Link Adaptation with Untrusted Relay Assignment: Design and Performance Analysis

TL;DR

This paper introduces the LAURA framework for secure, efficient wireless communication using untrusted relays, optimizing rate and power allocation for reliability and security.

Contribution

It proposes novel link adaptation and relay assignment schemes that enhance security and spectral efficiency in the presence of untrusted relays.

Findings

Power adaptation at the source improves spectral efficiency.

Relay selection based on SNR balances performance and complexity.

LAURA schemes outperform traditional methods in security and efficiency.

Abstract

In this paper, a link adaptation and untrusted relay assignment (LAURA) framework for efficient and reliable wireless cooperative communications with physical layer security is proposed. Using sharp channel codes in different transmission modes, reliability for the destination and security in the presence of untrusted relays (low probability of interception) are provided through rate and power allocation. Within this framework, several schemes are designed for highly spectrally efficient link adaptation and relay selection, which involve different levels of complexity and channel state information requirement. Analytical and simulation performance evaluation of the proposed LAURA schemes are provided, which demonstrates the effectiveness of the presented designs. The results indicate that power adaptation at the source plays a critical role in spectral efficiency performance. Also, it is shown that relay selection based on the signal to noise ratio of the source to relays channels provides an interesting balance of performance and complexity within the proposed LAURA framework.