Abstract
© 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. This paper studies the optimization of power control for the two-user interference channel in which the terminals are time-switched between the communication and energy-harvesting phases. The objective is to maximize the sum-rate, subject to the minimum data and harvested energy constraints at the receivers, assuming a fixed time-switching coefficient. Our key contribution is a geometric approach that analyzes the feasible region governed by the constraints, which gives rise to the optimal power control solution. We assume that perfect channel state information (CSI) is available at both transmitters to determine the solution.
Highlights
I N RECENT years, green communications has been a main research theme in wireless communications, with an ever increasing focus on energy efficiency [1]
In this paper, we investigate the two-user interference channel where both users operate synchronously in fixed time-switching manner, for wireless information transfer (WIT) and wireless power transfer (WPT)
Altogether, there are more than 48 possible shapes of the feasible region depending upon how the lines combine within Π, if both rate and energy harvesting constraints are considered
Summary
I N RECENT years, green communications has been a main research theme in wireless communications, with an ever increasing focus on energy efficiency [1]. Given the CSI at the transmitter, the joint optimization of transmit power control, information and energy transfer scheduling, and the receiver’s mode switching was studied based on the instantaneous CSI and interference conditions. In this paper, we investigate the two-user interference channel where both users operate synchronously in fixed time-switching manner, for wireless information transfer (WIT) and wireless power transfer (WPT). Both users are subject to individual data and energy harvesting requirements, while aiming for maximizing their channel sum-rate. Assuming a fixed prescribed time-switching factor, our problem of interest is to find the optimal power control for both users to achieve this, given perfect channel state information (CSI).
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