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A multiple access relay channel (MARC) is considered in which ananalogue-like network coding is implemented in the relay node. This analoguecoding is a simple addition of the received signals at the relay node. Using"nulling detection" structure employed in V-BLAST receiver, we propose adetection scheme in the destination which is able to provide a diversity orderof two for all users. We analytically evaluate the performance of our proposedscheme for the MARC with two users where tight upper bounds for both uncodedand Convolutionally coded transmission blocks are provided. We verify ouranalytical evaluations by simulations and compare the results with those ofnoncooperative transmission and Alamouti's scheme for the same power and ratetransmission. Our results indicate that while our proposed scheme shows acomparable performance compared to the Alamouti's scheme, it substantiallyoutperforms the non-cooperate transmission.

A Cooperative MARC Scheme Using Analogue Network Coding to Achieve Second-Order Diversity