Remarks on the criteria of constructing MIMO-MAC DMT optimal codes

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

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

7 Citations (Scopus)


In this paper we investigate the criteria proposed by Coronel et at. for constructing MIMO MAC-DMT optimal codes over several classes of fading channels. We first show by a counterexample that their DMT result might not be correct when the channel has selective fading. For the case of symmetric MIMO-MAC flat fading channels, we study their criteria for constructing MAC-DMT optimal codes when the number of receive antennas is sufficiently large. We show their criterion is equivalent to requiring the codes of any subset of users to satisfy a joint non-vanishing determinant criterion when operating in the antenna pooling regime. Finally an upper bound on the product of minimum eigenvalues of the difference matrices is provided, and is used to show MIMO-MAC lattice codes satisfying their criterion exist only when the target multiplexing gain is small.

Original languageEnglish
Title of host publicationIEEE Information Theory Workshop 2010, ITW 2010
Publication statusPublished - 2010
MoE publication typeA4 Article in a conference publication
EventIEEE Information Theory Workshop - Cairo, Egypt
Duration: 6 Jan 20108 Jan 2010


WorkshopIEEE Information Theory Workshop
Abbreviated titleITW


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