A Novel Relay-Aided Transmission Scheme in Cognitive Radio Networks

TL;DR

This paper introduces a relay-assisted cooperative transmission scheme in cognitive radio networks that enhances secondary user performance while maintaining primary user protection, supported by analytical derivations and simulations.

Contribution

It proposes a new relay-aided transmission scheme with a power allocation algorithm, improving secondary outage probability without affecting primary users.

Findings

Improved secondary outage probability demonstrated through simulations.

Closed-form expressions for outage probabilities derived.

Power allocation algorithm enhances performance without primary interference.

Abstract

In underlay cognitive radio networks, unlicensed secondary users are allowed to share the spectrum with licensed primary users when the interference induced on the primary transmission is limited. In this paper, we propose a new cooperative transmission scheme for cognitive radio networks where a relay node is able to help both the primary and secondary transmissions. We derive exact closed-form and upper bound expressions of the conditional primary and secondary outage probabilities over Rayleigh fading channels. Furthermore, we proposed a simple power allocation algorithm. Finally, using numerical evaluation and simulation results we show the potential of our cooperative transmission scheme in improving the secondary outage probability without harming the primary one.