DMT optimal codes constructions for multiple-access MIMO channel

Hsiao Feng Lu*, Camilla Johanna Hollanti, Roope Iikanpoika Vehkalahti, Jyrki Lahtonen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

17 Citations (Scopus)

Abstract

Explicit code constructions for multiple-input multiple-output (MIMO) multiple-access channels (MAC) with K users are presented in this paper. The first construction is dedicated to the case of symmetric MIMO-MAC where all the users have the same number of transmit antennas nt and transmit at the same level of per-user multiplexing gain r. Furthermore, we assume that the users transmit in an independent fashion and do not cooperate. The construction is systematic for any values of K, nt and r. It is proved that this newly proposed construction achieves the optimal MIMO-MAC diversity-multiplexing gain tradeoff (DMT) provided by Tse at high-SNR regime. In the second part of the paper we take a further step to investigate the MAC-DMT of a general MIMO-MAC where the users are allowed to have different numbers of transmit antennas and can transmit at different levels of multiplexing gain. The exact optimal MAC-DMT of such channel is explicitly characterized in this paper. Interestingly, in the general MAC-DMT, some users might not be able to achieve their single-user DMT performance as in the symmetric case, even when the multiplexing gains of the other users are close to 0. Detailed explanations of such unexpected result are provided in this paper. Finally, by generalizing the code construction for the symmetric MIMO-MAC, explicit code constructions are provided for the general MIMO-MAC and are proved to be optimal in terms of the general MAC-DMT.

Original languageEnglish
Article number5773069
Pages (from-to)3594-3617
Number of pages24
JournalIEEE Transactions on Information Theory
Volume57
Issue number6
DOIs
Publication statusPublished - Jun 2011
MoE publication typeA1 Journal article-refereed

Keywords

  • Cyclic division algebras (CDAs)
  • diversity-multiplexing gain tradeoff (DMT)
  • multiple access channel (MAC)
  • multiple-input multiple-output (MIMO) channel
  • space-time block codes (STBCs)

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