摘要
宽带数字接收机通常会面临接收带宽内存在多个信号,且信号带宽,位置以及个数对侦察这一端来说都是未知的,在现代电子战中,信号为了躲避侦察,往往还具有时变性。针对这种情况,提出了基于多相滤波的高效动态数字信道化设计方法。首先设计原型滤波器,使其具有高的阻带衰减,以便减少相邻滤波器之间的混叠;然后基于多相结构设计分析滤波器组和综合滤波器组,在完成信号检测后,将含有相应信号信息的信道数据送入相应的综合滤波器完成信号重构,当信号变化时,只需重新检测信号位置分布即可;最后通过将重构后的信号与原信号对比验证了滤波器组具有几乎完全重构特性,在有噪声的背景下,重构后能够显著地提高信噪比。
Wide-band Digital Receivers often face this situation： in the received bandwidth,there exits several sub-band signals,which have different bandwidths.Meanwhile,signals’ location and numbers are unknown to receivers.What is more,in modern electronic warfare,in order to avoid being detected,signals are time-varying.For this situation,a method of efficient and dynamic channelized receiver,which is based on poly-phase filter structure,is proposed.To begin with,a prototype filter is designed,which should have high stop band attenuation,to reduce aliasing between adjacent filters;Second,analysis filters are designed,after the completion of signal detection,locations of signals are attained,the corresponding synthesis filters are designed to extract desired signals.When signals are changed,it is only need to update the locations of signals by signal detection module.Finally,by the comparison between the reconstructed signals and original signals,it is verified that the filters have near-perfect-reconstruction;more importantly,in the background of noise,after the reconstruction,the SNR can be significantly improved.
出处
《电路与系统学报》
北大核心
2013年第2期1-5,共5页
Journal of Circuits and Systems
关键词
多相滤波
几乎完全重构
信噪比
数字信道化
poly-phase filters
near-perfect-reconstruction
SNR
channelized receiver
