Rate-One Full-Diversity Quasi-Orthogonal STBCs with Low Decoding Complexity

Minh-Tuan LE
Linh MAI
Giwan YOON

IEICE TRANSACTIONS on Communications   Vol.E89-B    No.12    pp.3376-3385
Publication Date: 2006/12/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e89-b.12.3376
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
space-time coding,  multiple-input multiple-output,  maximum likelihood detection,  diversity,  wireless communication,  

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This paper presents a family of rate-one quasi-orthogonal space-time block codes (QO-STBCs) for any number of transmit antennas. Full diversity of the proposed QO-STBCs is achieved via the use of constellation rotation. When the number of transmit antennas is even, these codes are delay "optimal." This property along with the quasi-orthogonality one allows the codes to have low decoding complexity. Besides, by applying lookup tables into the detection methods presented in [1] and generalizing them, two low-complexity maximum-likelihood (ML) decoders for the proposed QO-STBCs and for other existing QO-STBCs, called PMLD and QMLD, are obtained. Simulation results are provided to verify the bit error rate (BER) performances and complexities of both the proposed QO-STBCs and the proposed decoders.