针对全盲条件下正交空时分组码（OSTBC）的正交性识别问题，提出一种基于高阶累积量的OSTBC识别方法。通过对接收信号白化，在不需要信道估计的情况下，消除信道对识别结果的干扰，既减少了算法复杂度，又提高了低信噪比条件下 OSTBC 的识别概率；考虑实际系统中噪声对识别结果的影响，利用高阶累积量（阶数大于2）的去噪声特性，消除噪声对于 STBC 正交特性识别的影响；分析了两种四阶累积量的 OSTBC 识别特性，选取了适用于OSTBC 识别的四阶累积量作为特征参数。仿真结果表明，所提出方法对于 OSTBC 识别问题区分性能较好。%A simple method,based on higher-order cumulants,is proposed for the recognition of Orthogonal Space-time Block Code (STBC).Considering the impact of channel,we propose a method of signals whitening without estimating the channel state information.This method eliminates the channel interference for the recognition.It not only reduces the complexity of the algorithm,but also improves recognition probability ratio of Orthogonal STBC in low SNR.We use high-er-order cumulants (of order greater than 2)to eliminate the impact of noise.We analyze the two fourth-order cumulants, and select the more suitable fourth-order cumulants as Characteristic parameters for the recognition.Simulation results show that the proposed method for blind recognition of Orthogonal STBC has good performance.
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