Energy Harvesting for Secure OFDMA Systems

TL;DR

This paper investigates energy harvesting and physical-layer security in OFDMA systems, proposing an efficient algorithm for optimizing power splitting and subcarrier allocation to maximize harvested energy while ensuring secrecy.

Contribution

It introduces a novel approach to optimize simultaneous wireless information and power transfer with security constraints in OFDMA systems.

Findings

Proposed algorithm outperforms conventional methods.

Maximized harvested energy while satisfying secrecy requirements.

Efficient solution for a complex NP-hard problem.

Abstract

Energy harvesting and physical-layer security in wireless networks are of great significance. In this paper, we study the simultaneous wireless information and power transfer (SWIPT) in downlink orthogonal frequency-division multiple access (OFDMA) systems, where each user applies power splitting to coordinate the energy harvesting and information decoding processes while secrecy information requirement is guaranteed. The problem is formulated to maximize the aggregate harvested power at the users while satisfying secrecy rate requirements of all users by subcarrier allocation and the optimal power splitting ratio selection. Due to the NP-hardness of the problem, we propose an efficient iterative algorithm. The numerical results show that the proposed method outperforms conventional methods.