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Author Gurakan, Berk ♦ Ozel, Omur ♦ Yang, Jing ♦ Ulukus, Sennur
Source CiteSeerX
Content type Text
File Format PDF
Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science
Subject Keyword Energy Cooperation ♦ Energy Harvesting ♦ Energy Arrival Profile ♦ Several Basic Multi-user Network Structure ♦ Two-dimensional Directional Water-filling Algorithm ♦ Twoway Channel ♦ Energy Harvesting Communication ♦ Relay Channel ♦ Energy-receiving Node ♦ Multiple Access Channel ♦ Harvested Energy ♦ Optimum Transmit Policy ♦ Kkt Optimality Condition ♦ Lagrangian Formulation ♦ Energy Arrival ♦ Energy Transfer ♦ Overall System Performance ♦ Generalized Version ♦ Two-way Channel ♦ Wireless Energy Transfer Capability ♦ Capacity Region ♦ Energy Management Policy
Abstract In energy harvesting communications, users transmit messages using energy harvested from nature during the course of communication. With an optimum transmit policy, the performance of the system depends only on the energy arrival profiles. In this paper, we introduce the concept of energy cooperation, where a user wirelessly transmits a portion of its energy to another energy harvesting user. This enables shaping and optimization of the energy arrivals at the energy-receiving node, and improves the overall system performance, despite the loss incurred in energy transfer. We consider several basic multi-user network structures with energy harvesting and wireless energy transfer capabilities: relay channel, twoway channel and multiple access channel. We determine energy management policies that maximize the system throughput within a given duration using a Lagrangian formulation and the resulting KKT optimality conditions. We develop a two-dimensional directional water-filling algorithm which optimally controls the flow of harvested energy in two dimensions: in time (from past to future) and among users (from energy-transferring to energy-receiving) and show that a generalized version of this algorithm achieves the boundary of the capacity region of the two-way channel.
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research
Education Level UG and PG ♦ Career/Technical Study
Publisher Date 2013-01-01