高效非均匀数字信道化及信号重建技术

Efficient Non-uniform Digital Channelizer and Signal Reconstruction Technology

针对宽带接收机接收信号多,且信号在频谱上呈现非均匀分布的情况,提出了基于多相离散傅里叶变换(DFT)滤波器组和信号重建的高效非均匀数字信道化的设计方法。该数字信道化结构由分析和综合两部分组成,采用同一组原型滤波器系数,通过对原型低通滤波器的优化设计提高其带外衰减性能,以利用平行结构正交镜像滤波器组重建信号。与常用的并行数字下变频、多级多相DFT滤波器组两种非均匀数字信道化方法运算量比较,该方法在信号重建失真很小的情况下具有高效性和可行性。

In view of the situation that the number of receiving signal in wideband receiver is large and signal spectrum distributes non-uniformly, a method of efficient non-uniform digital channelizer based on polyphase filter banks and signal reconstruction is proposed in this paper. The digital channelizer is composed of both analyser and synthesizer with a same coefficient of prototype low-pass filter, which is designed optimally to achieve high stopband attenuation, so that the parallel quadrature mirror filter banks can be used to reconstruct signal. Finally, the computational complexity of the proposed channelizer is compared with that of the parallel digital down conversion channelizer and multi-stage polyphase DFT（Discret Fourier Transform） filter banks, it can be seen that the proposed method is more efficient and feasible with a little signal distortion.