矿井通信中酉空时调制信号的高阶统计特性识别  

Unitary space-time modulation signals recognition in mine communication based on high order statistics

作　　者：张丽[1] 张大鹏 张扬[1,3] 

机构地区：[1]河南理工大学计算机科学与技术学院 [2]空军95883部队 [3]空军第一航空学院航空电子工程系

出　　处：《中国矿业大学学报》2015年第5期959-964,共6页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(61340014;61340015)

摘　　要：多天线系统的酉空时调制(USTM)技术能够在矿井通信中提供可观的分集增益,且无需信道估计,具有良好的抗衰落能力,但目前尚未见有效的识别方法.针对矿井通信的特点,根据酉空时调制的特殊性,利用随机矩阵的特征函数,提出与之适应的高阶联合矩和高阶联合累积量算法;依据高阶联合统计量的差异,分别在单天线和多天线系统中实现了USTM信号与相移键控信号(MPSK)及垂直分层空时码信号(V-BLAST)的分离,从而完成了对酉空时调制信号的调制识别.结果表明:所提取的特征参数在矿井通信中对噪声有很好的抑制作用,算法简单,易于实现,而且在低信噪比下依然有很好的识别率,能有效提高矿井通信数据传输能力和可靠性.Unitary space-time modulation（USTM）can provide considerable diversity gain without channel state information,and therefore has good capacity against fading ability.However,there is little study on effective modulation recognition in mine communication.Based on the features of mine communication and particularity of USTM signal identification,a high order statistics calculation method of USTM is proposed,by employing the characteristic function of random matrix.The joint high order statistics is extracted and applied to single-antenna and multi-antenna systems to distinguish USTM signals from V-BLAST and MPSK signals,so that the proposed algorithm can realize the modulation recognition of USTM signals in mine communication.Simulation results and performance indicate that the extracted characteristic parameters have obvious inhibiting effect on noises in mine communication channels and have good recognition rate even with low signal to noise ratio.The algorithm is simple and can effectively improve data transmission and its reliability in mine communication.

关 键 词：调制识别 高阶统计量 酉空时调制 

分 类 号：TN911.72[电子电信—通信与信息系统]