Gaussian multiple-access relay channels with non-causal side information at the transmitters

Abstract

The multiple-access relay channel (MARC) and its Gaussian version are important models in cellular, ad hoc communication systems, and sensor networks and also, this channel is a comprehensive model which consist of two important channels: Relay Channel (RC) and Multiple Access Channel (MAC). In this paper, we study and analyse the two-user state-dependent discrete and memoryless MARC in which the independent states of channel are known non-causally only at the encoders. An achievable rate region by using binning and decode-and-forward (DF) schemes and an outer bound for this model are obtained. We also by using our results obtain an inner bound for two-user Gaussian MARC with identical non-causal side information. Our model includes discrete and continuous (Gaussian) multiple access channel rate region and relay channel rate with non-causal side information. Finally, we evaluate our bounds for Gaussian MARC numerically and illustrate the effect of interference power on bounds.