Two Novel Channel-Augmentation Schemes for MIMO Systems

TitleTwo Novel Channel-Augmentation Schemes for MIMO Systems
Publication TypeJournal Article
Year of Publication2007
AuthorsChen, H. Z. B., R. Schober, and L. Lampe
JournalSignal Processing Letters, IEEE
Pagination601 -604
Date Publishedsep.
Keywordsantenna arrays, channel correlation, channel-augmentation scheme, conjugate virtual antenna, CVA scheme, fading channel, fading channels, MIMO communication, MIMO system, multiple-input multiple-output system, real virtual antenna, receive antenna, RVA scheme, transmit antenna

Recently, Rankin, Taylor, and Martin (RTM) have proposed a simple channel-augmentation scheme for multiple-input multiple-output (MIMO) systems. They have shown that the virtual receive antennas created by repeating the same transmit symbols several times can improve the outage rate of slow MIMO fading channels, especially if the number of transmit antennas is smaller than the number of receive antennas. Inspired by the RTM paper, we propose in this paper two channel-augmentation schemes having the same low complexity as the RTM scheme. In the first, the transmitted symbols are both repeated and complex conjugated leading to the conjugate virtual antenna (CVA) scheme. In the second, the transmitted symbols are constrained to be real-valued leading to the real virtual antenna (RVA) scheme. We show that the RTM, CVA, and RVA schemes can achieve a higher outage rate than the baseline scheme without augmentation for both V-BLAST and D-BLAST. The novel RVA and CVA schemes are seen to be more robust to channel correlation than the RTM scheme.


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