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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. The authors further propose a low-complexity, optimal power allocation strategy to maximize the data rate of the proposed relay strategy. Simulation results suggest that their 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.
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