# Performance of DF Incremental Relaying with Energy Harvesting Relays in Underlay CRNs

## TL;DR

This paper evaluates the throughput of energy harvesting decode-and-forward relays in underlay cognitive radio networks, showing that combining direct and relayed signals enhances performance, with optimized power-splitting parameters derived.

## Contribution

It provides a closed-form expression for the optimal power-splitting parameter in EH DF relays and analyzes their throughput performance in underlay CRNs.

## Key findings

- Relaying with EH DF relays improves throughput when signals are combined.
- Derived closed-form expression optimizes relay power-splitting.
- Simulations confirm the accuracy of analytical results.

## Abstract

In this paper, we analyze the throughput performance of incremental relaying using energy harvesting (EH) decode-and-forward (DF) relays in underlay cognitive radio networks (CRNs). The destination combines the direct and relayed signals when the direct link is in outage. From the derived closed-form expressions, we present an expression for the power-splitting parameter of the EH relay that optimizes the throughput performance. We demonstrate that relaying using EH DF relays results in better performance than direct signalling without a relay only when the destination combines the direct signal from the source with the relayed signal. Computer simulations demonstrate accuracy of the derived expressions.