A Case For Amplify-Forward Relaying in the Block-Fading Multi-Access Channel
Abstract
This paper demonstrates the significant gains that multi-access users can achieve from sharing a single amplify-forward relay in slow fading environments. The proposed protocol, namely the multi-access relay amplify-forward, allows for a low-complexity relay and achieves the optimal diversity-multiplexing trade-off at high multiplexing gains. Analysis of the protocol reveals that it uniformly dominates the compress-forward strategy and further outperforms 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 system, and at low multiplexing gains, it provides each user with the same diversity-multiplexing trade-off as if there is no contention for the relay from the other users.
Keywords
Cite
@article{arxiv.cs/0701053,
title = {A Case For Amplify-Forward Relaying in the Block-Fading Multi-Access Channel},
author = {Deqiang Chen and Kambiz Azarian and J. Nicholas Laneman},
journal= {arXiv preprint arXiv:cs/0701053},
year = {2009}
}