Title: Remarks on Diversity-Multiplexing Tradeoffs for Multiple-Access and Point-to-Point MIMO Channels
Authors: Lu, Hsiao-Feng (Francis)
Department of Electrical and Computer Engineering
Keywords: Diversity-multiplexing gain tradeoff (DMT);multiple access channel (MAC);multiple-input multiple-output (MIMO) channel;space-time block codes (STBCs)
Issue Date: 1-Feb-2012
Abstract: In this paper, we answer several open questions related to diversity-multiplexing tradeoffs (DMTs) for point-to-point and multiple-access (MAC) MIMO channels. By analyzing the DMT performance of a simple code, we show that the optimal MAC-DMT holds even when the channel remains fixed for less than K n(t) + n(r) - 1 channel uses, where K is the number of users, n(t) is the number of transmit antennas of each user, and n(r) is the number of receive antennas at receiver. We also prove that the simple code isMAC-DMT optimal. A general code design criterion for constructing MAC-DMT optimal codes that is much more relaxed than the previously known design criterion is provided. Finally, by changing some design parameters, the simple code is modified for use in point-to-point MIMO channels. We show the modified code achieves the same DMT performance as the Gaussian random code.
URI: http://dx.doi.org/10.1109/TIT.2011.2173250
ISSN: 0018-9448
DOI: 10.1109/TIT.2011.2173250
Volume: 58
Issue: 2
Begin Page: 858
End Page: 863
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