The capacity region of a class of discrete additive degraded interference channels (Corresp.)

A single-letter characterization of the capacity region for a class of discrete degraded interference channels (IFC's) is determined. This class of degraded IFC's has an additive structure similar to that of a class of degraded Gaussian IFC's. The capacity region for this class of degraded IFC's is shown to be also the capacity region of a related class of degraded broadcast channels (DBC's). The singie-letter characterization obtained for this region simplifies the computation of the capacity region of this related class of DBC's.