Effective Optimization Criteria and Relay Selection Algorithms for Physical-Layer Security in Multiple-Antenna Relay Networks

TL;DR

This paper proposes new relay selection algorithms and optimization criteria for physical-layer security in multi-antenna relay networks, enhancing secrecy rates without requiring eavesdropper channel knowledge.

Contribution

It introduces alternative optimization criteria and relay selection algorithms that improve secrecy performance without needing eavesdropper channel information.

Findings

Proposed criteria outperform existing methods in secrecy rate.

Algorithms achieve high secrecy rates with limited channel knowledge.

Simulation results confirm the effectiveness of the proposed approaches.

Abstract

Physical-layer security for wireless networks has become an effective approach and recently drawn significant attention in the literature. In particular, the deployment and allocation of resources such as relays to assist the transmission have gained significant interest due to their ability to improve the secrecy rate of wireless networks. In this work, we examine relay selection criteria with arbitrary knowledge of the channels of the users and the eavesdroppers. We present alternative optimization criteria based on the signal-to-interference and the secrecy rate criteria that can be used for resource allocation and that do not require knowledge of the channels of the eavesdroppers and the interference. We then develop effective relay selection algorithms that can achieve a high secrecy rate performance without the need for the knowledge of the channels of the eavesdroppers and the interference. Simulation results show that the proposed criteria and algorithms achieve excellent performance.