Joint Optimal Design for Outage Minimization in DF Relay-assisted Underwater Acoustic Networks

TL;DR

This paper proposes a joint optimal design for relay positioning and power allocation to minimize outage probability in underwater acoustic networks without direct source-destination links, using a novel approximation method and numerical validation.

Contribution

It introduces a joint global-optimal approach for relay placement and power allocation in UANs, along with a low-complexity approximation technique for analytical insights.

Findings

Optimal power allocation and relay placement significantly reduce outage probability.

Numerical results validate the effectiveness of the proposed joint design.

The approximation method provides accurate insights with low computational complexity.

Abstract

This letter minimizes outage probability in a single decode-and-forward (DF) relay-assisted underwater acoustic network (UAN) without direct source-to-destination link availability. Specifically, a joint global-optimal design for relay positioning and allocating power to source and relay is proposed. For analytical insights, a novel low-complexity tight approximation method is also presented. Selected numerical results validate the analysis and quantify the comparative gains achieved using optimal power allocation (PA) and relay placement (RP) strategies.