Multilevel Coding over Two-Hop Single-User Networks

TL;DR

This paper proposes a multilevel coding scheme for two-hop single-user networks with static fading channels, demonstrating optimality and power allocation strategies under no CSI at transmitters.

Contribution

It introduces a continuum of multilevel codes combined with decode-and-forward, optimizing power allocation for improved performance in fading channels.

Findings

Multilevel coding with decode-and-forward is optimal for the considered setup.

The proposed power allocation scheme enhances the average received rate.

Performance comparisons show improvements over existing strategies.

Abstract

In this paper, a two-hop network in which information is transmitted from a source via a relay to a destination is considered. It is assumed that the channels are static fading with additive white Gaussian noise. All nodes are equipped with a single antenna and the Channel State Information (CSI) of each hop is not available at the corresponding transmitter. The relay is assumed to be simple, i.e., not capable of data buffering over multiple coding blocks, water-filling over time, or rescheduling. A commonly used design criterion in such configurations is the maximization of the average received rate at the destination. We show that using a continuum of multilevel codes at both the source and the relay, in conjunction with decode and forward strategy at the relay, performs optimum in this setup. In addition, we present a scheme to optimally allocate the available source and relay powers to different levels of their corresponding codes. The performance of this scheme is evaluated assuming Rayleigh fading and compared with the previously known strategies.