扩频通信中多个宽带Chirp干扰的识别与抑制  

Multi-chirps interference identification and excision in direct sequence spread spectrum communications

作　　者：于凤芹[1] 曹家麟[2] 屈百达[1] 

机构地区：[1]江南大学通信与控制工程学院,江苏无锡214122 [2]上海大学机械电子与自动化学院,上海200072

出　　处：《辽宁工程技术大学学报（自然科学版）》2005年第4期570-572,共3页Journal of Liaoning Technical University (Natural Science)

基　　金：江苏省自然科学基金资助项目(BK2002068)

摘　　要：根据宽带Chirp干扰信号在与其调频斜率一致的分数阶傅里叶变换域呈现冲激函数特征,对接收的信号进行连续阶数的分数阶傅里叶变换,在适当的阈值下搜索并剔除其局部极大值后再进行反变换,从而对直接序列扩频通信系统中多个宽带Chirp干扰逐一识别和剔除,该方法计算量适中,且对干扰的强弱有较大的适应范围,仿真实验结果证明了这种方法的有效性。Based on the impulse characteristic presenting the Chirp jamming in the FRFT domain, the identification and excision for the multi-chirps jamming in DSSS communications system is proposed, which implements FRFT for received signal and then searches and eliminates the local maximum above a threshold, and then makes invert FRFF so that the interference is identified and removed one by one. This method has moderate computation and adaptability to interference bound. The simulation results have shown the validity of the proposed method.

关 键 词：多个宽带Chirp干扰 干扰抑制 分数阶傅里叶变换 直接序列扩频通信 矿井通信 

分 类 号：TN911.7[电子电信—通信与信息系统]