Diversity-Multiplexing Tradeoff for the MIMO Static Half-Duplex Relay
Abstract
In this work, we investigate the diversity-multiplexing tradeoff (DMT) of the multiple-antenna (MIMO) static half-duplex relay channel. A general expression is derived for the DMT upper bound, which can be achieved by a compress-and-forward protocol at the relay, under certain assumptions. The DMT expression is given as the solution of a minimization problem in general, and an explicit expression is found when the relay channel is symmetric in terms of number of antennas, i.e. the source and the destination have n antennas each, and the relay has m antennas. It is observed that the static half-duplex DMT matches the full-duplex DMT when the relay has a single antenna, and is strictly below the full-duplex DMT when the relay has multiple antennas. Besides, the derivation of the upper bound involves a new asymptotic study of spherical integrals (that is, integrals with respect to the Haar measure on the unitary group U(n)), which is a topic of mathematical interest in itself.
Cite
@article{arxiv.0812.3404,
title = {Diversity-Multiplexing Tradeoff for the MIMO Static Half-Duplex Relay},
author = {Olivier Leveque and Christophe Vignat and Melda Yuksel},
journal= {arXiv preprint arXiv:0812.3404},
year = {2009}
}
Comments
19 pages, 2 figures, submitted to the IEEE Transactions on Information Theory