WOLA滤波器组信道化接收机技术.pdfVIP

第37 卷 第1 期 电 子 科 技 大 学 学 报 Vol.37 No.1 2008 年1 月 Journal of University of Electronic Science and Technology of China Jan. 2008 WOLA滤波器组信道化接收机技术 王 洪，吕幼新，汪学刚 ( 电子科技大学电子工程学院 成都 610054) 【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。 关 键 词 信道化接收机; 多相DFT滤波器组; 短时傅里叶变换; WOLA滤波器组 中图分类号 TN 971.1 文献标识码 A Channelized Receiver with WOLA Filterbanks WANG Hong ，LÜ You-xin ，WANG Xue-gang (School of Electronic Engineering, University of Electronic Science and Technology of China Chengdu 610054) 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. Key words channelized receiver; polyphase DFT filterbanks; short-time Fourier transform; weighted overlap-add filterbanks 带通和低通滤波器组是实现信道化接收机的传 窄带信号进行处理，在电子战中实现宽带监视和窄 统结构，由于其计算量大、硬件实现效率低，已逐