一种新的TDCS自适应门限设置方法及性能分析  

A New Method of TDCS Adaptive Threshold Setting and the Analysis of its Performance

作　　者：周子栋[1] 陈自力[1] 姚安[1] 

机构地区：[1]军械工程学院无人机工程系,河北石家庄050003

出　　处：《军械工程学院学报》2015年第1期58-62,共5页Journal of Ordnance Engineering College

摘　　要：为了提高变换域通信系统(transform domain communication system,TDCS)在复杂多变电磁环境下的抗干扰性能,提出了一种新的TDCS自适应门限设置方法,通过设置权重因子考虑系统的检测概率和虚警概率,建立门限优化函数并求得最优门限值表达式.该门限值由干扰信号功率、噪声功率以及权重因子共同决定,能够随着环境干噪比的变化进行自适应调整.理论分析和仿真实验证明,在多音干扰和窄带干扰共存的信道环境下,该方法能够准确定位干扰并将其剔除,进而生成近乎纯净无干扰的基函数幅度谱,降低了TDCS系统的误码率,提高了系统的抗干扰性能.To improve the anti-jamming performance of the Transform Domain Communication System （TDCS） in the complex and variable electromagnetic environment, a new method of TDCS adaptive threshold setting is proposed. This method gives a trade-off analysis of the system＇s probability of detection and the probability of false alarm by setting the weighting factors.The threshold optimization function is built and the expression of the optimal threshold is deduced.The threshold is determined by the weighting factors and the power of interference and noise,which can adaptively adjust its value according to the change of the channel environment. Theoretical analysis and simulations show that this method can correctly locate and eliminate the interference.The amplitude spectrum of basic function is generated with almost no interference after interference elimination. The TDCS＇s BER is reduced and its anti-jamming performance is improved.

关 键 词：变换域通信系统 自适应门限 检测概率 虚警概率 抗干扰 

分 类 号：TN92[电子电信—通信与信息系统]