数字卫星通信系统中共信道窄带干扰检测的FFT方法  

An FFT Narrow-Band Interference Detection Scheme in Digital Satellite Communication Systems

作　　者：吴珺[1] 胡光锐[1] 孙丽萍[1] 

机构地区：[1]上海交通大学电子工程系,上海200030

出　　处：《上海交通大学学报》2003年第10期1600-1602,共3页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金资助项目(60172018)

摘　　要：在对数字卫星通信系统中存在共信道窄带干扰进行分析的基础上,以多个FDMA-DQP-SK信号组成的共信道窄带干扰作为实例,建立了干扰的数学模型,并结合项目自身的特点提出了FFT干扰检测算法.该算法对传统干扰检测算法的能量门限选择、干扰带宽计算等方面进行了改进,新算法的检测结果作为陷波器设计的主要参数.根据这些参数设计的陷波器仿真干扰抑制,得到了比较满意的效果.将陷波器的仿真输出结果与传统方法设计的陷波器仿真输出结果进行了比较,充分显示了新方法的可行性和优越性.This paper analysed the narrowband interference in the satellite communication systems. Under the background of the project——Signal Interference Suppression in digital satellite communication systems, it built a mathematic model and proposed a new interference detection algorithm, FFT interference detection, in order to suppress the narrowband interference in the FDMADQPSK channel. Compared with the traditional algorithm, the new one improves the power threshold, interference bandwidth calculation.The detection results were used to design a notch filter, which is applied to suppress the narrowband interference in the simulation system, resulting in a satisfactory output. Comparison of the output of the notch filter between the two algorithms demonstrates the feasibility and priority of the new one.

关 键 词：数字卫星通信系统 差分正交相移键控 共信道干扰 快速傅里叶干扰检测 

分 类 号：TN914.4[电子电信—通信与信息系统]