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基于TBH和Jafarkhan编码方案的两组准正交空时分组码,引入自适应旋转因子构造出四种差分调制酉矩阵,该方法不仅没有带来星座扩展,还使新的码字具有较大的欧氏距离。同时在接收端基于角度算子,形成了简化的成对译码方法。仿真结果表明:尽管此设计方法增加了一定的复杂度,但它比没有加入旋转因子的差分酉空时分组码具有更好的误码性能。
Based on the two groups of quasi-orthogonal space-time block codes based on TBH and Jafarkhan coding schemes, four differential modulation unitary matrices are constructed by introducing an adaptive rotation factor. This method not only does not bring constellation expansion, but also makes the new code words have larger Euclidean distance. At the same time based on the angle of the receiver operator, forming a simplified paired decoding method. The simulation results show that although this design method adds a certain degree of complexity, it has better error performance than the differential unitary space-time block code without the addition of twiddle factor.