在低信噪比情况下，提出了一种基于循环对角码的改进的酉空时码设计。
Based on cyclic diagonal codes, an improved design of unitary space-time codes (USTC) at low SNR is proposed.
鉴于酉空时码的独特结构，在差错概率公式中可以很容易地分析衰落相关系数矩阵带来的影响。
According to the special structure of unitary code, it is very simple to analyze the effect of fading correlation from the equation of PWEP.
针对酉空时码最大似然检测复杂度高的问题，提出了一种酉空时星座的设计及低复杂度译码方法。
A decoding algorithm based on the tree-structured constellation design was presented in order to reduce the decoding complexity of unitary space-time codes.
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