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High-Rate Information-Lossless Linear Dispersion STBCs from Group Algebra

Kiran, T and Rajan, Sundar B (2004) High-Rate Information-Lossless Linear Dispersion STBCs from Group Algebra. In: GLOBECOM '04. IEEE Global Telecommunications Conference, 29 November-3 December, Dallas,Texas, Vol.1, 381 -385.


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For multiple-input multiple-output (MIMO) channels, at high spectral efficiencies, space-time block codes (STBC) must be designed to maximize the mutual information between the transmit and receive signals. In an uncoiled scheme (spatial multiplexing or V-BLAST), it is well-known that the Gaussian input distribution maximizes the mutual information. Hassibi and Hochwald (2002) introduced a linear dispersion (LD) framework for designing space-time codes, wherein any transmit codeword is a linear combination of a fixed set of matrices called the weight matrices. A LD space-time block code is said to be information-lossless if it does not disturb the maximum mutual information between the transmit and receive signals. In other words, a MIMO scheme using information-lossless LD space-time block codes has the same capacity as the uncoded scheme. Through computer search, information-lossless LD codes with better diversity compared to the uncoded system were found by Hassibi et al., and also by Heath et al. (2002). We give a general algebraic construction of high-rate information-lossless STBC, both square and rectangular, by restricting the weight matrices to those which form a finite group under matrix multiplication.

Item Type: Conference Paper
Publisher: IEEE
Additional Information: �©1990 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 08 Dec 2005
Last Modified: 19 Sep 2010 04:21
URI: http://eprints.iisc.ac.in/id/eprint/4336

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