基于频域互相关序列与峰值检测的空频分组码盲识别算法

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针对复杂电磁环境和非协作通信条件下空频分组码(space-frequency block codes,SFBC)信号识别困难、对先验信息要求高的问题,提出一种基于频域互相关序列与峰值检测的SFBC盲识别方法.首先,通过分析SFBC信号的编码特点,计算得到发送端的互相关函数.然后,考虑频率选择信道、多径传播和噪声的影响,推导了接收信号的互相关函数,并对其进行傅里叶变换得到频域互相关序列.最后,根据频域互相关序列检测其峰值位置识别发射端编码方式.推导和实验结果表明,该算法在低信噪比下的识别性能较好,并且对时间偏差和频率偏差等情况的适应性较强,在复杂电磁环境下具有较好的识别性能,能够应用在认知无线电和频谱检测等场合.该算法不需要知道信道和噪声的先验信息、正交频分复用(orthogonal frequency division multiplexing,OFDM)块大小以及接收端和发射端的同步信息,非常适合于电子侦察等非协作通信场合.
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