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Quasi-Orthogonal STBC System Using Unequal Power Allocation Scheme Yeon Ju LIM Bong Jun KIM Sang Kyu PARK Publication IEICE TRANSACTIONS on Communications Vol.E89-B No.9 pp.2633-2637 Publication Date: 2006/09/01 Online ISSN: 1745-1345 DOI: 10.1093/ietcom/e89-b.9.2633 Print ISSN: 0916-8516 Type of Manuscript: LETTER Category: Wireless Communication Technologies Keyword: quasi-orthogonal, STBC, transmit antenna, power allocation, Full Text: PDF(172KB)>>
Summary: Quasi-orthogonal Space Time Block Code (STBC) was designed to provide full transmission rate when using more than two antennas. However, it cannot have a full diversity gain because of the interference resulted from its quasi orthogonality property. In order to achieve full diversity from quasi-orthogonal STBC, the interference can be removed by a Simple Correlation Canceling (SCC) algorithm which improves a system performance significantly. However, the SCC algorithm has a disadvantage that produces noise enhancement, thereby resulting in performance degradation. Accordingly, without increasing an extra system complexity, an unequal power allocation scheme in a transmitter is proposed to achieve a better system performance than the conventional STBC system using the SCC algorithm. Also, the unequal power allocation scheme enables a receiver to use a simple decoding procedure that does not produce noise enhancement. | |||||
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