Fast-Decodable MIDO Codes With Large Coding Gain

Srinath, Koteshwar Pavan and Rajan, Balaji Sundar (2014) Fast-Decodable MIDO Codes With Large Coding Gain. In: IEEE TRANSACTIONS ON INFORMATION THEORY, 60 (2). pp. 992-1007.

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Abstract

In this paper, a new method is proposed to obtain full-diversity, rate-2 (rate of two complex symbols per channel use) space-time block codes (STBCs) that are full-rate for multiple input double output (MIDO) systems. Using this method, rate-2 STBCs for 4 x 2, 6 x 2, 8 x 2, and 12 x 2 systems are constructed and these STBCs are fast ML-decodable, have large coding gains, and STBC-schemes consisting of these STBCs have a non-vanishing determinant (NVD) so that they are DMT-optimal for their respective MIDO systems. It is also shown that the Srinath-Rajan code for the 4 x 2 system, which has the lowest ML-decoding complexity among known rate-2 STBCs for the 4x2 MIDO system with a large coding gain for 4-/16-QAM, has the same algebraic structure as the STBC constructed in this paper for the 4 x 2 system. This also settles in positive a previous conjecture that the STBC-scheme that is based on the Srinath-Rajan code has the NVD property and hence is DMT-optimal for the 4 x 2 system.

Item Type:	Journal Article
Publication:	IEEE TRANSACTIONS ON INFORMATION THEORY
Publisher:	IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Additional Information:	Copyright for this article belongs to the IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, USA
Keywords:	Cyclic division algebra (CDA); fast-decodability; Galois group; multiple-input double-output (MIDO) systems; non-vanishing determinant (NVD); space-time block codes (STBCs)
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	06 Mar 2014 06:58
Last Modified:	06 Mar 2014 06:58
URI:	http://eprints.iisc.ac.in/id/eprint/48496

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