A V-BLAST System Using Modulation Set Selection for Reduced-Complexity Tree Searching in the QRD-M Algorithm

Hyounkuk KIM
Kihwan JEON
Joonhyuk KANG
Hyuncheol PARK

IEICE TRANSACTIONS on Communications   Vol.E90-B    No.12    pp.3665-3669
Publication Date: 2007/12/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e90-b.12.3665
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Transmission Systems and Transmission Equipment for Communications
vertical Bell Labs layered space-time (V-BLAST),  sphere decoding (SD) algorithm,  QRD-M algorithm,  

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This letter presents a new vertical Bell Labs layered space-time (V-BLAST) transmission scheme for developing low-complexity tree searching in the QRD-M algorithm. In the new V-BLAST system, we assign modulation scheme in ascending order from top to bottom tree branches. The modulation set to be assigned is decided by two criteria: minimum performance loss and maximum complexity reduction. We also propose an open-loop power allocation algorithm to surmount the performance loss. Numerical results show that the proposed V-BLAST transmission approach can significantly reduce the computational loads of the QRD-M algorithm with a slight performance degradation.