On the Average Achievable Rate of Block Fading Decentralized Interference Channel

This paper aims to explore the average achievable rate of two-user decentralized Gaussian interference channel in a non-ergodic block fading environment, assuming the channel gains are constant throughout one transmission block and vary independently for the next block. It is assumed the channel gains are not available at the transmitters, while direct and cross channel gains are perfectly available at the corresponding receivers. In this regard, under Gaussian codebook assumption and considering the signal arising from the other co-channel communication link is treated as an interference, a multi-layer coding strategy is exploited at each transmitter. Then, under individual transmit power constraints and in a Rayleigh block fading environment, the optimum power allocation across code layers is derived, showing the average achievable rate of using multi-layer coding outperforms that of using a single layer code.