中文摘要：

针对STBC-OFDM信号盲识别中存在着识别所需样本数多、对频偏敏感和不适用于单接收天线等问题,提出一种基于FOLP（Fourth Order Lag Product）的识别方法.根据不同空时分组码元素的相关性,推导了接收信号的FOLP,构造了基于FOLP的峰值检测算法.推导和仿真结果表明,该算法能够在单接收天线下运行,且不需要知道信道信息、噪声信息、调制信息以及OFDM块的起始位置;且该算法不受调制方式的影响,对时延、相位噪声和频率偏移鲁棒性能好,能够应用于认知无线电、频谱监控等工程领域中.

英文摘要：

Aiming at the problems that the former recognition algorithms for STBC-OFDM（ Space-Time Block Code with Orthogonal Frequency Division Multiplexing） need too many received symbols,sensitive to frequency offset and not suitable for single received antenna,a method based on the fourth order lag product（ FOLP） is proposed. According to the correlation between received STBC symbols,the FOLP of received signals is deduced,and a peak test algorithm is proposed to identify the STBCs. Unlike other methods,this algorithm does not require any prior information of channel coefficients,noise information,modulation type and start of OFDMblock and,is well-suited for single received antenna context. The proposed method provides a good performance with lowsensitivity to impairments in the received signals,such as time offset,phase noise and frequency offset. It can be applied in cognitive radio systems,spectrum surveillance,and so on.