基于可变带宽EFT滤波器的带宽匹配数字接收方法  

Bandwidth-Matched Digital Receiving Method Based on Variable-Bandwidth EFT Filter

作　　者：吴伟[1] 唐斌[1] 

机构地区：[1]电子科技大学电子工程学院,成都610054

出　　处：《电子与信息学报》2008年第11期2728-2731,共4页Journal of Electronics & Information Technology

基　　金：国家部级基金资助课题

摘　　要：该文提出了一种新的基于可变带宽EFT滤波器的带宽匹配数字接收方法。文中利用线性准时不变(LQTI)系统在扩展傅里叶变换(EFT)域的可变带宽频率特性来构建可变带宽滤波器(VBF),并将可变带宽EFT滤波器引入数字下变频(DDC),实现对不同带宽信号的匹配接收。应用这种滤波器的优点在于只有一个直接决定带宽的可调谱参数,更新机制简单。文中还进一步给出带宽匹配接收数字下变频的多相高效结构,运算效率和工程可实现性大大提高。实验结果证明了该方法的正确性和有效性。This paper proposes a novel bandwidth-matched digital receiving method based on the variablebandwidth EFT filter. The variable-bandwidth frequency characteristics of the Linear Quasi-Time-Invariant （LQTI） system in Extended Fourier Transform （EFT） frequency domain are used for constructing the Variable-Bandwidth Filter （VBF）. By using the variable-bandwidth EFT filter, the Digital DownConversion （DDC） can correctly receive the signals with different bandwidth. Based on a simple updating routine, the proposed variable-bandwidth filter can considerably reduce the complexity during normal operations. It is proposed that the efficient polyphase structure of bandwidth-matched digital downconversion and a significant improvement in efficiency and realizability can be achieved. Finally, the experimental results show the correctness and validity of the method.

关 键 词：扩展傅里叶变换 线性准时不变系统 可变带宽滤波器 带宽匹配接收 多相结构 

分 类 号：TN957[电子电信—信号与信息处理] TN911.72[电子电信—信息与通信工程]