一种新的TDCS自适应门限设置方法及性能分析

发布时间：2018-05-20 22:11

  本文选题：变换域通信系统 + 自适应门限　； 参考：《军械工程学院学报》2015年01期

【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.
[Abstract]:In order to improve the anti-jamming performance of transform domain communication system in complex multi-variable electromagnetic environment, a new adaptive threshold setting method for TDCS is proposed. The detection probability and false alarm probability of the system are considered by setting the weight factor. The threshold optimization function is established and the expression of the optimal threshold value is obtained. The threshold is determined by the interference signal power, noise power and weight factor, and can be adjusted adaptively with the change of the ambient dry noise ratio. Theoretical analysis and simulation results show that the proposed method can accurately locate the interference and eliminate it under the coexistence of multi-tone interference and narrowband interference, and then generate the base function amplitude spectrum which is almost pure without interference. The bit error rate of TDCS system is reduced, and the anti-interference performance of the system is improved.
【作者单位】： 军械工程学院无人机工程系;
【分类号】：TN973
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本文编号：1916446