mobiles from a secondary network, called Secondary Transmitters (STs), either harvest energy from transmissions by nearby transmitters from a primary network, called Primary Transmitters (PTs), or transmit information if PTs are sufficiently far away; STs store harvested energy in rechargeable batteries with finite capacity and use all available energy for subsequent transmission when batteries are fully charged.
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