Optimal Power Allocation for Two-Way Decode-and-Forward OFDM Relay Networks

TL;DR

This paper introduces a novel two-way decode-and-forward OFDM relay strategy with joint channel coding and an optimal power allocation scheme, significantly improving data rates over existing methods in relay networks.

Contribution

The paper proposes a new two-way DF relay strategy with multi-subcarrier coding and an optimal power allocation method for OFDM networks, enhancing data throughput.

Findings

Achieves higher data rates than conventional per-subcarrier DF strategies.

Outperforms amplify-and-forward relay strategies in various SNR conditions.

Provides a low-complexity optimal power allocation solution.

Abstract

This paper presents a novel two-way decode-and-forward (DF) relay strategy for Orthogonal Frequency Division Multiplexing (OFDM) relay networks. This DF relay strategy employs multi-subcarrier joint channel coding to leverage frequency selective fading, and thus can achieve a higher data rate than the conventional per-subcarrier DF relay strategies. We further propose a low-complexity, optimal power allocation strategy to maximize the data rate of the proposed relay strategy. Simulation results suggest that our strategy obtains a substantial gain over the per-subcarrier DF relay strategies, and also outperforms the amplify-and-forward (AF) relay strategy in a wide signal-to-noise-ratio (SNR) region.