高鲁棒性格型无限脉冲响应数字滤波器结构设计

摘要

A novel lattice filter structure is derived for infinite impulse response（IIR） digital filters with low complexity and high robustness against finite-word-length effects. For an N-th order filter, there are 2N nodes for the input signals to select to minimize the signal power ratio. The new structure using the one-multiplier elementary lattice possesses only （2N ＋ 1） multipliers. Compared with traditional lattice structures in simulation, the proposed structure not only has fewer multipliers, but also yields much smaller signal power ratio.%针对如何设计低复杂度并对有限字长效应具有高鲁棒性的滤波器结构问题，提出了一种新型的格型无限脉冲响应（IIR）数字滤波器结构．对于一个N阶滤波器，该结构具有2N个不同的位置供输入信号选择注入．通过选择不同的位置进行注入使滤波器结构的信号功率比最小．当采用单乘法器格型单元时，提出的新结构只需2N＋1个乘法器便能实现一个N阶IIR滤波器．仿真结果表明，与传统的格型滤波器结构相比，新结构不仅需要更少的乘法器，而且具有更小的信号功率比．