Title :
A Study on Influencing Factors for the Output Signal-to-Noise Ratio of FFT Processor and Its Utilization
Author :
Gao, Zhenbin ; Wang, Xia ; Chang, Bin
Author_Institution :
Sch. of Inf. Eng., Hebei Univ. of Technol., Tianjin
Abstract :
The influencing factors on the output signal-to-noise ratio (SNR) of FFT processor are studied and a novel method to select the optimal word length for FFT processors is proposed. Taking fixed-point FFT as example, the expressions of showing the influence of input SNR, word-length, and FFT size on the output SNR have been given. Based on the relationship between the SNR of input sequence and the one of output sequence, the minimal word-length selection criterion for FFT processors is derived. The expressions are confirmed by experiment results and the word-length selection criterion is of great importance in designing FFT processors
Keywords :
fast Fourier transforms; signal processing; FFT processor; SNR; fixed-point FFT; output signal-to-noise ratio; word-length selection criterion; Additive noise; Discrete Fourier transforms; Equations; Frequency; Process design; Quantization; Roundoff errors; Signal processing; Signal to noise ratio; White noise;
Conference_Titel :
Signal Processing, 2006 8th International Conference on
Conference_Location :
Beijing
Print_ISBN :
0-7803-9736-3
Electronic_ISBN :
0-7803-9736-3
DOI :
10.1109/ICOSP.2006.344465
