# Throughput Optimization for Wireless Powered Interference Channels

## TL;DR

This paper develops iterative algorithms to optimize throughput in multi-user wireless powered interference channels by jointly designing energy transfer, information transfer, and power allocation, considering practical imperfections.

## Contribution

It introduces a novel joint design framework with efficient algorithms for throughput maximization in wireless powered interference channels, accounting for imperfect CSI and circuit non-linearity.

## Key findings

- Algorithms achieve high-quality solutions in simulations.
- Joint design improves throughput compared to baseline methods.
- Effective under various practical conditions.

## Abstract

This paper studies a general multi-user wireless powered interference channel (IFC) under the harvest-then-transmit protocol, where the communication in channel coherence time consists of two phases, namely wireless energy transfer (WET) and wireless information transfer (WIT). In the first phase, all energy transmitters (ETs) transmit energy signals to information transmitters (ITs) via collaborative waveform design, while in the second phase, each IT transmits an information signal to its intended ET using the harvested energy in the previous phase. The aim is to jointly design the WET-WIT time allocation, the (deterministic) transmit signal at the first phase, and the transmit power of ITs in the second phase to optimize the network throughput. The design problems are non-convex and hence difficult to solve globally. To deal with them, we propose efficient iterative algorithms based on alternating projections; then, the majorization-minimization technique is used to tackle the nonconvex sub-problems in each iteration. We also extend the devised design methodology by considering imperfect channel state information (CSI) and non-linearity in energy harvesting circuit. The proposed algorithms are locally convergent and can provide high-quality suboptimal solutions to the design problems. Simulation results show the effectiveness of the proposed algorithms under various setups.