# Joint Optimization of Power Splitting and Allocation for SWIPT in Interference Alignment Networks

## TL;DR

This paper jointly studies interference alignment and SWIPT in wireless networks, deriving bounds, proposing user selection and power-splitting algorithms, and demonstrating improved performance through simulations.

## Contribution

It introduces a unified framework for IA and SWIPT, deriving bounds and designing algorithms for user selection and power splitting to enhance wireless power and information transfer.

## Key findings

- Derived upper bound of harvested power in IA networks
- Proposed SWIPT-user selection algorithms for IA networks
- Designed power-splitting optimization and power allocation algorithms

## Abstract

Interference alignment (IA) is a promising solution for interference management in wireless networks. On the other hand, simultaneous wireless information and power transfer (SWIPT) has become an emerging technique. Although some works have been done on IA and SWIPT, these two important areas have traditionally been addressed separately in the literature. In this paper, we propose to use a common framework to jointly study IA and SWIPT. We analyze the performance of SWIPT in IA networks. Specifically, we derive the upper bound of the power that can be harvested in IA networks. In addition, we show that, to improve the performance of wireless power transfer and information transmission, users should be dynamically selected as energy harvesting (EH) or information decoding (ID) terminals. Furthermore, we design two easy-implemented SWIPT-user selection (SWIPT-US) algorithms in IA networks. To optimize the ID and EH performance of SWIPT in IA networks, a power-splitting optimization (PSO) algorithm is proposed when power splitters are available, and its closed-form optimal solutions are derived. Power allocation in the PSO algorithm is also studied to further optimize the performance. Simulation results are presented to show the effectiveness of the proposed algorithms.