A Case for Amplify–Forward Relaying in the Block-Fading Multiple-Access Channel

Authors:
Deqiang Chen;K. Azarian;J. N. Laneman
Affiliations:
Dept. of Electr. Eng., Univ. of Notre Dame, Notre Dame, IN;-;-
Venue:
IEEE Transactions on Information Theory
Year:
2008

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Abstract

This correspondence demonstrates the significant gains that multiple-access users can achieve from sharing a single amplify-forward relay in slow-fading environments. The proposed protocol, namely, multiple-access amplify-forward (MAF), allows for a low-complexity relay and achieves the optimal diversity-multiplexing tradeoff (DMT) at high multiplexing gains. Analysis of the protocol further reveals that it outperforms both the compress-forward strategy at low multiplexing gains and the dynamic decode-forward protocol at high multiplexing gains. An interesting feature of the proposed protocol is that, at high multiplexing gains, it resembles a multiple-input single-output (MISO) system, and at low multiplexing gains, it provides each user with the same DMT as if there were no contention for the relay from the other users.