Capacity region of multiple access relay channels with orthogonal components

In this paper, we introduce multiple access relay channel with orthogonal components from the senders to the relay receiver and from the senders and relay to the receiver. Our model is motivated by the practical constraint in wireless communications that a node cannot send and receive at the same time or in the same frequency band. For this model, we derive a capacity region. Superposition block Markov encoding and multiple access channel encoding and decoding strategies are used to prove the results and then we extend the results to the Gaussian case.