Approaching the Capacity of the Interference Channel through Rate-Splitting

A distributed rate-splitting (DRS) scheme is proposed to approach the rate region boundary of the two-user Gaussian interference channel. It is shown that the DRS scheme can be formulated as a non-cooperative game. Therefore, an iterative multiple waterlevels water-filling algorithm (IML-WFA) is developed to efficiently reach the Nash equilibrium (NE) of the non-cooperative game and a sufficient condition on the convergence of IML-WFA is proposed. Numerical examples show that the rate-tuples achieved by the DRS are very close to the boundary of the well-known HK regions.