Frequency-Based Optimization Design for Fractional Delay FIR Filters with Software-Defined Radio Applications

Table 1

Comparison of approximation errors for several methods.

Methods	𝑒max (dBs)	𝑒rms
WLS design [19]	−100.0088	2.9107×10^−6
Improved WLS [24]	−100.7215	2.7706×10^−6
Discretization-free [20]	−99.9208	4.931×10^−4
Variable Factional Delay [21]	−99.3669	2.8119×10^−6
	−100.9278	2.8497×10^−6
Direct Taylor approximation [18]	−93.69	4.81×10^−4
Proposed method	−86.17	2.78×10^−4