基于旋转因子的差分酉空时分组码

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。

Design and Performance of Rotated Differential Unitary Space-Time Block Codes

Based on two sets of quasi-orthogonal space-time block codes from TBH and Jafarkhani encoding schemes,this paper presents four unitary matrices constructed from the auto-adapted rotated angle factors.This approach enlarges the Euclidean distance of codes without expansion of the signal constellation.Moreover,at the received part,based on the angle operator,a simplified decoding method in pairs decoding could be implemented.The simulation results show that the proposed schemes,although with added complexity,has better performance than other differential unitary space-time codes without angle rotated factor.