The sum rate optimality of the naïve FDM for the Gaussian Interference Channel within a computable Han-Kobayashi subregion

The general Han and Kobayashi (HK) region is not computable for the Gaussian Interference Channel. A modified (i.e., non-naïve) FDM/TDM method was proposed in [1] that remains the largest computable achievable region to date. In this paper, we show that the naïve FDM/TDM turns out to be sum rate optimal for a certain range of channel parameters within this class of computable achievable region.

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