The performance of wireless powered communication networks (WPCNs) with transmitters (TEs) self-sustained by opportunistically harvesting radio-frequency (RF) energy from nearby power beacons (PBs) is investigated. A ``harvest-then-transmit'' protocol is considered, under which a TE first harvest the wireless energy from its nearest PB and then send information to its associated receiver (RE) with the energy stored in the battery. A variable power transmission mode is proposed that the TE is allowed to transmit as long as its harvested energy is larger than a predefined transmission threshold. The transmission probability of the TEs is derived. The coverage probability with the TEs non-fully charged and fully charged, respectively, are characterized. By using numerical analysis, we study the tradeoff between energy harvesting and data transmission for different system parameters, such as energy harvest-ratio, transmission threshold, and PB density. Simulation results are provided to validate our theoretical analysis.
Coverage Characterization in Wireless Powered Communication Networks with Energy Harvesting
01.09.2015
365511 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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