An Efficient Maximum-Likelihood Detector for Four-Transmit-Antenna Quasi-Orthogonal Space-Time Block Code

Hyounkuk KIM  Hyuncheol PARK  

IEICE TRANSACTIONS on Communications   Vol.E91-B   No.2   pp.666-668
Publication Date: 2008/02/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e91-b.2.666
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
quasi-orthogonal space-time block code,  maximum-likelihood detection,  sphere decoding,  

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This letter deals with computationally efficient maximum-likelihood (ML) detection for the quasi-orthogonal space-time block code (QOSTBC) with four transmit antennas. The proposed ML detector uses a permutation based real-valued equivalent channel matrix representation. As a result, the complexity of ML detection problem is moderated from O(2|A|2) to O(4|A|), where |A| is modulation order. Numerical results show that the proposed ML detector provides ML performance and achieves greatly high computational savings.