WOLA滤波器组信道化接收机技术
Channelized Receiver with WOLA Filterbanks
-
摘要: 多相DFT滤波器组是实现信道化接收机的一种高效结构,但是该结构要求信道数目与抽取倍数必须相等,限制了接收机参数设计的灵活性。该文将WOLA滤波器组引入信道化接收机,以信号的平移代替窗函数的平移,对加权、叠接、相加后的信号进行DFT变换,实现了多相DFT滤波器组的相同功能,又解除了抽取倍数与信道数目的约束关系,是多相DFT滤波器组的一种推广形式。仿真结果验证了WOLA滤波器组在实现信道化接收机时的有效性。Abstract: Polyphase discrete Fourier transform (PDFT) filterbank is an efficient structure for channelized receiver, but its flexibility is limited by the fixed relationship between decimating factor and channel number. In this paper, a flexible and efficient channelized receiver structure is proposed with weighted overlap-add filterbanks. The shift of window is replaced by the shift of input signals. DFT is employed after weighting, overlapping, and adding. The structure gets rid of the fixed relationship in PDFT structure, but realizes same functions. So the proposed structure is a generalized form of PDFT structures. The simulation results show the effectiveness of the new structures.