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arXiv 0806.3325cs.ITmath.IT
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高速率准正交空时分组码的研究

On the Search for High-Rate Quasi-Orthogonal Space-Time Block Code

Chau Yuen, Yong Liang Guan, Tjeng Thiang Tjhung

摘要:

准正交空时分组码(QO-STBC)具有比正交空时分组码更高的编码速率和比非正交空时分组码更低的译码复杂度。本文首先推导了QO-STBC的代数结构,然后将其应用于一种新的基于图的搜索算法中,以找到码率大于1的高速率QO-STBC。从使用这种方法发现的四天线码,它被发现,最大码率被限制为5/4与符号分集水平为4,和4与符号分集水平为2。这些高速率QO-STBC的最大似然解码可以在两个单独的符号子组上执行。码率为5/4的码是第一种已知的具有全符号分集水平的码率大于1的QO-STBC。

英文摘要:

A Quasi-Orthogonal Space-Time Block Code (QO-STBC) is attractive because it achieves higher code rate than Orthogonal STBC and lower decoding complexity than nonorthogonal STBC. In this paper, we first derive the algebraic structure of QO-STBC, then we apply it in a novel graph-based search algorithm to find high-rate QO-STBCs with code rates greater than 1. From the four-antenna codes found using this approach, it is found that the maximum code rate is limited to 5/4 with symbolwise diversity level of four, and 4 with symbolwise diversity level of two. The maximum likelihood decoding of these high-rate QO-STBCs can be performed on two separate sub-groups of symbols. The rate-5/4 codes are the first known QO-STBCs with code rate greater 1 that has full symbolwise diversity level.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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