Dynamic Twiddle Factors Split-Radix Fast Fourier Transform for Monobit Receivers

This paper gives a new method to replace the discrete Fourier transform (DFT) for monobit receivers by using dynamic twiddle factors based on the split-radix fast Fourier transform (SRFFT) to optimize performance of monobit receivers. Two main advantages from this method can be concluded as: a. Simplify the design and calculation. b. Improve spurious-free dynamic range. From the results of the experiments in this paper, the spurious-free dynamic range of the proposed algorithm can be optimal when the number of effective bits of input signals and SNR are determined. The results are presented by simulating a 4-bit ADC with 2.5 GHz sampling rate and 1024-point SRFFT.