Abstract
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.
Original language | English (US) |
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Title of host publication | 2016 50th Annual Conference on Information Systems and Sciences, CISS 2016 |
Publisher | Institute of Electrical and Electronics Engineers Inc. |
Pages | 246-251 |
Number of pages | 6 |
ISBN (Electronic) | 9781467394574 |
DOIs | |
State | Published - Apr 26 2016 |
Event | 50th Annual Conference on Information Systems and Sciences, CISS 2016 - Princeton, United States Duration: Mar 16 2016 → Mar 18 2016 |
Other
Other | 50th Annual Conference on Information Systems and Sciences, CISS 2016 |
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Country/Territory | United States |
City | Princeton |
Period | 3/16/16 → 3/18/16 |
Keywords
- Energy efficiency
- Multiple access
- Throughput
- Wireless information and power transfer
ASJC Scopus subject areas
- Computer Networks and Communications
- Information Systems