高效的无盲区非均匀信道化滤波结构的设计与分析

The Design and Analysis of an Efficient Non-uniform Channelized Filter Structure without Blind Area

加权重叠相加(WOLA)滤波器组是实现信道化滤波的一种高效结构。在其设计过程中需要知道子带信号的数量、位置、带宽等先验信息,故其设计灵活性差,不可重置,不能实现信号的非均匀信道化接收。该文在WOLA法的基础上通过邻近信道合并提出了一种无盲区非均匀信道化滤波结构。仿真结果证明该方法实现了任意位置、任意带宽、任意数量子带信号的无盲区非均匀信道化滤波。该方法在实现过程中参数设计简单、计算复杂度低、硬件实现效率高。不需要知道子带信号的任何先验信息,设计灵活性较高、可重置性强。同时通过改变抽取因子还可以控制输出子带信号的采样率,增强了信号的输出灵活性。

The weighted overlap-add filter bank is an efficient structure to realize the channelized filter. However when it is realizing,the prior information of the subband singles,such as the quantity,the location,the bandwidth and so on are need to be knew. So it can＇ t be designed flexibly,be reutilized,and realize the non-uniform channel filter. In this paper,a non-uniform channel filter structure based on the WOLA filter-banks is presented using the combination of the adjacent channel. Computer simulation illustrates that the structure utilizing fully the advantages of the WOLA filter-banks can achieves the channel receiving of the subband signal with any position,any bandwidth and any quantity. During the realization process of the structure,the computational complexity is low and the efficiency of hardware implementation is high. Because of not needing to know the prior information of the signal,the design flexibility is high and the replacement is allowable. At the same time the subband signal sampling rate can be regulated by the changing of the extraction factor which enhances the flexibility of the output signal.