On the Dispersions of the Discrete Memoryless Interference Channel
In this paper, achievable dispersions for the Discrete Memoryless Interference Channel (DM-IC) are derived. In other words, they characterize the backoff from the Han-Kobayashi (HK) achievable region, the largest inner bound known to date for the DM-IC. In addition, they also characterize the backoff from Sato's region in the strictly very strong interference regime, and the backoff from Costa and El Gamal's region in the strong interference regime. To do so, Feinstein's lemma is first generalized to be applicable to the interference channel.