单接收天线空时分组码系统的分层调制识别  

Hierarchical Modulation Classification of Space-Time Block Codes with a Single Receive Antenna

作　　者：凌青[1] 张立民[1] 闫文君[1] 邓向阳[1] 

机构地区：[1]海军航空工程学院信息融合所,山东烟台264001

出　　处：《电子学报》2016年第11期2802-2806,共5页Acta Electronica Sinica

基　　金：国家自然科学基金(No.61102167);泰山学者工程专项经费资助

摘　　要：针对单接收天线空时分组码系统的调制识别问题,提出了一种基于初等四阶累积量的分层调制盲识别算法.首先推导了不同信号星座在无噪声条件下的初等四阶累积量的理论值和方差,然后根据最大似然比检测求得阈值;最后比较接收信号初等四阶累积量实验值与阈值的大小盲识别调制方式.该算法不需要信道、噪声功率等先验信息,适合非合作通信场合.仿真结果表明,所提出的算法在低信噪比下能够较好的识别单接收天线空时分组码调制方式.A method for blind classification of Space-Time Block Codes （STBCs） with a single receive antenna based on elementary fourth-order cumulants is proposed. Firstly, the theoretical values and variance of various signal constel- lations were obtained by computing the ensemble averages over the ideal noise-free constellation. And then the thresholds were gained by the likelihood ratio test （LRT） for the tests in the hierachical classification scheme. Finally,the automatic classification of modulation scheme was realized by comparing the experimental values and the thresholds. Furthermore, un- like other methods, this algorithm does not require any prior information of the channel coefficients, and noise power and, consequently, is well-suited for non-cooperative context. The simulation shows that the proposed algorithm performs well e- ven at a low signal to noise ratio （SNR）.

关 键 词：空时分组码 调制识别 单接收天线 初等四阶累积量 

分 类 号：TN911.7[电子电信—通信与信息系统]