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In this correspondence, we derive a simplified description of the Han–Kobayashi rate region for the general interference channel. Using this result, we establish that the recently discovered Chong–Motani–Garg rate region is a new representation of the Han–Kobayashi region. Moreover, a tighter bound for the cardinality of the time-sharing auxiliary random variable emerges from our simplified description.
Chong et al. (Mon,) studied this question.