Sub-optimality of Han-Kobayashi achievable region for interference channels
Sub-optimality of Han-Kobayashi achievable region for interference channels
Han-Kobayashi achievable region forms the best known inner bound for a general discrete memoryless interference channel. We show that the capacity region can be strictly larger than the Han-Kobayashi region for some channel realizations, and hence the strict sub-optimality of Han-Kobayashi achievable region.