Energy-Efficient Resource Allocation for SWIPT in Multiple Access Channels

TL;DR

This paper develops optimal resource allocation strategies for SWIPT in two-user multiple access channels, maximizing energy efficiency while considering harvested energy constraints and circuit power consumption.

Contribution

It provides analytical solutions for optimal power allocation in SWIPT systems with separated EH and ID nodes, enhancing energy efficiency analysis.

Findings

Optimal power allocation formulas derived

Energy efficiency increases with harvested energy constraints

Circuit power consumption significantly impacts system efficiency

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.