基于两级信道化的宽带数字接收机结构

Architecture of wideband digital receiver based on two-level channelization

通过无盲区的均匀信道划分,研究了一种基于两级数字信道化的高效宽带数字信道化接收机结构。该结构的一级信道化采用奇偶两路并行结构,对整个接收机瞬时带宽进行粗划分,并配合有效的信道检测机制实现对当前输入信号所在接收机分析带宽的准确定位,同时适合对大带宽信号的接收;二级信道化对一级信道化的子信道带宽进行细划分,提高了信道的频率分辨率,实现了多信号的频域分离,适合对窄带信号的接收。本结构实现了频率的多分辨,在满足同一频率分辨率时较单级信道化结构所需要的总信道数小,且降低了滤波器的阶数和设计难度,适合硬件实现。

In this paper,an approach is studied to realize a high-performance wideband digital receiver based on two-level channelization through uniform channel division without blind zone.The proposed architecture has two different channelizaion.The former,suitable for receiving broadband signals,which takes advantage of even and odd channel in parallel with an efficient channel detection mechanism,allows coarse division towards the whole instantaneous bandwidth of the receiver to pinpoint the analysis bandwidth in which the current input signal exists.Successively,the further division of sub-channel of the former is achieved in the latter,which is suitable for the to narrow-band signals improves the frequency resolution of each channel and the separation of multi-signal in frequency domain as well.The proposed architecture,implementing the multi-resolution in frequency zone,needs less number of total channels with the reducing the design difficulty.The simulation result illustrated the validity of the architechure.