2016/09/16 by Tewodros A. Zewde, Zewde, Tewodros A., M. Cenk Gursoy +1
Computer Science · Engineering · Mathematics · #Advanced MIMO Systems Optimization #Energy Harvesting in Wireless Networks #FOS: Computer and information sciences #Information Theory (cs.IT) #Wireless Power Transfer Systems #cs.IT #math.IT
paper · pdf · doi:10.48550/arxiv.1609.05160
6 pages, 7 figures, presented at CISS 2016
arxiv created 2016/09/16 · openalex publication_date 2016/09/16 · arxiv updated 2016/09/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In this paper, we study optimal resource allocation strategies for simultaneous information and power transfer (SWIPT) focusing on the system energy efficiency. We consider two-user multiple access channels in which energy harvesting (EH) and information decoding (ID) nodes are spatially separated. We formulate optimization problems that maximize system energy efficiency while taking harvested energy constraints into account. These are concave-linear fractional problems, and hence Karush-Kuhn-Tucker (KKT) conditions are necessary and sufficient to obtain globally optimal solution. Solving these optimization problems, we provide analytical expressions for optimal transmit power allocation among the source nodes, and identify the corresponding energy efficiency. We confirm the theoretical analysis via numerical results. Furthermore, we also characterize the effect of circuit power consumption on the system's efficiency as the harvested energy demand varies.