The Capacity Region of Gaussian Fading Multiple Access Relay Channels with Orthogonal Components

In this paper, we investigate the capacity problem of Gaussian fading multiple access relay channel with orthogonal components from the senders to the relay receiver and from the senders and relay to the receiver. This model is motivated by the practical constraint that a node cannot send and receive at the same time or in the same frequency band. We derive a capacity region for the model where partial Channel State Information (CSI) is available at the transmitters (CSIT) and perfect CSI is available at the receiver (CSIR). Superposition block Markov encoding and multiple access channel encoding and decoding strategies are used to prove the results. Keywordsadditive white Gaussian noise; Gaussian fading channels; channel state information; discrete multiple access relay channel; orthogonal components; discrete multiple access relay channel.