Optimising quasi-orthogonal STBC through group-constrained linear transformation

Author

Yuen, C. ; Guan, Y.L. ; Tjhung, T.T.

Author_Institution

Inst. for Infocomm Res.

Volume

1

Issue

3

fYear

2007

fDate

6/1/2007 12:00:00 AM

Firstpage

373

Lastpage

381

Abstract

The generic algebraic structure of a quasi-orthogonal space-time block code (QO-STBC) has been derived, and group-constrained linear transformation (GCLT) as a mean to optimise the diversity and coding gains of a QO-STBC with square or rectangular QAM constellations has been proposed. Compared with QO-STBC with constellation rotation (CR), QO-STBC with GCLT requires only half the number of symbols for joint detection, hence lower maximum-likelihood decoding complexity. The optimum GCLT parameters for QO-STBC with square QAM constellation have been derived analytically. The optimised QO-STBCs with GCLT are able to achieve full-transmit diversity and have negligible performance loss compared with QO-STBCs with CR at the same code rate

Keywords

algebraic codes; block codes; maximum likelihood decoding; modulation coding; orthogonal codes; quadrature amplitude modulation; space-time codes; GCLT; QO-STBC; diversity optimisation; generic algebraic structure; group-constrained linear transformation; maximum-likelihood decoding complexity; quasiorthogonal space-time block code; rectangular QAM constellations;

fLanguage

English

Journal_Title

Communications, IET

Publisher

iet

ISSN

1751-8628

Type

jour

DOI

10.1049/iet-com:20050438

Filename

4247320