任意中频带通信号多相数字下变频方法

POLYPHASE BASED DIGITAL DOWNCONVERTION OF RANDOM IF SIGNALS

基于多相结构的数字下变频方法由于其可实现性强,抗干扰能力强等优点,在电子系统软件化的趋势中得到越来越多的重视。其缺点是存在信号接收盲区。该文在多相滤波数字下变频方法的基础之上,提出了一种改进方法。该方法在不改变原有下变频器结构的前提下,实现监视带内任意中频位置带通信号接收,消除接收盲区。

Polyphase based digital downconvertion is widely used in software electronic system design because it is easy to be realized and also has anti-jamming ability. But this method has blind frequency zone. This paper proposes a new method based on polyphase digital downconvertion which can eliminate the blind frequency zone and realize the receiving of any IF bandpass signal without changing the structure.