基于频域插值的信道化原型滤波器设计

发布时间：2018-03-10 05:26

本文选题：信道化　切入点：原型滤波器　出处：《现代雷达》2017年07期 　论文类型：期刊论文

【摘要】：针对信道化原型滤波器设计复杂度较高的问题,提出一种满足线性相位要求的原型滤波器频域插值设计算法。该算法采用无约束迭代优化办法获得了阻带衰减较高的低阶滤波器模型,然后根据所推导的频域插值模型构建满足线性相位特性的原型滤波器频谱,最后通过快速傅里叶逆变换获得了满足信道化滤波器组完全重构特性要求的原型滤波器。所提设计算法将频域插值与迭代优化相结合,有效地解决了设计高阻带衰减的原型滤波器时待优化参数数目较大的问题,并且不会产生镜像频谱,省去了镜像抑制滤波器的设计。仿真结果表明,所提算法相比传统的时域插值设计算法具有显著的性能改善,并且降低了设计复杂度。
[Abstract]:Aiming at the problem of high design complexity of channelized prototype filter, A frequency domain interpolation design algorithm for prototype filters satisfying the linear phase requirements is proposed. The low order filter model with high stopband attenuation is obtained by using the unconstrained iterative optimization method. Then, according to the derived frequency domain interpolation model, the spectrum of the prototype filter satisfying the linear phase characteristic is constructed. Finally, a prototype filter satisfying the requirement of complete reconstruction of channelized filter banks is obtained by inverse FFT. The proposed algorithm combines frequency domain interpolation with iterative optimization. The problem of large number of parameters to be optimized in designing the prototype filter with high stopband attenuation is effectively solved, and the mirror spectrum is not generated, thus the design of the mirror suppression filter is eliminated. The simulation results show that, Compared with the traditional time domain interpolation algorithm, the proposed algorithm has significant performance improvement and reduces the design complexity.
【作者单位】：解放军理工大学通信工程学院;南京熊猫汉达科技有限公司;
【基金】：江苏省自然科学基金资助项目(BR20141069)
【分类号】：TN713

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