Two-dimensional non-recursive design method of low-cost FIR filter [二维非递归的低成本FIR滤波器设计方法]

作者：Zhong Y.; Yan Y.^*; Meng Z.; Tian Y.; Liu M.; Li J.

来源：Journal of Harbin Institute of Technology, 2021, 53(6): 171-176 and 191.

DOI：10.11918/201910089

• Coefficient matrix
• Logic adder number
• Logic depth
• Low-cost FIR filter
• Non-recursive
• Redundant terms

To reduce the overall hardware cost as well as improve the synthesizability of finite impulse response (FIR) filter, a two-dimensional non-recursive optimization algorithm based on coefficient matrix was proposed and simulated. Firstly, the existing digital filter optimization algorithms were investigated, and the advantages and shortcomings of these algorithms were compared and analyzed. Then, efforts were made to optimize the existing one-dimensional non-recursive algorithm. By extracting the redundant terms of one-dimensional non-recursive optimization algorithm, a novel two-dimensional non-recursive FIR optimization method with low computing complexity was obtained. Finally, multiple groups of filters were generated to simulate and compare the performance between the proposed algorithm and one-dimensional non-recursive algorithm as well as the existing recursive algorithms. Simulation results show that the two-dimensional non-recursive FIR filter design method proposed in this paper makes full use of the redundant information of the coefficient matrix, keeps the character of minimum logic depth, and meanwhile reduces logic adder number. Compared with the existing one-dimensional non-recursive algorithm, this algorithm saved logic adder by 10.05% (12 bit quantization) and 7.21% (16 bit quantization). In the design of low-order filter, the adder cost was reduced to 30% of the conventional CSD representation, which outperforms the existing recursive and non-recursive filter design methods in terms of logic depth and adder number.

• 单位
  中国科学院大学